{"id":2417,"date":"2025-09-05T06:20:24","date_gmt":"2025-09-05T06:20:24","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=2417"},"modified":"2025-09-26T07:15:27","modified_gmt":"2025-09-26T07:15:27","slug":"immersion-tin","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/szl\/pcb-manufacturer\/immersion-tin\/","title":{"rendered":"Immersion Tin"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"2417\" class=\"elementor elementor-2417\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a66c6dc e-flex e-con-boxed e-con e-parent\" data-id=\"a66c6dc\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e3844ef elementor-widget elementor-widget-text-editor\" data-id=\"e3844ef\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 data-start=\"48\" data-end=\"59\">Overview<\/h2><p data-start=\"60\" data-end=\"548\">Chemical tin plating, often called immersion tin, is a surface finish used for SMT and chip packaging. It deposits a tin metal layer on copper by a chemical reaction. It works well for high-density and high-precision boards. It also suits fine traces, narrow pads, and small pitch PCBs. This finish is a green process that can replace Pb-Sn alloy plating. The deposited tin layer has fine crystal structure, a silver-white look, a flat surface, good solderability, and stable performance.<\/p><p data-start=\"60\" data-end=\"548\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-2833\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Manual-Dip-Soldering.webp\" alt=\"Manual Dip Soldering\" width=\"353\" height=\"248\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Manual-Dip-Soldering.webp 353w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Manual-Dip-Soldering-300x211.webp 300w\" sizes=\"(max-width: 353px) 100vw, 353px\" \/><\/p><p data-start=\"550\" data-end=\"962\">The principle of chemical tin plating is to change the chemical potential of copper ions so that stannous ions in the bath undergo a displacement reaction. Reduced tin metal deposits on the copper surface to form a tin layer. Metal complexes that adsorb on the immersion tin surface help catalyze tin ion reduction. This keeps the reduction reaction going and ensures the tin layer grows to the needed thickness.<\/p><hr data-start=\"964\" data-end=\"967\" \/><h2 data-start=\"969\" data-end=\"986\">Main Functions<\/h2><ol data-start=\"988\" data-end=\"1710\"><li data-start=\"988\" data-end=\"1183\"><p data-start=\"991\" data-end=\"1183\"><strong data-start=\"991\" data-end=\"1016\">Protect copper traces<\/strong><br data-start=\"1016\" data-end=\"1019\" \/>Immersion tin forms a tin layer on copper traces. This layer protects copper from oxidation and corrosion. It helps extend the life of the printed circuit board.<\/p><\/li><li data-start=\"1185\" data-end=\"1365\"><p data-start=\"1188\" data-end=\"1365\"><strong data-start=\"1188\" data-end=\"1217\">Improve soldering quality<\/strong><br data-start=\"1217\" data-end=\"1220\" \/>The tin layer gives good soldering conditions. Solder joints become stronger and more reliable. This raises board performance and reliability.<\/p><\/li><li data-start=\"1367\" data-end=\"1570\"><p data-start=\"1370\" data-end=\"1570\"><strong data-start=\"1370\" data-end=\"1403\">Enhance electrical properties<\/strong><br data-start=\"1403\" data-end=\"1406\" \/>Tin can improve electrical performance. It can lower resistance and help with capacitance and inductance in some cases. This helps circuits run more efficiently.<\/p><\/li><li data-start=\"1572\" data-end=\"1710\"><p data-start=\"1575\" data-end=\"1710\"><strong data-start=\"1575\" data-end=\"1603\">Increase wear resistance<\/strong><br data-start=\"1603\" data-end=\"1606\" \/>Tin has decent wear resistance. It protects the board from damage caused by the external environment.<\/p><\/li><\/ol><p><img decoding=\"async\" class=\"alignnone size-full wp-image-2832\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/After-Dip-Soldering-the-backside-of-the-PCB.webp\" alt=\"After Dip Soldering the backside of the PCB\" width=\"355\" height=\"321\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/After-Dip-Soldering-the-backside-of-the-PCB.webp 355w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/After-Dip-Soldering-the-backside-of-the-PCB-300x271.webp 300w\" sizes=\"(max-width: 355px) 100vw, 355px\" \/><\/p><hr data-start=\"1712\" data-end=\"1715\" \/><h2 data-start=\"1717\" data-end=\"1741\">Application Scenarios<\/h2><p data-start=\"1742\" data-end=\"2073\">Immersion tin is low cost and simple to operate. It gives clear results. It is widely used in electronics that are cost sensitive and need reasonable soldering performance. Immersion tin also works for cases that need better environmental performance. Compared with immersion gold, immersion tin is more eco-friendly in many cases.<\/p><hr data-start=\"2075\" data-end=\"2078\" \/><h2 data-start=\"2080\" data-end=\"2144\">Difference Between PCB Spray Tin and Chemical (Immersion) Tin<\/h2><ul data-start=\"2146\" data-end=\"3507\"><li data-start=\"2146\" data-end=\"2262\"><p data-start=\"2148\" data-end=\"2262\"><strong data-start=\"2148\" data-end=\"2203\">Spray tin (PCB hot air solder leveling by spraying)<\/strong> costs a bit less. This method sprays tin only onto pads.<\/p><\/li><li data-start=\"2263\" data-end=\"2572\"><p data-start=\"2265\" data-end=\"2572\"><strong data-start=\"2265\" data-end=\"2297\">Chemical tin (immersion tin)<\/strong> deposits tin by chemical means on pad areas and includes the surface copper as well. It uses a thin tin layer, usually 10\u201330 \u00b5m, mainly to prevent oxidation and to improve SMT solder wetting. Its aim is the same as immersion gold or OSP. SMT requires the board to be tinned.<\/p><\/li><li data-start=\"2574\" data-end=\"2772\"><p data-start=\"2576\" data-end=\"2772\"><strong data-start=\"2576\" data-end=\"2589\">Spray tin<\/strong> uses physical methods to spray a layer of tin. The thickness is usually 50\u2013150 \u00b5m, which is thicker. For SMT, no extra tining is needed. Soldering parts with molten solder is enough.<\/p><\/li><li data-start=\"2774\" data-end=\"3003\"><p data-start=\"2776\" data-end=\"3003\">The compositions are different. <strong data-start=\"2808\" data-end=\"2824\">Chemical tin<\/strong> uses tin salts in an acidic tin-containing solution. <strong data-start=\"2878\" data-end=\"2891\">Spray tin<\/strong> usually uses tin alloys with lead or lead-free blends (pure tin is not used because of its high melting point).<\/p><\/li><li data-start=\"3005\" data-end=\"3202\"><p data-start=\"3007\" data-end=\"3202\"><strong data-start=\"3007\" data-end=\"3023\">Chemical tin<\/strong>, also called immersion tin, is a surface treatment for pad protection like OSP, immersion gold, and immersion silver. It mainly protects the surface copper foil at the pad sites.<\/p><\/li><li data-start=\"3204\" data-end=\"3507\"><p data-start=\"3206\" data-end=\"3507\"><strong data-start=\"3206\" data-end=\"3228\">Electroplating tin<\/strong> (plated tin) is a process used in PCB factories during two-copper procedures. It protects traces and plated-through holes before etching. After etching, the protective tin is removed and production moves on to solder mask printing. Plated tin is not seen in SMT assembly plants.<\/p><\/li><\/ul><hr data-start=\"3509\" data-end=\"3512\" \/><h2 data-start=\"3514\" data-end=\"3528\">Process Flow<\/h2><div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\"><div class=\"sticky top-9\"><div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\"><div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\">\u00a0<\/div><\/div><\/div><div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre!\">Board in \u2192 Degrease \u2192 Rinse \u2192 Micro-etch \u2192 Rinse \u2192 Activation \u2192 Pre-dip \u2192<br \/>\u2192 Immersion Tin <span class=\"hljs-selector-tag\">A<\/span> \u2192 Immersion Tin <span class=\"hljs-selector-tag\">B<\/span> \u2192 Hot water rinse \u2192 Cold water rinse \u2192 Drain \u2192 Dry<br \/><\/code><\/div><\/div><h3 data-start=\"3700\" data-end=\"3717\">Process Notes<\/h3><ol data-start=\"3719\" data-end=\"4483\"><li data-start=\"3719\" data-end=\"3962\"><p data-start=\"3722\" data-end=\"3962\"><strong data-start=\"3722\" data-end=\"3765\">Acid clean and degrease \/ hole cleaning<\/strong><br data-start=\"3765\" data-end=\"3768\" \/>GZ-2061 and GZ-2062 remove organic dirt, fingerprints, and copper oxides from pads and through holes. They prepare a clean copper surface for immersion tin. Materials used: GZ-2061 \/ GZ-2062.<\/p><\/li><li data-start=\"3964\" data-end=\"4110\"><p data-start=\"3967\" data-end=\"4110\"><strong data-start=\"3967\" data-end=\"3981\">Activation<\/strong><br data-start=\"3981\" data-end=\"3984\" \/>GZ-2066 protects the subsequent immersion tin bath. It reduces contamination and extends bath life. Material used: GZ-2066.<\/p><\/li><li data-start=\"4112\" data-end=\"4299\"><p data-start=\"4115\" data-end=\"4299\"><strong data-start=\"4115\" data-end=\"4130\">Pre-plating<\/strong><br data-start=\"4130\" data-end=\"4133\" \/>Pre-plating applies a thin tin layer on the copper base before immersion tin. This helps get a good final appearance and a dense tin layer. Material used: GZ-2069.<\/p><\/li><li data-start=\"4301\" data-end=\"4483\"><p data-start=\"4304\" data-end=\"4483\"><strong data-start=\"4304\" data-end=\"4321\">Immersion tin<\/strong><br data-start=\"4321\" data-end=\"4324\" \/>Immersion tin can replace spray tin. It deposits tin on the copper by displacement. The solderability can last more than six months. Material used: GZ-2069.<\/p><\/li><\/ol><hr data-start=\"4485\" data-end=\"4488\" \/><h2 data-start=\"4490\" data-end=\"4516\">Product Characteristics<\/h2><p data-start=\"4517\" data-end=\"4701\">After immersion tin, boards get a good look and a uniform, dense tin layer with strong adhesion. Typical thickness is 0.8\u20131.2 \u00b5m. The tin layer shows no whiskers or dendritic crystals.<\/p><hr data-start=\"4703\" data-end=\"4706\" \/><h2 data-start=\"4708\" data-end=\"4751\">Equipment and Tank Material Requirements<\/h2><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4753\" data-end=\"5186\"><thead data-start=\"4753\" data-end=\"4820\"><tr data-start=\"4753\" data-end=\"4820\"><th data-start=\"4753\" data-end=\"4760\" data-col-size=\"sm\">Item<\/th><th data-start=\"4760\" data-end=\"4781\" data-col-size=\"sm\">Through-hole tanks<\/th><th data-start=\"4781\" data-end=\"4800\" data-col-size=\"sm\">Black-hole tanks<\/th><th data-start=\"4800\" data-end=\"4820\" data-col-size=\"md\">Micro-etch tanks<\/th><\/tr><\/thead><tbody data-start=\"4842\" data-end=\"5186\"><tr data-start=\"4842\" data-end=\"4917\"><td data-start=\"4842\" data-end=\"4854\" data-col-size=\"sm\">Tank body<\/td><td data-start=\"4854\" data-end=\"4878\" data-col-size=\"sm\">PE, PP, 304 or 316 SS<\/td><td data-start=\"4878\" data-end=\"4896\" data-col-size=\"sm\">PP, PVC, 316 SS<\/td><td data-start=\"4896\" data-end=\"4917\" data-col-size=\"md\">PE, PP, rigid PVC<\/td><\/tr><tr data-start=\"4918\" data-end=\"5000\"><td data-start=\"4918\" data-end=\"4928\" data-col-size=\"sm\">Heaters<\/td><td data-start=\"4928\" data-end=\"4961\" data-col-size=\"sm\">304 or 316 SS or Teflon-coated<\/td><td data-start=\"4961\" data-end=\"4970\" data-col-size=\"sm\">316 SS<\/td><td data-start=\"4970\" data-end=\"5000\" data-col-size=\"md\">316 SS or titanium heaters<\/td><\/tr><tr data-start=\"5001\" data-end=\"5067\"><td data-start=\"5001\" data-end=\"5014\" data-col-size=\"sm\">Filtration<\/td><td data-start=\"5014\" data-end=\"5038\" data-col-size=\"sm\">Continuous filtration<\/td><td data-start=\"5038\" data-end=\"5042\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"5042\" data-end=\"5067\" data-col-size=\"md\">Continuous filtration<\/td><\/tr><tr data-start=\"5068\" data-end=\"5186\"><td data-start=\"5068\" data-end=\"5080\" data-col-size=\"sm\">Agitation<\/td><td data-start=\"5080\" data-end=\"5110\" data-col-size=\"sm\">Mechanical swing, vibration<\/td><td data-start=\"5110\" data-end=\"5140\" data-col-size=\"sm\">Mechanical swing, vibration<\/td><td data-start=\"5140\" data-end=\"5186\" data-col-size=\"md\">Mechanical swing, vibration, air agitation<\/td><\/tr><\/tbody><\/table><\/div><\/div><hr data-start=\"5188\" data-end=\"5191\" \/><h2 data-start=\"5193\" data-end=\"5210\">Process Control<\/h2><h3 data-start=\"5212\" data-end=\"5252\">1. Bath startup (making the solution)<\/h3><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"5253\" data-end=\"5812\"><thead data-start=\"5253\" data-end=\"5332\"><tr data-start=\"5253\" data-end=\"5332\"><th data-start=\"5253\" data-end=\"5265\" data-col-size=\"sm\">Tank name<\/th><th data-start=\"5265\" data-end=\"5276\" data-col-size=\"sm\">Chemical<\/th><th data-start=\"5276\" data-end=\"5290\" data-col-size=\"sm\">Tank volume<\/th><th data-start=\"5290\" data-end=\"5314\" data-col-size=\"sm\">Startup concentration<\/th><th data-start=\"5314\" data-end=\"5332\" data-col-size=\"sm\">Startup amount<\/th><\/tr><\/thead><tbody data-start=\"5358\" data-end=\"5812\"><tr data-start=\"5358\" data-end=\"5404\"><td data-start=\"5358\" data-end=\"5369\" data-col-size=\"sm\">Degrease<\/td><td data-start=\"5369\" data-end=\"5379\" data-col-size=\"sm\">GZ-2061<\/td><td data-start=\"5379\" data-end=\"5387\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5387\" data-end=\"5397\" data-col-size=\"sm\">50 mL\/L<\/td><td data-start=\"5397\" data-end=\"5404\" data-col-size=\"sm\">5 L<\/td><\/tr><tr data-start=\"5405\" data-end=\"5444\"><td data-start=\"5405\" data-end=\"5408\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5408\" data-end=\"5418\" data-col-size=\"sm\">GZ-2062<\/td><td data-start=\"5418\" data-end=\"5426\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5426\" data-end=\"5434\" data-col-size=\"sm\">2 g\/L<\/td><td data-start=\"5434\" data-end=\"5444\" data-col-size=\"sm\">0.2 Kg<\/td><\/tr><tr data-start=\"5445\" data-end=\"5481\"><td data-start=\"5445\" data-end=\"5448\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5448\" data-end=\"5456\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"5456\" data-end=\"5464\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5464\" data-end=\"5474\" data-col-size=\"sm\">50 mL\/L<\/td><td data-start=\"5474\" data-end=\"5481\" data-col-size=\"sm\">5 L<\/td><\/tr><tr data-start=\"5482\" data-end=\"5530\"><td data-start=\"5482\" data-end=\"5495\" data-col-size=\"sm\">Micro-etch<\/td><td data-start=\"5495\" data-end=\"5503\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"5503\" data-end=\"5511\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5511\" data-end=\"5521\" data-col-size=\"sm\">25 mL\/L<\/td><td data-start=\"5521\" data-end=\"5530\" data-col-size=\"sm\">2.5 L<\/td><\/tr><tr data-start=\"5531\" data-end=\"5569\"><td data-start=\"5531\" data-end=\"5534\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5534\" data-end=\"5544\" data-col-size=\"sm\">GZ-2065<\/td><td data-start=\"5544\" data-end=\"5552\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5552\" data-end=\"5561\" data-col-size=\"sm\">20 g\/L<\/td><td data-start=\"5561\" data-end=\"5569\" data-col-size=\"sm\">2 Kg<\/td><\/tr><tr data-start=\"5570\" data-end=\"5606\"><td data-start=\"5570\" data-end=\"5573\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5573\" data-end=\"5579\" data-col-size=\"sm\">SPS<\/td><td data-start=\"5579\" data-end=\"5587\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5587\" data-end=\"5597\" data-col-size=\"sm\">100 g\/L<\/td><td data-start=\"5597\" data-end=\"5606\" data-col-size=\"sm\">10 Kg<\/td><\/tr><tr data-start=\"5607\" data-end=\"5657\"><td data-start=\"5607\" data-end=\"5620\" data-col-size=\"sm\">Activation<\/td><td data-start=\"5620\" data-end=\"5630\" data-col-size=\"sm\">GZ-2066<\/td><td data-start=\"5630\" data-end=\"5638\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5638\" data-end=\"5649\" data-col-size=\"sm\">150 mL\/L<\/td><td data-start=\"5649\" data-end=\"5657\" data-col-size=\"sm\">15 L<\/td><\/tr><tr data-start=\"5658\" data-end=\"5706\"><td data-start=\"5658\" data-end=\"5672\" data-col-size=\"sm\">Pre-plating<\/td><td data-start=\"5672\" data-end=\"5682\" data-col-size=\"sm\">GZ-2069<\/td><td data-start=\"5682\" data-end=\"5690\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5690\" data-end=\"5697\" data-col-size=\"sm\">100%<\/td><td data-start=\"5697\" data-end=\"5706\" data-col-size=\"sm\">100 L<\/td><\/tr><tr data-start=\"5707\" data-end=\"5759\"><td data-start=\"5707\" data-end=\"5725\" data-col-size=\"sm\">Immersion Tin A<\/td><td data-start=\"5725\" data-end=\"5735\" data-col-size=\"sm\">GZ-2069<\/td><td data-start=\"5735\" data-end=\"5743\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5743\" data-end=\"5750\" data-col-size=\"sm\">100%<\/td><td data-start=\"5750\" data-end=\"5759\" data-col-size=\"sm\">100 L<\/td><\/tr><tr data-start=\"5760\" data-end=\"5812\"><td data-start=\"5760\" data-end=\"5778\" data-col-size=\"sm\">Immersion Tin B<\/td><td data-start=\"5778\" data-end=\"5788\" data-col-size=\"sm\">GZ-2069<\/td><td data-start=\"5788\" data-end=\"5796\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5796\" data-end=\"5803\" data-col-size=\"sm\">100%<\/td><td data-start=\"5803\" data-end=\"5812\" data-col-size=\"sm\">100 L<\/td><\/tr><\/tbody><\/table><\/div><\/div><h3 data-start=\"5814\" data-end=\"5840\">2. Operating Conditions<\/h3><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"5841\" data-end=\"6755\"><thead data-start=\"5841\" data-end=\"5930\"><tr data-start=\"5841\" data-end=\"5930\"><th data-start=\"5841\" data-end=\"5848\" data-col-size=\"sm\">Bath<\/th><th data-start=\"5848\" data-end=\"5864\" data-col-size=\"sm\">Analysis item<\/th><th data-start=\"5864\" data-end=\"5880\" data-col-size=\"sm\">Control range<\/th><th data-start=\"5880\" data-end=\"5896\" data-col-size=\"sm\">Analysis freq<\/th><th data-start=\"5896\" data-end=\"5903\" data-col-size=\"sm\">Temp<\/th><th data-start=\"5903\" data-end=\"5916\" data-col-size=\"sm\">Time (min)<\/th><th data-start=\"5916\" data-end=\"5930\" data-col-size=\"sm\">Filtration<\/th><\/tr><\/thead><tbody data-start=\"5966\" data-end=\"6755\"><tr data-start=\"5966\" data-end=\"6031\"><td data-start=\"5966\" data-end=\"5977\" data-col-size=\"sm\">Degrease<\/td><td data-start=\"5977\" data-end=\"5985\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"5985\" data-end=\"5998\" data-col-size=\"sm\">40\u201350 mL\/L<\/td><td data-start=\"5998\" data-end=\"6009\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6009\" data-end=\"6018\" data-col-size=\"sm\">40\u201350\u2103<\/td><td data-start=\"6018\" data-end=\"6024\" data-col-size=\"sm\">3\u20135<\/td><td data-start=\"6024\" data-end=\"6031\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6032\" data-end=\"6099\"><td data-start=\"6032\" data-end=\"6045\" data-col-size=\"sm\">Micro-etch<\/td><td data-start=\"6045\" data-end=\"6053\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"6053\" data-end=\"6066\" data-col-size=\"sm\">20\u201325 mL\/L<\/td><td data-start=\"6066\" data-end=\"6077\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6077\" data-end=\"6086\" data-col-size=\"sm\">20\u201330\u2103<\/td><td data-start=\"6086\" data-end=\"6092\" data-col-size=\"sm\">1\u20132<\/td><td data-start=\"6092\" data-end=\"6099\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6100\" data-end=\"6146\"><td data-start=\"6100\" data-end=\"6103\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6103\" data-end=\"6109\" data-col-size=\"sm\">SPS<\/td><td data-start=\"6109\" data-end=\"6122\" data-col-size=\"sm\">80\u2013120 g\/L<\/td><td data-start=\"6122\" data-end=\"6133\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6133\" data-end=\"6137\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6137\" data-end=\"6141\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6141\" data-end=\"6146\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6147\" data-end=\"6207\"><td data-start=\"6147\" data-end=\"6150\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6150\" data-end=\"6168\" data-col-size=\"sm\">Micro-etch rate<\/td><td data-start=\"6168\" data-end=\"6181\" data-col-size=\"sm\">0.5\u20131.5 \u00b5m<\/td><td data-start=\"6181\" data-end=\"6194\" data-col-size=\"sm\">once\/shift<\/td><td data-start=\"6194\" data-end=\"6198\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6198\" data-end=\"6202\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6202\" data-end=\"6207\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6208\" data-end=\"6252\"><td data-start=\"6208\" data-end=\"6211\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6211\" data-end=\"6218\" data-col-size=\"sm\">Cu\u00b2\u207a<\/td><td data-start=\"6218\" data-end=\"6228\" data-col-size=\"sm\">&lt;20 g\/L<\/td><td data-start=\"6228\" data-end=\"6239\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6239\" data-end=\"6243\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6243\" data-end=\"6247\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6247\" data-end=\"6252\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6253\" data-end=\"6322\"><td data-start=\"6253\" data-end=\"6266\" data-col-size=\"sm\">Activation<\/td><td data-start=\"6266\" data-end=\"6277\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6277\" data-end=\"6289\" data-col-size=\"sm\">0.1\u20130.2 N<\/td><td data-start=\"6289\" data-end=\"6300\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6300\" data-end=\"6309\" data-col-size=\"sm\">22\u201332\u2103<\/td><td data-start=\"6309\" data-end=\"6315\" data-col-size=\"sm\">1\u20132<\/td><td data-start=\"6315\" data-end=\"6322\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6323\" data-end=\"6393\"><td data-start=\"6323\" data-end=\"6337\" data-col-size=\"sm\">Pre-plating<\/td><td data-start=\"6337\" data-end=\"6348\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6348\" data-end=\"6360\" data-col-size=\"sm\">2.0\u20134.0 N<\/td><td data-start=\"6360\" data-end=\"6371\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6371\" data-end=\"6380\" data-col-size=\"sm\">36\u201340\u2103<\/td><td data-start=\"6380\" data-end=\"6386\" data-col-size=\"sm\">1\u20132<\/td><td data-start=\"6386\" data-end=\"6393\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6394\" data-end=\"6439\"><td data-start=\"6394\" data-end=\"6397\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6397\" data-end=\"6410\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"6410\" data-end=\"6422\" data-col-size=\"sm\">12\u201316 g\/L<\/td><td data-start=\"6422\" data-end=\"6426\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6426\" data-end=\"6430\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6430\" data-end=\"6434\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6434\" data-end=\"6439\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6440\" data-end=\"6515\"><td data-start=\"6440\" data-end=\"6458\" data-col-size=\"sm\">Immersion Tin A<\/td><td data-start=\"6458\" data-end=\"6469\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6469\" data-end=\"6481\" data-col-size=\"sm\">2.0\u20134.0 N<\/td><td data-start=\"6481\" data-end=\"6492\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6492\" data-end=\"6501\" data-col-size=\"sm\">50\u201360\u2103<\/td><td data-start=\"6501\" data-end=\"6508\" data-col-size=\"sm\">5\u201310<\/td><td data-start=\"6508\" data-end=\"6515\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6516\" data-end=\"6568\"><td data-start=\"6516\" data-end=\"6519\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6519\" data-end=\"6532\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"6532\" data-end=\"6544\" data-col-size=\"sm\">12\u201316 g\/L<\/td><td data-start=\"6544\" data-end=\"6555\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6555\" data-end=\"6559\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6559\" data-end=\"6563\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6563\" data-end=\"6568\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6569\" data-end=\"6645\"><td data-start=\"6569\" data-end=\"6587\" data-col-size=\"sm\">Immersion Tin B<\/td><td data-start=\"6587\" data-end=\"6598\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6598\" data-end=\"6610\" data-col-size=\"sm\">2.0\u20134.0 N<\/td><td data-start=\"6610\" data-end=\"6621\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6621\" data-end=\"6630\" data-col-size=\"sm\">68\u201372\u2103<\/td><td data-start=\"6630\" data-end=\"6638\" data-col-size=\"sm\">10\u201312<\/td><td data-start=\"6638\" data-end=\"6645\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6646\" data-end=\"6698\"><td data-start=\"6646\" data-end=\"6649\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6649\" data-end=\"6662\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"6662\" data-end=\"6674\" data-col-size=\"sm\">12\u201316 g\/L<\/td><td data-start=\"6674\" data-end=\"6685\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6685\" data-end=\"6689\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6689\" data-end=\"6693\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6693\" data-end=\"6698\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6699\" data-end=\"6755\"><td data-start=\"6699\" data-end=\"6702\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6702\" data-end=\"6718\" data-col-size=\"sm\">Tin thickness<\/td><td data-start=\"6718\" data-end=\"6731\" data-col-size=\"sm\">0.8\u20131.2 \u00b5m<\/td><td data-start=\"6731\" data-end=\"6742\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6742\" data-end=\"6746\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6746\" data-end=\"6750\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6750\" data-end=\"6755\" data-col-size=\"sm\">\u2014<\/td><\/tr><\/tbody><\/table><\/div><\/div><hr data-start=\"6757\" data-end=\"6760\" \/><h3 data-start=\"6762\" data-end=\"6808\">3. Bath Replenishment and Replacement Rules<\/h3><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6810\" data-end=\"7466\"><thead data-start=\"6810\" data-end=\"6876\"><tr data-start=\"6810\" data-end=\"6876\"><th data-start=\"6810\" data-end=\"6817\" data-col-size=\"sm\">Bath<\/th><th data-start=\"6817\" data-end=\"6828\" data-col-size=\"sm\">Chemical<\/th><th data-start=\"6828\" data-end=\"6840\" data-col-size=\"sm\">Replenish<\/th><th data-start=\"6840\" data-end=\"6859\" data-col-size=\"sm\">Replace standard<\/th><th data-start=\"6859\" data-end=\"6876\" data-col-size=\"sm\">Filter change<\/th><\/tr><\/thead><tbody data-start=\"6901\" data-end=\"7466\"><tr data-start=\"6901\" data-end=\"7002\"><td data-start=\"6901\" data-end=\"6912\" data-col-size=\"sm\">Degrease<\/td><td data-start=\"6912\" data-end=\"6920\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"6920\" data-end=\"6938\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"6938\" data-end=\"6978\" data-col-size=\"sm\">Replace when treat 40\u201350 m\u00b2 of boards<\/td><td data-start=\"6978\" data-end=\"7002\" data-col-size=\"sm\">Change filter weekly<\/td><\/tr><tr data-start=\"7003\" data-end=\"7095\"><td data-start=\"7003\" data-end=\"7016\" data-col-size=\"sm\">Micro-etch<\/td><td data-start=\"7016\" data-end=\"7024\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"7024\" data-end=\"7042\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7042\" data-end=\"7071\" data-col-size=\"sm\">Replace when Cu\u00b2\u207a &gt; 20 g\/L<\/td><td data-start=\"7071\" data-end=\"7095\" data-col-size=\"sm\">Change filter weekly<\/td><\/tr><tr data-start=\"7096\" data-end=\"7132\"><td data-start=\"7096\" data-end=\"7099\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"7099\" data-end=\"7105\" data-col-size=\"sm\">SPS<\/td><td data-start=\"7105\" data-end=\"7123\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7123\" data-end=\"7127\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7127\" data-end=\"7132\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"7133\" data-end=\"7203\"><td data-start=\"7133\" data-end=\"7146\" data-col-size=\"sm\">Activation<\/td><td data-start=\"7146\" data-end=\"7157\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"7157\" data-end=\"7175\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7175\" data-end=\"7179\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7179\" data-end=\"7203\" data-col-size=\"sm\">Change filter weekly<\/td><\/tr><tr data-start=\"7204\" data-end=\"7298\"><td data-start=\"7204\" data-end=\"7218\" data-col-size=\"sm\">Pre-plating<\/td><td data-start=\"7218\" data-end=\"7222\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7222\" data-end=\"7240\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7240\" data-end=\"7268\" data-col-size=\"sm\">Replace when Cu\u00b2\u207a &gt; 8 g\/L<\/td><td data-start=\"7268\" data-end=\"7298\" data-col-size=\"sm\">Change filter every 2 days<\/td><\/tr><tr data-start=\"7299\" data-end=\"7328\"><td data-start=\"7299\" data-end=\"7302\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"7302\" data-end=\"7315\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"7315\" data-end=\"7319\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7319\" data-end=\"7323\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7323\" data-end=\"7328\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"7329\" data-end=\"7436\"><td data-start=\"7329\" data-end=\"7345\" data-col-size=\"sm\">Immersion tin<\/td><td data-start=\"7345\" data-end=\"7360\" data-col-size=\"sm\">Acid content<\/td><td data-start=\"7360\" data-end=\"7378\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7378\" data-end=\"7406\" data-col-size=\"sm\">Replace when Cu\u00b2\u207a &gt; 8 g\/L<\/td><td data-start=\"7406\" data-end=\"7436\" data-col-size=\"sm\">Change filter every 2 days<\/td><\/tr><tr data-start=\"7437\" data-end=\"7466\"><td data-start=\"7437\" data-end=\"7440\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"7440\" data-end=\"7453\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"7453\" data-end=\"7457\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7457\" data-end=\"7461\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7461\" data-end=\"7466\" data-col-size=\"sm\">\u2014<\/td><\/tr><\/tbody><\/table><\/div><\/div><hr data-start=\"7468\" data-end=\"7471\" \/><h3 data-start=\"7473\" data-end=\"7497\">4. Storage Conditions<\/h3><ul data-start=\"7498\" data-end=\"7625\"><li data-start=\"7498\" data-end=\"7594\"><p data-start=\"7500\" data-end=\"7594\">GZ-2001, GZ-2002, GZ-2004: avoid direct sunlight. Shelf life two years. Store at -5\u2103 to 40\u2103.<\/p><\/li><li data-start=\"7595\" data-end=\"7625\"><p data-start=\"7597\" data-end=\"7625\">GZ-2003: store at 3\u2103 to 30\u2103.<\/p><\/li><\/ul><hr data-start=\"7627\" data-end=\"7630\" \/><h3 data-start=\"7632\" data-end=\"7658\">5. Wastewater Treatment<\/h3><ul data-start=\"7659\" data-end=\"8103\"><li data-start=\"7659\" data-end=\"7741\"><p data-start=\"7661\" data-end=\"7741\">Clean tank waste: neutralize with acid then discharge per environmental rules.<\/p><\/li><li data-start=\"7742\" data-end=\"7817\"><p data-start=\"7744\" data-end=\"7817\">Through-hole tank waste: neutralize with acid then discharge per rules.<\/p><\/li><li data-start=\"7818\" data-end=\"7881\"><p data-start=\"7820\" data-end=\"7881\">Activation tank waste: neutralize then discharge per rules.<\/p><\/li><li data-start=\"7882\" data-end=\"7960\"><p data-start=\"7884\" data-end=\"7960\">Immersion tin tank waste: neutralize with alkali then discharge per rules.<\/p><\/li><li data-start=\"7961\" data-end=\"8103\"><p data-start=\"7963\" data-end=\"8103\">Micro-etch waste: recover copper sulfate by electro-purification and recrystallization. Then neutralize with alkali and discharge per rules.<\/p><\/li><\/ul><hr data-start=\"8105\" data-end=\"8108\" \/><h2 data-start=\"8110\" data-end=\"8136\">Reagent Analysis Methods<\/h2><h3 data-start=\"8138\" data-end=\"8168\">1. H\u2082SO\u2084 in micro-etch bath<\/h3><p data-start=\"8169\" data-end=\"8183\"><strong data-start=\"8169\" data-end=\"8181\">Reagents<\/strong><\/p><ol data-start=\"8184\" data-end=\"8261\"><li data-start=\"8184\" data-end=\"8229\"><p data-start=\"8187\" data-end=\"8229\">NaOH standard solution [c(NaOH)=1 mol\/L]<\/p><\/li><li data-start=\"8230\" data-end=\"8261\"><p data-start=\"8233\" data-end=\"8261\">0.1% methyl orange indicator<\/p><\/li><\/ol><p data-start=\"8263\" data-end=\"8274\"><strong data-start=\"8263\" data-end=\"8272\">Steps<\/strong><\/p><ol data-start=\"8275\" data-end=\"8478\"><li data-start=\"8275\" data-end=\"8335\"><p data-start=\"8278\" data-end=\"8335\">Take 5 mL of tank solution into a 250 mL conical flask.<\/p><\/li><li data-start=\"8336\" data-end=\"8390\"><p data-start=\"8339\" data-end=\"8390\">Add 50 mL pure water and 2\u20135 drops methyl orange.<\/p><\/li><li data-start=\"8391\" data-end=\"8478\"><p data-start=\"8394\" data-end=\"8478\">Titrate with NaOH (1 mol\/L) until color changes from red to yellow. Record volume V.<\/p><\/li><\/ol><p data-start=\"8480\" data-end=\"8599\"><strong data-start=\"8480\" data-end=\"8495\">Calculation<\/strong><br data-start=\"8495\" data-end=\"8498\" \/>H\u2082SO\u2084 (mL\/L) = 5.43 \u00d7 c \u00d7 V<br data-start=\"8525\" data-end=\"8528\" \/>c = actual concentration of NaOH (mol\/L)<br data-start=\"8568\" data-end=\"8571\" \/>V = volume of NaOH used (mL)<\/p><p data-start=\"8601\" data-end=\"8670\"><strong data-start=\"8601\" data-end=\"8608\">Add<\/strong><br data-start=\"8608\" data-end=\"8611\" \/>H\u2082SO\u2084 (mL) = (set value \u2013 analysis value) \u00d7 tank volume (L)<\/p><hr data-start=\"8672\" data-end=\"8675\" \/><h3 data-start=\"8677\" data-end=\"8705\">2. SPS in micro-etch bath<\/h3><p data-start=\"8706\" data-end=\"8720\"><strong data-start=\"8706\" data-end=\"8718\">Reagents<\/strong><\/p><ol data-start=\"8721\" data-end=\"8831\"><li data-start=\"8721\" data-end=\"8785\"><p data-start=\"8724\" data-end=\"8785\">Sodium thiosulfate standard solution [c(Na\u2082S\u2082O\u2083)=0.1 mol\/L]<\/p><\/li><li data-start=\"8786\" data-end=\"8810\"><p data-start=\"8789\" data-end=\"8810\">1% starch indicator<\/p><\/li><li data-start=\"8811\" data-end=\"8818\"><p data-start=\"8814\" data-end=\"8818\">KI<\/p><\/li><li data-start=\"8819\" data-end=\"8831\"><p data-start=\"8822\" data-end=\"8831\">20% H\u2082SO\u2084<\/p><\/li><\/ol><p data-start=\"8833\" data-end=\"8844\"><strong data-start=\"8833\" data-end=\"8842\">Steps<\/strong><\/p><ol data-start=\"8845\" data-end=\"9107\"><li data-start=\"8845\" data-end=\"8895\"><p data-start=\"8848\" data-end=\"8895\">Take 2 mL of tank solution in a 250 mL flask.<\/p><\/li><li data-start=\"8896\" data-end=\"8971\"><p data-start=\"8899\" data-end=\"8971\">Add 50 mL pure water, 5 mL 20% H\u2082SO\u2084, 2 g KI, keep in dark for 20 min.<\/p><\/li><li data-start=\"8972\" data-end=\"9051\"><p data-start=\"8975\" data-end=\"9051\">Titrate with Na\u2082S\u2082O\u2083 until light yellow. Add a few drops starch indicator.<\/p><\/li><li data-start=\"9052\" data-end=\"9107\"><p data-start=\"9055\" data-end=\"9107\">Continue titration until colorless. Record volume V.<\/p><\/li><\/ol><p data-start=\"9109\" data-end=\"9149\"><strong data-start=\"9109\" data-end=\"9124\">Calculation<\/strong><br data-start=\"9124\" data-end=\"9127\" \/>SPS (g\/L) = 60 \u00d7 c \u00d7 V<\/p><p data-start=\"9151\" data-end=\"9230\"><strong data-start=\"9151\" data-end=\"9158\">Add<\/strong><br data-start=\"9158\" data-end=\"9161\" \/>Total SPS (g) to add = (set value \u2013 analysis value) \u00d7 tank volume (L)<\/p><hr data-start=\"9232\" data-end=\"9235\" \/><h3 data-start=\"9237\" data-end=\"9266\">3. Cu\u00b2\u207a in micro-etch bath<\/h3><p data-start=\"9267\" data-end=\"9281\"><strong data-start=\"9267\" data-end=\"9279\">Reagents<\/strong><\/p><ol data-start=\"9282\" data-end=\"9394\"><li data-start=\"9282\" data-end=\"9328\"><p data-start=\"9285\" data-end=\"9328\">EDTA-2Na standard solution [c=0.05 mol\/L]<\/p><\/li><li data-start=\"9329\" data-end=\"9372\"><p data-start=\"9332\" data-end=\"9372\">pH=10 ammonia-ammonium chloride buffer<\/p><\/li><li data-start=\"9373\" data-end=\"9394\"><p data-start=\"9376\" data-end=\"9394\">0.1% PAN indicator<\/p><\/li><\/ol><p data-start=\"9396\" data-end=\"9407\"><strong data-start=\"9396\" data-end=\"9405\">Steps<\/strong><\/p><ol data-start=\"9408\" data-end=\"9579\"><li data-start=\"9408\" data-end=\"9457\"><p data-start=\"9411\" data-end=\"9457\">Take 1 mL tank solution into a 250 mL flask.<\/p><\/li><li data-start=\"9458\" data-end=\"9518\"><p data-start=\"9461\" data-end=\"9518\">Add 100 mL pure water, 20 mL pH=10 buffer, 5 drops PAN.<\/p><\/li><li data-start=\"9519\" data-end=\"9579\"><p data-start=\"9522\" data-end=\"9579\">Titrate with EDTA-2Na until grass green. Record volume V.<\/p><\/li><\/ol><p data-start=\"9581\" data-end=\"9624\"><strong data-start=\"9581\" data-end=\"9596\">Calculation<\/strong><br data-start=\"9596\" data-end=\"9599\" \/>Cu\u00b2\u207a (g\/L) = 63.5 \u00d7 c \u00d7 V<\/p><p data-start=\"9626\" data-end=\"9658\"><strong data-start=\"9626\" data-end=\"9643\">Control range<\/strong>: Cu\u00b2\u207a &lt; 30 g\/L<\/p><hr data-start=\"9660\" data-end=\"9663\" \/><h3 data-start=\"9665\" data-end=\"9709\">4. H\u2082SO\u2084 in cleaning \/ through-hole agent<\/h3><p data-start=\"9710\" data-end=\"9767\">Same as micro-etch H\u2082SO\u2084 test. Control range: 40\u201350 mL\/L.<\/p><hr data-start=\"9769\" data-end=\"9772\" \/><h3 data-start=\"9774\" data-end=\"9802\">5. Acid eq. in activation<\/h3><p data-start=\"9803\" data-end=\"10056\"><strong data-start=\"9803\" data-end=\"9815\">Reagents<\/strong>: NaOH standard 0.1 mol\/L, 0.1% bromophenol green indicator<br data-start=\"9874\" data-end=\"9877\" \/><strong data-start=\"9877\" data-end=\"9887\">Method<\/strong>: Take 5 mL sample, add 150 mL pure water and indicator, titrate with NaOH 0.1 mol\/L to blue end point.<br data-start=\"9990\" data-end=\"9993\" \/><strong data-start=\"9993\" data-end=\"10008\">Calculation<\/strong>: Acid eq. = 0.02 \u00d7 V. Control range: 0.1\u20130.2 N.<\/p><hr data-start=\"10058\" data-end=\"10061\" \/><h2 data-start=\"10063\" data-end=\"10093\">Immersion Tin Bath Analysis<\/h2><h3 data-start=\"10095\" data-end=\"10126\">1. Acid equivalent analysis<\/h3><p data-start=\"10127\" data-end=\"10352\"><strong data-start=\"10127\" data-end=\"10139\">Reagents<\/strong>: NaOH 1 mol\/L, 0.1% phenolphthalein indicator<br data-start=\"10185\" data-end=\"10188\" \/><strong data-start=\"10188\" data-end=\"10198\">Method<\/strong>: Take 2 mL sample, add 100 mL pure water and indicator, titrate with NaOH until colorless turns red. Record V.<br data-start=\"10309\" data-end=\"10312\" \/><strong data-start=\"10312\" data-end=\"10327\">Calculation<\/strong>: Acid eq. = 0.5 \u00d7 c \u00d7 V.<\/p><h3 data-start=\"10354\" data-end=\"10381\">2. Tin content analysis<\/h3><p data-start=\"10382\" data-end=\"10751\"><strong data-start=\"10382\" data-end=\"10394\">Reagents<\/strong>: EDTA-2Na 0.05 mol\/L, dimethylphenol orange indicator (mix 100 mg dimethylphenol orange with 10 g KNO\u2083), pH 4.5 acetate buffer.<br data-start=\"10522\" data-end=\"10525\" \/><strong data-start=\"10525\" data-end=\"10535\">Method<\/strong>: Take 5 mL sample, add 25 mL pH 4.5 buffer and 100 mL pure water. Mix and add about 50 mg indicator. Titrate with EDTA-2Na until color changes from pink to yellow. Record V.<br data-start=\"10709\" data-end=\"10712\" \/><strong data-start=\"10712\" data-end=\"10727\">Calculation<\/strong>: Sn (g\/L) = 24 \u00d7 c \u00d7 V.<\/p><h3 data-start=\"10753\" data-end=\"10786\">3. Cu\u00b2\u207a in immersion tin bath<\/h3><p data-start=\"10787\" data-end=\"10866\">Same EDTA method as above. Control Cu\u00b2\u207a: use formula Cu\u00b2\u207a (g\/L) = 63.5 \u00d7 c \u00d7 V.<\/p><hr data-start=\"10868\" data-end=\"10871\" \/><h2 data-start=\"10873\" data-end=\"10890\">Quality Control<\/h2><h2 data-start=\"10892\" data-end=\"10930\">Tin thickness by gravimetric method<\/h2><ol data-start=\"10931\" data-end=\"11318\"><li data-start=\"10931\" data-end=\"11058\"><p data-start=\"10934\" data-end=\"11058\">Take a 5 \u00d7 5 cm\u00b2 double-sided copper-clad board without holes. Bake at 120\u2103 for 15 min. Cool 15 min. Weigh precisely = W1.<\/p><\/li><li data-start=\"11059\" data-end=\"11140\"><p data-start=\"11062\" data-end=\"11140\">After degrease and micro-etch, bake at 120\u2103 15 min. Cool 15 min. Weigh = W2.<\/p><\/li><li data-start=\"11141\" data-end=\"11212\"><p data-start=\"11144\" data-end=\"11212\">After immersion tin, bake at 120\u2103 15 min. Cool 15 min. Weigh = W3.<\/p><\/li><li data-start=\"11213\" data-end=\"11264\"><p data-start=\"11216\" data-end=\"11264\">Micro-etch thickness (\u00b5m) = 22.42 \u00d7 (W1 \u2013 W2).<\/p><\/li><li data-start=\"11265\" data-end=\"11318\"><p data-start=\"11268\" data-end=\"11318\">Immersion tin thickness (\u00b5m) = 386.13 \u00d7 (W3 \u2013 W2).<\/p><\/li><\/ol><p data-start=\"11320\" data-end=\"11473\">Where W1 = weight before micro-etch (g)<br data-start=\"11359\" data-end=\"11362\" \/>W2 = weight after micro-etch (g)<br data-start=\"11394\" data-end=\"11397\" \/>W3 = weight after tin plating (g)<br data-start=\"11430\" data-end=\"11433\" \/>22.42 and 386.13 are conversion factors.<\/p><hr data-start=\"11475\" data-end=\"11478\" \/><h2 data-start=\"11480\" data-end=\"11495\">Special Notes<\/h2><ol data-start=\"11497\" data-end=\"11813\"><li data-start=\"11497\" data-end=\"11625\"><p data-start=\"11500\" data-end=\"11625\">Use weight method or X-ray to measure tin thickness. Keep thickness at 0.8\u20131.2 \u00b5m to ensure solderability and storage life.<\/p><\/li><li data-start=\"11626\" data-end=\"11813\"><p data-start=\"11629\" data-end=\"11813\">Before solder mask printing, roughen the copper surface with a coarse process and use high quality ink for solder mask. This ensures the solder mask can resist immersion tin chemicals.<\/p><\/li><\/ol><hr data-start=\"11815\" data-end=\"11818\" \/><h1 data-start=\"11820\" data-end=\"11850\">Troubleshooting and Remedies<\/h1><ul data-start=\"11852\" data-end=\"13640\"><li data-start=\"11852\" data-end=\"12326\"><p data-start=\"11854\" data-end=\"11890\"><strong data-start=\"11854\" data-end=\"11888\">Problem: Tin thickness too low<\/strong><\/p><ul data-start=\"11893\" data-end=\"12326\"><li data-start=\"11893\" data-end=\"12035\"><p data-start=\"11895\" data-end=\"11940\">Possible cause 1: Tank temperature too low.<\/p><ul data-start=\"11945\" data-end=\"12035\"><li data-start=\"11945\" data-end=\"12035\"><p data-start=\"11947\" data-end=\"12035\">Remedy: Check heater. Make sure temperature is in process range before plating boards.<\/p><\/li><\/ul><\/li><li data-start=\"12038\" data-end=\"12132\"><p data-start=\"12040\" data-end=\"12082\">Possible cause 2: Tank acidity too high.<\/p><ul data-start=\"12087\" data-end=\"12132\"><li data-start=\"12087\" data-end=\"12132\"><p data-start=\"12089\" data-end=\"12132\">Remedy: Add pure water to adjust acidity.<\/p><\/li><\/ul><\/li><li data-start=\"12135\" data-end=\"12223\"><p data-start=\"12137\" data-end=\"12173\">Possible cause 3: Tin content low.<\/p><ul data-start=\"12178\" data-end=\"12223\"><li data-start=\"12178\" data-end=\"12223\"><p data-start=\"12180\" data-end=\"12223\">Remedy: Add GZ-2069-B to raise tin level.<\/p><\/li><\/ul><\/li><li data-start=\"12226\" data-end=\"12326\"><p data-start=\"12228\" data-end=\"12268\">Possible cause 4: Micro-etch rate low.<\/p><ul data-start=\"12273\" data-end=\"12326\"><li data-start=\"12273\" data-end=\"12326\"><p data-start=\"12275\" data-end=\"12326\">Remedy: Raise micro-etch rate within process range.<\/p><\/li><\/ul><\/li><\/ul><\/li><li data-start=\"12328\" data-end=\"12834\"><p data-start=\"12330\" data-end=\"12364\"><strong data-start=\"12330\" data-end=\"12362\">Problem: Tin surface darkens<\/strong><\/p><ul data-start=\"12367\" data-end=\"12834\"><li data-start=\"12367\" data-end=\"12492\"><p data-start=\"12369\" data-end=\"12410\">Possible cause 1: Poor tank filtration.<\/p><ul data-start=\"12415\" data-end=\"12492\"><li data-start=\"12415\" data-end=\"12492\"><p data-start=\"12417\" data-end=\"12492\">Remedy: Check filter system. Replace filter. Filter at 40\u2103 for 2\u20134 hours.<\/p><\/li><\/ul><\/li><li data-start=\"12495\" data-end=\"12589\"><p data-start=\"12497\" data-end=\"12539\">Possible cause 2: Tank acidity too high.<\/p><ul data-start=\"12544\" data-end=\"12589\"><li data-start=\"12544\" data-end=\"12589\"><p data-start=\"12546\" data-end=\"12589\">Remedy: Add pure water to adjust acidity.<\/p><\/li><\/ul><\/li><li data-start=\"12592\" data-end=\"12722\"><p data-start=\"12594\" data-end=\"12639\">Possible cause 3: Micro-etch speed too low.<\/p><ul data-start=\"12644\" data-end=\"12722\"><li data-start=\"12644\" data-end=\"12722\"><p data-start=\"12646\" data-end=\"12722\">Remedy: Check H\u2082SO\u2084, Na\u2082S\u2082O\u2088, Cu\u00b2\u207a levels in micro-etch. Keep them normal.<\/p><\/li><\/ul><\/li><li data-start=\"12725\" data-end=\"12834\"><p data-start=\"12727\" data-end=\"12781\">Possible cause 4: Rinse not clean after tin plating.<\/p><ul data-start=\"12786\" data-end=\"12834\"><li data-start=\"12786\" data-end=\"12834\"><p data-start=\"12788\" data-end=\"12834\">Remedy: Improve rinsing or replace rinse tank.<\/p><\/li><\/ul><\/li><\/ul><\/li><li data-start=\"12836\" data-end=\"13291\"><p data-start=\"12838\" data-end=\"12869\"><strong data-start=\"12838\" data-end=\"12867\">Problem: Uneven tin color<\/strong><\/p><ul data-start=\"12872\" data-end=\"13291\"><li data-start=\"12872\" data-end=\"12970\"><p data-start=\"12874\" data-end=\"12925\">Possible cause 1: Tank specific gravity too high.<\/p><ul data-start=\"12930\" data-end=\"12970\"><li data-start=\"12930\" data-end=\"12970\"><p data-start=\"12932\" data-end=\"12970\">Remedy: Dilute solution and analyze.<\/p><\/li><\/ul><\/li><li data-start=\"12973\" data-end=\"13075\"><p data-start=\"12975\" data-end=\"13020\">Possible cause 2: Micro-etch speed too low.<\/p><ul data-start=\"13025\" data-end=\"13075\"><li data-start=\"13025\" data-end=\"13075\"><p data-start=\"13027\" data-end=\"13075\">Remedy: Check micro-etch H\u2082SO\u2084, Na\u2082S\u2082O\u2088, Cu\u00b2\u207a.<\/p><\/li><\/ul><\/li><li data-start=\"13078\" data-end=\"13206\"><p data-start=\"13080\" data-end=\"13149\">Possible cause 3: Contamination in pre-plate or immersion tin bath.<\/p><ul data-start=\"13154\" data-end=\"13206\"><li data-start=\"13154\" data-end=\"13206\"><p data-start=\"13156\" data-end=\"13206\">Remedy: Replace pre-plate or immersion tin bath.<\/p><\/li><\/ul><\/li><li data-start=\"13209\" data-end=\"13291\"><p data-start=\"13211\" data-end=\"13255\">Possible cause 4: Copper surface abnormal.<\/p><ul data-start=\"13260\" data-end=\"13291\"><li data-start=\"13260\" data-end=\"13291\"><p data-start=\"13262\" data-end=\"13291\">Remedy: Clean copper surface.<\/p><\/li><\/ul><\/li><\/ul><\/li><li data-start=\"13293\" data-end=\"13640\"><p data-start=\"13295\" data-end=\"13328\"><strong data-start=\"13295\" data-end=\"13326\">Problem: Poor solderability<\/strong><\/p><ul data-start=\"13331\" data-end=\"13640\"><li data-start=\"13331\" data-end=\"13422\"><p data-start=\"13333\" data-end=\"13379\">Possible cause 1: Cu\u00b2\u207a in tin tank too high.<\/p><ul data-start=\"13384\" data-end=\"13422\"><li data-start=\"13384\" data-end=\"13422\"><p data-start=\"13386\" data-end=\"13422\">Remedy: Replace tin bath solution.<\/p><\/li><\/ul><\/li><li data-start=\"13425\" data-end=\"13536\"><p data-start=\"13427\" data-end=\"13481\">Possible cause 2: Rinse not clean after tin plating.<\/p><ul data-start=\"13486\" data-end=\"13536\"><li data-start=\"13486\" data-end=\"13536\"><p data-start=\"13488\" data-end=\"13536\">Remedy: Improve rinsing or replace rinse tank.<\/p><\/li><\/ul><\/li><li data-start=\"13539\" data-end=\"13640\"><p data-start=\"13541\" data-end=\"13593\">Possible cause 3: Contamination during air drying.<\/p><ul data-start=\"13598\" data-end=\"13640\"><li data-start=\"13598\" data-end=\"13640\"><p data-start=\"13600\" data-end=\"13640\">Remedy: Clean drying section and blower.<\/p><\/li><\/ul><\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-epyg0ll elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"epyg0ll\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\" data-id=\"7882748\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\" data-id=\"9fc6712\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently Asked Questions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-631b990 elementor-widget elementor-widget-accordion\" data-id=\"631b990\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1031\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-1031\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Why choose immersion tin instead of HASL or ENIG?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1031\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-1031\"><p>ImSn gives a flat, planar surface (better for fine-pitch and BGAs) and is usually cheaper than ENIG while offering better planarity than HASL. Choice depends on mating\/wear needs and long-term reliability requirements.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1032\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-1032\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Is there a tin-whisker risk with immersion tin?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1032\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-1032\"><p>Pure tin finishes can, in some conditions, grow whiskers that risk shorting. Good process control, vendor mitigation (e.g., diffuse alloying or underlayers), conformal coating, or alternative finishes can manage that risk\u2014discuss with your fabricator for high-reliability applications.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1033\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-1033\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">How long can immersion tin boards be stored before assembly?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1033\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-1033\"><p>Shelf life depends on packaging and environment. Under dry, controlled storage, typical practical shelf life is limited (months rather than years); ask your supplier for recommended storage time and packing (vacuum\/desiccant).<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1034\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-1034\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Can immersion tin be used for edge contacts or gold fingers?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1034\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-1034\"><p>No\u2014immersion tin is not suitable for repeated mechanical mating. For edge connectors or high mating cycles use electroplated hard gold over nickel.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1035\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-1035\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">What tests should I request for immersion tin finishes?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1035\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-1035\"><p>Request solderability tests, thickness\/XRF spot checks, visual inspection for residues\/tarnish, and (for critical projects) whisker and humidity\/migration testing.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-1036\" class=\"elementor-tab-title\" data-tab=\"6\" role=\"button\" aria-controls=\"elementor-tab-content-1036\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-right\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><svg class=\"e-font-icon-svg e-fas-plus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><svg class=\"e-font-icon-svg e-fas-minus-circle\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\"><\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Any assembly or design notes for using immersion tin?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-1036\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"6\" role=\"region\" aria-labelledby=\"elementor-tab-title-1036\"><p>Coordinate with assembler on paste\/flux, reflow profile, and cleaning. Avoid placing mechanical mating surfaces on ImSn areas; call out any via-in-pad or pad fill needs in fabrication notes.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Overview Chemical tin plating, often called immersion tin, is a surface finish used for SMT and chip packaging. It deposits [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"parent":1898,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center\";s:15:\"background-size\";s:4:\"auto\";s:21:\"background-attachment\";s:6:\"scroll\";s:15:\"background-type\";s:0:\"\";s:16:\"background-media\";s:0:\"\";s:12:\"overlay-type\";s:0:\"\";s:13:\"overlay-color\";s:0:\"\";s:15:\"overlay-opacity\";s:0:\"\";s:16:\"overlay-gradient\";s:0:\"\";}}"],"footnotes":[""],"_elementor_edit_mode":["builder"],"_elementor_template_type":["wp-page"],"_elementor_data":["[{\"id\":\"a66c6dc\",\"elType\":\"container\",\"settings\":{\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"3f7c1c5\"}]},\"elements\":[{\"id\":\"e3844ef\",\"elType\":\"widget\",\"settings\":{\"editor\":\"<h2 data-start=\\\"48\\\" data-end=\\\"59\\\">Overview<\\\/h2><p data-start=\\\"60\\\" data-end=\\\"548\\\">Chemical tin plating, often called immersion tin, is a surface finish used for SMT and chip packaging. It deposits a tin metal layer on copper by a chemical reaction. It works well for high-density and high-precision boards. It also suits fine traces, narrow pads, and small pitch PCBs. This finish is a green process that can replace Pb-Sn alloy plating. The deposited tin layer has fine crystal structure, a silver-white look, a flat surface, good solderability, and stable performance.<\\\/p><p data-start=\\\"60\\\" data-end=\\\"548\\\"><img class=\\\"alignnone size-full wp-image-2833\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/Manual-Dip-Soldering.webp\\\" alt=\\\"Manual Dip Soldering\\\" width=\\\"353\\\" height=\\\"248\\\" \\\/><\\\/p><p data-start=\\\"550\\\" data-end=\\\"962\\\">The principle of chemical tin plating is to change the chemical potential of copper ions so that stannous ions in the bath undergo a displacement reaction. Reduced tin metal deposits on the copper surface to form a tin layer. Metal complexes that adsorb on the immersion tin surface help catalyze tin ion reduction. This keeps the reduction reaction going and ensures the tin layer grows to the needed thickness.<\\\/p><hr data-start=\\\"964\\\" data-end=\\\"967\\\" \\\/><h2 data-start=\\\"969\\\" data-end=\\\"986\\\">Main Functions<\\\/h2><ol data-start=\\\"988\\\" data-end=\\\"1710\\\"><li data-start=\\\"988\\\" data-end=\\\"1183\\\"><p data-start=\\\"991\\\" data-end=\\\"1183\\\"><strong data-start=\\\"991\\\" data-end=\\\"1016\\\">Protect copper traces<\\\/strong><br data-start=\\\"1016\\\" data-end=\\\"1019\\\" \\\/>Immersion tin forms a tin layer on copper traces. This layer protects copper from oxidation and corrosion. It helps extend the life of the printed circuit board.<\\\/p><\\\/li><li data-start=\\\"1185\\\" data-end=\\\"1365\\\"><p data-start=\\\"1188\\\" data-end=\\\"1365\\\"><strong data-start=\\\"1188\\\" data-end=\\\"1217\\\">Improve soldering quality<\\\/strong><br data-start=\\\"1217\\\" data-end=\\\"1220\\\" \\\/>The tin layer gives good soldering conditions. Solder joints become stronger and more reliable. This raises board performance and reliability.<\\\/p><\\\/li><li data-start=\\\"1367\\\" data-end=\\\"1570\\\"><p data-start=\\\"1370\\\" data-end=\\\"1570\\\"><strong data-start=\\\"1370\\\" data-end=\\\"1403\\\">Enhance electrical properties<\\\/strong><br data-start=\\\"1403\\\" data-end=\\\"1406\\\" \\\/>Tin can improve electrical performance. It can lower resistance and help with capacitance and inductance in some cases. This helps circuits run more efficiently.<\\\/p><\\\/li><li data-start=\\\"1572\\\" data-end=\\\"1710\\\"><p data-start=\\\"1575\\\" data-end=\\\"1710\\\"><strong data-start=\\\"1575\\\" data-end=\\\"1603\\\">Increase wear resistance<\\\/strong><br data-start=\\\"1603\\\" data-end=\\\"1606\\\" \\\/>Tin has decent wear resistance. It protects the board from damage caused by the external environment.<\\\/p><\\\/li><\\\/ol><p><img class=\\\"alignnone size-full wp-image-2832\\\" src=\\\"https:\\\/\\\/flj-pcb.com\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/After-Dip-Soldering-the-backside-of-the-PCB.webp\\\" alt=\\\"After Dip Soldering the backside of the PCB\\\" width=\\\"355\\\" height=\\\"321\\\" \\\/><\\\/p><hr data-start=\\\"1712\\\" data-end=\\\"1715\\\" \\\/><h2 data-start=\\\"1717\\\" data-end=\\\"1741\\\">Application Scenarios<\\\/h2><p data-start=\\\"1742\\\" data-end=\\\"2073\\\">Immersion tin is low cost and simple to operate. It gives clear results. It is widely used in electronics that are cost sensitive and need reasonable soldering performance. Immersion tin also works for cases that need better environmental performance. Compared with immersion gold, immersion tin is more eco-friendly in many cases.<\\\/p><hr data-start=\\\"2075\\\" data-end=\\\"2078\\\" \\\/><h2 data-start=\\\"2080\\\" data-end=\\\"2144\\\">Difference Between PCB Spray Tin and Chemical (Immersion) Tin<\\\/h2><ul data-start=\\\"2146\\\" data-end=\\\"3507\\\"><li data-start=\\\"2146\\\" data-end=\\\"2262\\\"><p data-start=\\\"2148\\\" data-end=\\\"2262\\\"><strong data-start=\\\"2148\\\" data-end=\\\"2203\\\">Spray tin (PCB hot air solder leveling by spraying)<\\\/strong> costs a bit less. This method sprays tin only onto pads.<\\\/p><\\\/li><li data-start=\\\"2263\\\" data-end=\\\"2572\\\"><p data-start=\\\"2265\\\" data-end=\\\"2572\\\"><strong data-start=\\\"2265\\\" data-end=\\\"2297\\\">Chemical tin (immersion tin)<\\\/strong> deposits tin by chemical means on pad areas and includes the surface copper as well. It uses a thin tin layer, usually 10\\u201330 \\u00b5m, mainly to prevent oxidation and to improve SMT solder wetting. Its aim is the same as immersion gold or OSP. SMT requires the board to be tinned.<\\\/p><\\\/li><li data-start=\\\"2574\\\" data-end=\\\"2772\\\"><p data-start=\\\"2576\\\" data-end=\\\"2772\\\"><strong data-start=\\\"2576\\\" data-end=\\\"2589\\\">Spray tin<\\\/strong> uses physical methods to spray a layer of tin. The thickness is usually 50\\u2013150 \\u00b5m, which is thicker. For SMT, no extra tining is needed. Soldering parts with molten solder is enough.<\\\/p><\\\/li><li data-start=\\\"2774\\\" data-end=\\\"3003\\\"><p data-start=\\\"2776\\\" data-end=\\\"3003\\\">The compositions are different. <strong data-start=\\\"2808\\\" data-end=\\\"2824\\\">Chemical tin<\\\/strong> uses tin salts in an acidic tin-containing solution. <strong data-start=\\\"2878\\\" data-end=\\\"2891\\\">Spray tin<\\\/strong> usually uses tin alloys with lead or lead-free blends (pure tin is not used because of its high melting point).<\\\/p><\\\/li><li data-start=\\\"3005\\\" data-end=\\\"3202\\\"><p data-start=\\\"3007\\\" data-end=\\\"3202\\\"><strong data-start=\\\"3007\\\" data-end=\\\"3023\\\">Chemical tin<\\\/strong>, also called immersion tin, is a surface treatment for pad protection like OSP, immersion gold, and immersion silver. It mainly protects the surface copper foil at the pad sites.<\\\/p><\\\/li><li data-start=\\\"3204\\\" data-end=\\\"3507\\\"><p data-start=\\\"3206\\\" data-end=\\\"3507\\\"><strong data-start=\\\"3206\\\" data-end=\\\"3228\\\">Electroplating tin<\\\/strong> (plated tin) is a process used in PCB factories during two-copper procedures. It protects traces and plated-through holes before etching. After etching, the protective tin is removed and production moves on to solder mask printing. Plated tin is not seen in SMT assembly plants.<\\\/p><\\\/li><\\\/ul><hr data-start=\\\"3509\\\" data-end=\\\"3512\\\" \\\/><h2 data-start=\\\"3514\\\" data-end=\\\"3528\\\">Process Flow<\\\/h2><div class=\\\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\\\"><div class=\\\"sticky top-9\\\"><div class=\\\"absolute end-0 bottom-0 flex h-9 items-center pe-2\\\"><div class=\\\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\\\">\\u00a0<\\\/div><\\\/div><\\\/div><div class=\\\"overflow-y-auto p-4\\\" dir=\\\"ltr\\\"><code class=\\\"whitespace-pre!\\\">Board in \\u2192 Degrease \\u2192 Rinse \\u2192 Micro-etch \\u2192 Rinse \\u2192 Activation \\u2192 Pre-dip \\u2192<br \\\/>\\u2192 Immersion Tin <span class=\\\"hljs-selector-tag\\\">A<\\\/span> \\u2192 Immersion Tin <span class=\\\"hljs-selector-tag\\\">B<\\\/span> \\u2192 Hot water rinse \\u2192 Cold water rinse \\u2192 Drain \\u2192 Dry<br \\\/><\\\/code><\\\/div><\\\/div><h3 data-start=\\\"3700\\\" data-end=\\\"3717\\\">Process Notes<\\\/h3><ol data-start=\\\"3719\\\" data-end=\\\"4483\\\"><li data-start=\\\"3719\\\" data-end=\\\"3962\\\"><p data-start=\\\"3722\\\" data-end=\\\"3962\\\"><strong data-start=\\\"3722\\\" data-end=\\\"3765\\\">Acid clean and degrease \\\/ hole cleaning<\\\/strong><br data-start=\\\"3765\\\" data-end=\\\"3768\\\" \\\/>GZ-2061 and GZ-2062 remove organic dirt, fingerprints, and copper oxides from pads and through holes. They prepare a clean copper surface for immersion tin. Materials used: GZ-2061 \\\/ GZ-2062.<\\\/p><\\\/li><li data-start=\\\"3964\\\" data-end=\\\"4110\\\"><p data-start=\\\"3967\\\" data-end=\\\"4110\\\"><strong data-start=\\\"3967\\\" data-end=\\\"3981\\\">Activation<\\\/strong><br data-start=\\\"3981\\\" data-end=\\\"3984\\\" \\\/>GZ-2066 protects the subsequent immersion tin bath. It reduces contamination and extends bath life. Material used: GZ-2066.<\\\/p><\\\/li><li data-start=\\\"4112\\\" data-end=\\\"4299\\\"><p data-start=\\\"4115\\\" data-end=\\\"4299\\\"><strong data-start=\\\"4115\\\" data-end=\\\"4130\\\">Pre-plating<\\\/strong><br data-start=\\\"4130\\\" data-end=\\\"4133\\\" \\\/>Pre-plating applies a thin tin layer on the copper base before immersion tin. This helps get a good final appearance and a dense tin layer. Material used: GZ-2069.<\\\/p><\\\/li><li data-start=\\\"4301\\\" data-end=\\\"4483\\\"><p data-start=\\\"4304\\\" data-end=\\\"4483\\\"><strong data-start=\\\"4304\\\" data-end=\\\"4321\\\">Immersion tin<\\\/strong><br data-start=\\\"4321\\\" data-end=\\\"4324\\\" \\\/>Immersion tin can replace spray tin. It deposits tin on the copper by displacement. The solderability can last more than six months. Material used: GZ-2069.<\\\/p><\\\/li><\\\/ol><hr data-start=\\\"4485\\\" data-end=\\\"4488\\\" \\\/><h2 data-start=\\\"4490\\\" data-end=\\\"4516\\\">Product Characteristics<\\\/h2><p data-start=\\\"4517\\\" data-end=\\\"4701\\\">After immersion tin, boards get a good look and a uniform, dense tin layer with strong adhesion. Typical thickness is 0.8\\u20131.2 \\u00b5m. The tin layer shows no whiskers or dendritic crystals.<\\\/p><hr data-start=\\\"4703\\\" data-end=\\\"4706\\\" \\\/><h2 data-start=\\\"4708\\\" data-end=\\\"4751\\\">Equipment and Tank Material Requirements<\\\/h2><div class=\\\"_tableContainer_1rjym_1\\\"><div class=\\\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"4753\\\" data-end=\\\"5186\\\"><thead data-start=\\\"4753\\\" data-end=\\\"4820\\\"><tr data-start=\\\"4753\\\" data-end=\\\"4820\\\"><th data-start=\\\"4753\\\" data-end=\\\"4760\\\" data-col-size=\\\"sm\\\">Item<\\\/th><th data-start=\\\"4760\\\" data-end=\\\"4781\\\" data-col-size=\\\"sm\\\">Through-hole tanks<\\\/th><th data-start=\\\"4781\\\" data-end=\\\"4800\\\" data-col-size=\\\"sm\\\">Black-hole tanks<\\\/th><th data-start=\\\"4800\\\" data-end=\\\"4820\\\" data-col-size=\\\"md\\\">Micro-etch tanks<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"4842\\\" data-end=\\\"5186\\\"><tr data-start=\\\"4842\\\" data-end=\\\"4917\\\"><td data-start=\\\"4842\\\" data-end=\\\"4854\\\" data-col-size=\\\"sm\\\">Tank body<\\\/td><td data-start=\\\"4854\\\" data-end=\\\"4878\\\" data-col-size=\\\"sm\\\">PE, PP, 304 or 316 SS<\\\/td><td data-start=\\\"4878\\\" data-end=\\\"4896\\\" data-col-size=\\\"sm\\\">PP, PVC, 316 SS<\\\/td><td data-start=\\\"4896\\\" data-end=\\\"4917\\\" data-col-size=\\\"md\\\">PE, PP, rigid PVC<\\\/td><\\\/tr><tr data-start=\\\"4918\\\" data-end=\\\"5000\\\"><td data-start=\\\"4918\\\" data-end=\\\"4928\\\" data-col-size=\\\"sm\\\">Heaters<\\\/td><td data-start=\\\"4928\\\" data-end=\\\"4961\\\" data-col-size=\\\"sm\\\">304 or 316 SS or Teflon-coated<\\\/td><td data-start=\\\"4961\\\" data-end=\\\"4970\\\" data-col-size=\\\"sm\\\">316 SS<\\\/td><td data-start=\\\"4970\\\" data-end=\\\"5000\\\" data-col-size=\\\"md\\\">316 SS or titanium heaters<\\\/td><\\\/tr><tr data-start=\\\"5001\\\" data-end=\\\"5067\\\"><td data-start=\\\"5001\\\" data-end=\\\"5014\\\" data-col-size=\\\"sm\\\">Filtration<\\\/td><td data-start=\\\"5014\\\" data-end=\\\"5038\\\" data-col-size=\\\"sm\\\">Continuous filtration<\\\/td><td data-start=\\\"5038\\\" data-end=\\\"5042\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"5042\\\" data-end=\\\"5067\\\" data-col-size=\\\"md\\\">Continuous filtration<\\\/td><\\\/tr><tr data-start=\\\"5068\\\" data-end=\\\"5186\\\"><td data-start=\\\"5068\\\" data-end=\\\"5080\\\" data-col-size=\\\"sm\\\">Agitation<\\\/td><td data-start=\\\"5080\\\" data-end=\\\"5110\\\" data-col-size=\\\"sm\\\">Mechanical swing, vibration<\\\/td><td data-start=\\\"5110\\\" data-end=\\\"5140\\\" data-col-size=\\\"sm\\\">Mechanical swing, vibration<\\\/td><td data-start=\\\"5140\\\" data-end=\\\"5186\\\" data-col-size=\\\"md\\\">Mechanical swing, vibration, air agitation<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><hr data-start=\\\"5188\\\" data-end=\\\"5191\\\" \\\/><h2 data-start=\\\"5193\\\" data-end=\\\"5210\\\">Process Control<\\\/h2><h3 data-start=\\\"5212\\\" data-end=\\\"5252\\\">1. Bath startup (making the solution)<\\\/h3><div class=\\\"_tableContainer_1rjym_1\\\"><div class=\\\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"5253\\\" data-end=\\\"5812\\\"><thead data-start=\\\"5253\\\" data-end=\\\"5332\\\"><tr data-start=\\\"5253\\\" data-end=\\\"5332\\\"><th data-start=\\\"5253\\\" data-end=\\\"5265\\\" data-col-size=\\\"sm\\\">Tank name<\\\/th><th data-start=\\\"5265\\\" data-end=\\\"5276\\\" data-col-size=\\\"sm\\\">Chemical<\\\/th><th data-start=\\\"5276\\\" data-end=\\\"5290\\\" data-col-size=\\\"sm\\\">Tank volume<\\\/th><th data-start=\\\"5290\\\" data-end=\\\"5314\\\" data-col-size=\\\"sm\\\">Startup concentration<\\\/th><th data-start=\\\"5314\\\" data-end=\\\"5332\\\" data-col-size=\\\"sm\\\">Startup amount<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"5358\\\" data-end=\\\"5812\\\"><tr data-start=\\\"5358\\\" data-end=\\\"5404\\\"><td data-start=\\\"5358\\\" data-end=\\\"5369\\\" data-col-size=\\\"sm\\\">Degrease<\\\/td><td data-start=\\\"5369\\\" data-end=\\\"5379\\\" data-col-size=\\\"sm\\\">GZ-2061<\\\/td><td data-start=\\\"5379\\\" data-end=\\\"5387\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5387\\\" data-end=\\\"5397\\\" data-col-size=\\\"sm\\\">50 mL\\\/L<\\\/td><td data-start=\\\"5397\\\" data-end=\\\"5404\\\" data-col-size=\\\"sm\\\">5 L<\\\/td><\\\/tr><tr data-start=\\\"5405\\\" data-end=\\\"5444\\\"><td data-start=\\\"5405\\\" data-end=\\\"5408\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"5408\\\" data-end=\\\"5418\\\" data-col-size=\\\"sm\\\">GZ-2062<\\\/td><td data-start=\\\"5418\\\" data-end=\\\"5426\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5426\\\" data-end=\\\"5434\\\" data-col-size=\\\"sm\\\">2 g\\\/L<\\\/td><td data-start=\\\"5434\\\" data-end=\\\"5444\\\" data-col-size=\\\"sm\\\">0.2 Kg<\\\/td><\\\/tr><tr data-start=\\\"5445\\\" data-end=\\\"5481\\\"><td data-start=\\\"5445\\\" data-end=\\\"5448\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"5448\\\" data-end=\\\"5456\\\" data-col-size=\\\"sm\\\">H\\u2082SO\\u2084<\\\/td><td data-start=\\\"5456\\\" data-end=\\\"5464\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5464\\\" data-end=\\\"5474\\\" data-col-size=\\\"sm\\\">50 mL\\\/L<\\\/td><td data-start=\\\"5474\\\" data-end=\\\"5481\\\" data-col-size=\\\"sm\\\">5 L<\\\/td><\\\/tr><tr data-start=\\\"5482\\\" data-end=\\\"5530\\\"><td data-start=\\\"5482\\\" data-end=\\\"5495\\\" data-col-size=\\\"sm\\\">Micro-etch<\\\/td><td data-start=\\\"5495\\\" data-end=\\\"5503\\\" data-col-size=\\\"sm\\\">H\\u2082SO\\u2084<\\\/td><td data-start=\\\"5503\\\" data-end=\\\"5511\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5511\\\" data-end=\\\"5521\\\" data-col-size=\\\"sm\\\">25 mL\\\/L<\\\/td><td data-start=\\\"5521\\\" data-end=\\\"5530\\\" data-col-size=\\\"sm\\\">2.5 L<\\\/td><\\\/tr><tr data-start=\\\"5531\\\" data-end=\\\"5569\\\"><td data-start=\\\"5531\\\" data-end=\\\"5534\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"5534\\\" data-end=\\\"5544\\\" data-col-size=\\\"sm\\\">GZ-2065<\\\/td><td data-start=\\\"5544\\\" data-end=\\\"5552\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5552\\\" data-end=\\\"5561\\\" data-col-size=\\\"sm\\\">20 g\\\/L<\\\/td><td data-start=\\\"5561\\\" data-end=\\\"5569\\\" data-col-size=\\\"sm\\\">2 Kg<\\\/td><\\\/tr><tr data-start=\\\"5570\\\" data-end=\\\"5606\\\"><td data-start=\\\"5570\\\" data-end=\\\"5573\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"5573\\\" data-end=\\\"5579\\\" data-col-size=\\\"sm\\\">SPS<\\\/td><td data-start=\\\"5579\\\" data-end=\\\"5587\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5587\\\" data-end=\\\"5597\\\" data-col-size=\\\"sm\\\">100 g\\\/L<\\\/td><td data-start=\\\"5597\\\" data-end=\\\"5606\\\" data-col-size=\\\"sm\\\">10 Kg<\\\/td><\\\/tr><tr data-start=\\\"5607\\\" data-end=\\\"5657\\\"><td data-start=\\\"5607\\\" data-end=\\\"5620\\\" data-col-size=\\\"sm\\\">Activation<\\\/td><td data-start=\\\"5620\\\" data-end=\\\"5630\\\" data-col-size=\\\"sm\\\">GZ-2066<\\\/td><td data-start=\\\"5630\\\" data-end=\\\"5638\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5638\\\" data-end=\\\"5649\\\" data-col-size=\\\"sm\\\">150 mL\\\/L<\\\/td><td data-start=\\\"5649\\\" data-end=\\\"5657\\\" data-col-size=\\\"sm\\\">15 L<\\\/td><\\\/tr><tr data-start=\\\"5658\\\" data-end=\\\"5706\\\"><td data-start=\\\"5658\\\" data-end=\\\"5672\\\" data-col-size=\\\"sm\\\">Pre-plating<\\\/td><td data-start=\\\"5672\\\" data-end=\\\"5682\\\" data-col-size=\\\"sm\\\">GZ-2069<\\\/td><td data-start=\\\"5682\\\" data-end=\\\"5690\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5690\\\" data-end=\\\"5697\\\" data-col-size=\\\"sm\\\">100%<\\\/td><td data-start=\\\"5697\\\" data-end=\\\"5706\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><\\\/tr><tr data-start=\\\"5707\\\" data-end=\\\"5759\\\"><td data-start=\\\"5707\\\" data-end=\\\"5725\\\" data-col-size=\\\"sm\\\">Immersion Tin A<\\\/td><td data-start=\\\"5725\\\" data-end=\\\"5735\\\" data-col-size=\\\"sm\\\">GZ-2069<\\\/td><td data-start=\\\"5735\\\" data-end=\\\"5743\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5743\\\" data-end=\\\"5750\\\" data-col-size=\\\"sm\\\">100%<\\\/td><td data-start=\\\"5750\\\" data-end=\\\"5759\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><\\\/tr><tr data-start=\\\"5760\\\" data-end=\\\"5812\\\"><td data-start=\\\"5760\\\" data-end=\\\"5778\\\" data-col-size=\\\"sm\\\">Immersion Tin B<\\\/td><td data-start=\\\"5778\\\" data-end=\\\"5788\\\" data-col-size=\\\"sm\\\">GZ-2069<\\\/td><td data-start=\\\"5788\\\" data-end=\\\"5796\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><td data-start=\\\"5796\\\" data-end=\\\"5803\\\" data-col-size=\\\"sm\\\">100%<\\\/td><td data-start=\\\"5803\\\" data-end=\\\"5812\\\" data-col-size=\\\"sm\\\">100 L<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><h3 data-start=\\\"5814\\\" data-end=\\\"5840\\\">2. Operating Conditions<\\\/h3><div class=\\\"_tableContainer_1rjym_1\\\"><div class=\\\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"5841\\\" data-end=\\\"6755\\\"><thead data-start=\\\"5841\\\" data-end=\\\"5930\\\"><tr data-start=\\\"5841\\\" data-end=\\\"5930\\\"><th data-start=\\\"5841\\\" data-end=\\\"5848\\\" data-col-size=\\\"sm\\\">Bath<\\\/th><th data-start=\\\"5848\\\" data-end=\\\"5864\\\" data-col-size=\\\"sm\\\">Analysis item<\\\/th><th data-start=\\\"5864\\\" data-end=\\\"5880\\\" data-col-size=\\\"sm\\\">Control range<\\\/th><th data-start=\\\"5880\\\" data-end=\\\"5896\\\" data-col-size=\\\"sm\\\">Analysis freq<\\\/th><th data-start=\\\"5896\\\" data-end=\\\"5903\\\" data-col-size=\\\"sm\\\">Temp<\\\/th><th data-start=\\\"5903\\\" data-end=\\\"5916\\\" data-col-size=\\\"sm\\\">Time (min)<\\\/th><th data-start=\\\"5916\\\" data-end=\\\"5930\\\" data-col-size=\\\"sm\\\">Filtration<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"5966\\\" data-end=\\\"6755\\\"><tr data-start=\\\"5966\\\" data-end=\\\"6031\\\"><td data-start=\\\"5966\\\" data-end=\\\"5977\\\" data-col-size=\\\"sm\\\">Degrease<\\\/td><td data-start=\\\"5977\\\" data-end=\\\"5985\\\" data-col-size=\\\"sm\\\">H\\u2082SO\\u2084<\\\/td><td data-start=\\\"5985\\\" data-end=\\\"5998\\\" data-col-size=\\\"sm\\\">40\\u201350 mL\\\/L<\\\/td><td data-start=\\\"5998\\\" data-end=\\\"6009\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6009\\\" data-end=\\\"6018\\\" data-col-size=\\\"sm\\\">40\\u201350\\u2103<\\\/td><td data-start=\\\"6018\\\" data-end=\\\"6024\\\" data-col-size=\\\"sm\\\">3\\u20135<\\\/td><td data-start=\\\"6024\\\" data-end=\\\"6031\\\" data-col-size=\\\"sm\\\">Yes<\\\/td><\\\/tr><tr data-start=\\\"6032\\\" data-end=\\\"6099\\\"><td data-start=\\\"6032\\\" data-end=\\\"6045\\\" data-col-size=\\\"sm\\\">Micro-etch<\\\/td><td data-start=\\\"6045\\\" data-end=\\\"6053\\\" data-col-size=\\\"sm\\\">H\\u2082SO\\u2084<\\\/td><td data-start=\\\"6053\\\" data-end=\\\"6066\\\" data-col-size=\\\"sm\\\">20\\u201325 mL\\\/L<\\\/td><td data-start=\\\"6066\\\" data-end=\\\"6077\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6077\\\" data-end=\\\"6086\\\" data-col-size=\\\"sm\\\">20\\u201330\\u2103<\\\/td><td data-start=\\\"6086\\\" data-end=\\\"6092\\\" data-col-size=\\\"sm\\\">1\\u20132<\\\/td><td data-start=\\\"6092\\\" data-end=\\\"6099\\\" data-col-size=\\\"sm\\\">Yes<\\\/td><\\\/tr><tr data-start=\\\"6100\\\" data-end=\\\"6146\\\"><td data-start=\\\"6100\\\" data-end=\\\"6103\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"6103\\\" data-end=\\\"6109\\\" data-col-size=\\\"sm\\\">SPS<\\\/td><td data-start=\\\"6109\\\" data-end=\\\"6122\\\" data-col-size=\\\"sm\\\">80\\u2013120 g\\\/L<\\\/td><td data-start=\\\"6122\\\" data-end=\\\"6133\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6133\\\" data-end=\\\"6137\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6137\\\" data-end=\\\"6141\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6141\\\" data-end=\\\"6146\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"6147\\\" data-end=\\\"6207\\\"><td data-start=\\\"6147\\\" data-end=\\\"6150\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"6150\\\" data-end=\\\"6168\\\" data-col-size=\\\"sm\\\">Micro-etch rate<\\\/td><td data-start=\\\"6168\\\" data-end=\\\"6181\\\" data-col-size=\\\"sm\\\">0.5\\u20131.5 \\u00b5m<\\\/td><td data-start=\\\"6181\\\" data-end=\\\"6194\\\" data-col-size=\\\"sm\\\">once\\\/shift<\\\/td><td data-start=\\\"6194\\\" data-end=\\\"6198\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6198\\\" data-end=\\\"6202\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6202\\\" data-end=\\\"6207\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"6208\\\" data-end=\\\"6252\\\"><td data-start=\\\"6208\\\" data-end=\\\"6211\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"6211\\\" data-end=\\\"6218\\\" data-col-size=\\\"sm\\\">Cu\\u00b2\\u207a<\\\/td><td data-start=\\\"6218\\\" data-end=\\\"6228\\\" data-col-size=\\\"sm\\\">&lt;20 g\\\/L<\\\/td><td data-start=\\\"6228\\\" data-end=\\\"6239\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6239\\\" data-end=\\\"6243\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6243\\\" data-end=\\\"6247\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6247\\\" data-end=\\\"6252\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"6253\\\" data-end=\\\"6322\\\"><td data-start=\\\"6253\\\" data-end=\\\"6266\\\" data-col-size=\\\"sm\\\">Activation<\\\/td><td data-start=\\\"6266\\\" data-end=\\\"6277\\\" data-col-size=\\\"sm\\\">Acid eq.<\\\/td><td data-start=\\\"6277\\\" data-end=\\\"6289\\\" data-col-size=\\\"sm\\\">0.1\\u20130.2 N<\\\/td><td data-start=\\\"6289\\\" data-end=\\\"6300\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6300\\\" data-end=\\\"6309\\\" data-col-size=\\\"sm\\\">22\\u201332\\u2103<\\\/td><td data-start=\\\"6309\\\" data-end=\\\"6315\\\" data-col-size=\\\"sm\\\">1\\u20132<\\\/td><td data-start=\\\"6315\\\" data-end=\\\"6322\\\" data-col-size=\\\"sm\\\">Yes<\\\/td><\\\/tr><tr data-start=\\\"6323\\\" data-end=\\\"6393\\\"><td data-start=\\\"6323\\\" data-end=\\\"6337\\\" data-col-size=\\\"sm\\\">Pre-plating<\\\/td><td data-start=\\\"6337\\\" data-end=\\\"6348\\\" data-col-size=\\\"sm\\\">Acid eq.<\\\/td><td data-start=\\\"6348\\\" data-end=\\\"6360\\\" data-col-size=\\\"sm\\\">2.0\\u20134.0 N<\\\/td><td data-start=\\\"6360\\\" data-end=\\\"6371\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6371\\\" data-end=\\\"6380\\\" data-col-size=\\\"sm\\\">36\\u201340\\u2103<\\\/td><td data-start=\\\"6380\\\" data-end=\\\"6386\\\" data-col-size=\\\"sm\\\">1\\u20132<\\\/td><td data-start=\\\"6386\\\" data-end=\\\"6393\\\" data-col-size=\\\"sm\\\">Yes<\\\/td><\\\/tr><tr data-start=\\\"6394\\\" data-end=\\\"6439\\\"><td data-start=\\\"6394\\\" data-end=\\\"6397\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"6397\\\" data-end=\\\"6410\\\" data-col-size=\\\"sm\\\">Sn content<\\\/td><td data-start=\\\"6410\\\" data-end=\\\"6422\\\" data-col-size=\\\"sm\\\">12\\u201316 g\\\/L<\\\/td><td data-start=\\\"6422\\\" data-end=\\\"6426\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6426\\\" data-end=\\\"6430\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6430\\\" data-end=\\\"6434\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6434\\\" data-end=\\\"6439\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"6440\\\" data-end=\\\"6515\\\"><td data-start=\\\"6440\\\" data-end=\\\"6458\\\" data-col-size=\\\"sm\\\">Immersion Tin A<\\\/td><td data-start=\\\"6458\\\" data-end=\\\"6469\\\" data-col-size=\\\"sm\\\">Acid eq.<\\\/td><td data-start=\\\"6469\\\" data-end=\\\"6481\\\" data-col-size=\\\"sm\\\">2.0\\u20134.0 N<\\\/td><td data-start=\\\"6481\\\" data-end=\\\"6492\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6492\\\" data-end=\\\"6501\\\" data-col-size=\\\"sm\\\">50\\u201360\\u2103<\\\/td><td data-start=\\\"6501\\\" data-end=\\\"6508\\\" data-col-size=\\\"sm\\\">5\\u201310<\\\/td><td data-start=\\\"6508\\\" data-end=\\\"6515\\\" data-col-size=\\\"sm\\\">Yes<\\\/td><\\\/tr><tr data-start=\\\"6516\\\" data-end=\\\"6568\\\"><td data-start=\\\"6516\\\" data-end=\\\"6519\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"6519\\\" data-end=\\\"6532\\\" data-col-size=\\\"sm\\\">Sn content<\\\/td><td data-start=\\\"6532\\\" data-end=\\\"6544\\\" data-col-size=\\\"sm\\\">12\\u201316 g\\\/L<\\\/td><td data-start=\\\"6544\\\" data-end=\\\"6555\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6555\\\" data-end=\\\"6559\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6559\\\" data-end=\\\"6563\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6563\\\" data-end=\\\"6568\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"6569\\\" data-end=\\\"6645\\\"><td data-start=\\\"6569\\\" data-end=\\\"6587\\\" data-col-size=\\\"sm\\\">Immersion Tin B<\\\/td><td data-start=\\\"6587\\\" data-end=\\\"6598\\\" data-col-size=\\\"sm\\\">Acid eq.<\\\/td><td data-start=\\\"6598\\\" data-end=\\\"6610\\\" data-col-size=\\\"sm\\\">2.0\\u20134.0 N<\\\/td><td data-start=\\\"6610\\\" data-end=\\\"6621\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6621\\\" data-end=\\\"6630\\\" data-col-size=\\\"sm\\\">68\\u201372\\u2103<\\\/td><td data-start=\\\"6630\\\" data-end=\\\"6638\\\" data-col-size=\\\"sm\\\">10\\u201312<\\\/td><td data-start=\\\"6638\\\" data-end=\\\"6645\\\" data-col-size=\\\"sm\\\">Yes<\\\/td><\\\/tr><tr data-start=\\\"6646\\\" data-end=\\\"6698\\\"><td data-start=\\\"6646\\\" data-end=\\\"6649\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"6649\\\" data-end=\\\"6662\\\" data-col-size=\\\"sm\\\">Sn content<\\\/td><td data-start=\\\"6662\\\" data-end=\\\"6674\\\" data-col-size=\\\"sm\\\">12\\u201316 g\\\/L<\\\/td><td data-start=\\\"6674\\\" data-end=\\\"6685\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6685\\\" data-end=\\\"6689\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6689\\\" data-end=\\\"6693\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6693\\\" data-end=\\\"6698\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"6699\\\" data-end=\\\"6755\\\"><td data-start=\\\"6699\\\" data-end=\\\"6702\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"6702\\\" data-end=\\\"6718\\\" data-col-size=\\\"sm\\\">Tin thickness<\\\/td><td data-start=\\\"6718\\\" data-end=\\\"6731\\\" data-col-size=\\\"sm\\\">0.8\\u20131.2 \\u00b5m<\\\/td><td data-start=\\\"6731\\\" data-end=\\\"6742\\\" data-col-size=\\\"sm\\\">once\\\/day<\\\/td><td data-start=\\\"6742\\\" data-end=\\\"6746\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6746\\\" data-end=\\\"6750\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"6750\\\" data-end=\\\"6755\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><hr data-start=\\\"6757\\\" data-end=\\\"6760\\\" \\\/><h3 data-start=\\\"6762\\\" data-end=\\\"6808\\\">3. Bath Replenishment and Replacement Rules<\\\/h3><div class=\\\"_tableContainer_1rjym_1\\\"><div class=\\\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\\\" tabindex=\\\"-1\\\"><table class=\\\"w-fit min-w-(--thread-content-width)\\\" data-start=\\\"6810\\\" data-end=\\\"7466\\\"><thead data-start=\\\"6810\\\" data-end=\\\"6876\\\"><tr data-start=\\\"6810\\\" data-end=\\\"6876\\\"><th data-start=\\\"6810\\\" data-end=\\\"6817\\\" data-col-size=\\\"sm\\\">Bath<\\\/th><th data-start=\\\"6817\\\" data-end=\\\"6828\\\" data-col-size=\\\"sm\\\">Chemical<\\\/th><th data-start=\\\"6828\\\" data-end=\\\"6840\\\" data-col-size=\\\"sm\\\">Replenish<\\\/th><th data-start=\\\"6840\\\" data-end=\\\"6859\\\" data-col-size=\\\"sm\\\">Replace standard<\\\/th><th data-start=\\\"6859\\\" data-end=\\\"6876\\\" data-col-size=\\\"sm\\\">Filter change<\\\/th><\\\/tr><\\\/thead><tbody data-start=\\\"6901\\\" data-end=\\\"7466\\\"><tr data-start=\\\"6901\\\" data-end=\\\"7002\\\"><td data-start=\\\"6901\\\" data-end=\\\"6912\\\" data-col-size=\\\"sm\\\">Degrease<\\\/td><td data-start=\\\"6912\\\" data-end=\\\"6920\\\" data-col-size=\\\"sm\\\">H\\u2082SO\\u2084<\\\/td><td data-start=\\\"6920\\\" data-end=\\\"6938\\\" data-col-size=\\\"sm\\\">Add by analysis<\\\/td><td data-start=\\\"6938\\\" data-end=\\\"6978\\\" data-col-size=\\\"sm\\\">Replace when treat 40\\u201350 m\\u00b2 of boards<\\\/td><td data-start=\\\"6978\\\" data-end=\\\"7002\\\" data-col-size=\\\"sm\\\">Change filter weekly<\\\/td><\\\/tr><tr data-start=\\\"7003\\\" data-end=\\\"7095\\\"><td data-start=\\\"7003\\\" data-end=\\\"7016\\\" data-col-size=\\\"sm\\\">Micro-etch<\\\/td><td data-start=\\\"7016\\\" data-end=\\\"7024\\\" data-col-size=\\\"sm\\\">H\\u2082SO\\u2084<\\\/td><td data-start=\\\"7024\\\" data-end=\\\"7042\\\" data-col-size=\\\"sm\\\">Add by analysis<\\\/td><td data-start=\\\"7042\\\" data-end=\\\"7071\\\" data-col-size=\\\"sm\\\">Replace when Cu\\u00b2\\u207a &gt; 20 g\\\/L<\\\/td><td data-start=\\\"7071\\\" data-end=\\\"7095\\\" data-col-size=\\\"sm\\\">Change filter weekly<\\\/td><\\\/tr><tr data-start=\\\"7096\\\" data-end=\\\"7132\\\"><td data-start=\\\"7096\\\" data-end=\\\"7099\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"7099\\\" data-end=\\\"7105\\\" data-col-size=\\\"sm\\\">SPS<\\\/td><td data-start=\\\"7105\\\" data-end=\\\"7123\\\" data-col-size=\\\"sm\\\">Add by analysis<\\\/td><td data-start=\\\"7123\\\" data-end=\\\"7127\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"7127\\\" data-end=\\\"7132\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"7133\\\" data-end=\\\"7203\\\"><td data-start=\\\"7133\\\" data-end=\\\"7146\\\" data-col-size=\\\"sm\\\">Activation<\\\/td><td data-start=\\\"7146\\\" data-end=\\\"7157\\\" data-col-size=\\\"sm\\\">Acid eq.<\\\/td><td data-start=\\\"7157\\\" data-end=\\\"7175\\\" data-col-size=\\\"sm\\\">Add by analysis<\\\/td><td data-start=\\\"7175\\\" data-end=\\\"7179\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"7179\\\" data-end=\\\"7203\\\" data-col-size=\\\"sm\\\">Change filter weekly<\\\/td><\\\/tr><tr data-start=\\\"7204\\\" data-end=\\\"7298\\\"><td data-start=\\\"7204\\\" data-end=\\\"7218\\\" data-col-size=\\\"sm\\\">Pre-plating<\\\/td><td data-start=\\\"7218\\\" data-end=\\\"7222\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"7222\\\" data-end=\\\"7240\\\" data-col-size=\\\"sm\\\">Add by analysis<\\\/td><td data-start=\\\"7240\\\" data-end=\\\"7268\\\" data-col-size=\\\"sm\\\">Replace when Cu\\u00b2\\u207a &gt; 8 g\\\/L<\\\/td><td data-start=\\\"7268\\\" data-end=\\\"7298\\\" data-col-size=\\\"sm\\\">Change filter every 2 days<\\\/td><\\\/tr><tr data-start=\\\"7299\\\" data-end=\\\"7328\\\"><td data-start=\\\"7299\\\" data-end=\\\"7302\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"7302\\\" data-end=\\\"7315\\\" data-col-size=\\\"sm\\\">Sn content<\\\/td><td data-start=\\\"7315\\\" data-end=\\\"7319\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"7319\\\" data-end=\\\"7323\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"7323\\\" data-end=\\\"7328\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><tr data-start=\\\"7329\\\" data-end=\\\"7436\\\"><td data-start=\\\"7329\\\" data-end=\\\"7345\\\" data-col-size=\\\"sm\\\">Immersion tin<\\\/td><td data-start=\\\"7345\\\" data-end=\\\"7360\\\" data-col-size=\\\"sm\\\">Acid content<\\\/td><td data-start=\\\"7360\\\" data-end=\\\"7378\\\" data-col-size=\\\"sm\\\">Add by analysis<\\\/td><td data-start=\\\"7378\\\" data-end=\\\"7406\\\" data-col-size=\\\"sm\\\">Replace when Cu\\u00b2\\u207a &gt; 8 g\\\/L<\\\/td><td data-start=\\\"7406\\\" data-end=\\\"7436\\\" data-col-size=\\\"sm\\\">Change filter every 2 days<\\\/td><\\\/tr><tr data-start=\\\"7437\\\" data-end=\\\"7466\\\"><td data-start=\\\"7437\\\" data-end=\\\"7440\\\" data-col-size=\\\"sm\\\">\\u00a0<\\\/td><td data-start=\\\"7440\\\" data-end=\\\"7453\\\" data-col-size=\\\"sm\\\">Sn content<\\\/td><td data-start=\\\"7453\\\" data-end=\\\"7457\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"7457\\\" data-end=\\\"7461\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><td data-start=\\\"7461\\\" data-end=\\\"7466\\\" data-col-size=\\\"sm\\\">\\u2014<\\\/td><\\\/tr><\\\/tbody><\\\/table><\\\/div><\\\/div><hr data-start=\\\"7468\\\" data-end=\\\"7471\\\" \\\/><h3 data-start=\\\"7473\\\" data-end=\\\"7497\\\">4. Storage Conditions<\\\/h3><ul data-start=\\\"7498\\\" data-end=\\\"7625\\\"><li data-start=\\\"7498\\\" data-end=\\\"7594\\\"><p data-start=\\\"7500\\\" data-end=\\\"7594\\\">GZ-2001, GZ-2002, GZ-2004: avoid direct sunlight. Shelf life two years. Store at -5\\u2103 to 40\\u2103.<\\\/p><\\\/li><li data-start=\\\"7595\\\" data-end=\\\"7625\\\"><p data-start=\\\"7597\\\" data-end=\\\"7625\\\">GZ-2003: store at 3\\u2103 to 30\\u2103.<\\\/p><\\\/li><\\\/ul><hr data-start=\\\"7627\\\" data-end=\\\"7630\\\" \\\/><h3 data-start=\\\"7632\\\" data-end=\\\"7658\\\">5. Wastewater Treatment<\\\/h3><ul data-start=\\\"7659\\\" data-end=\\\"8103\\\"><li data-start=\\\"7659\\\" data-end=\\\"7741\\\"><p data-start=\\\"7661\\\" data-end=\\\"7741\\\">Clean tank waste: neutralize with acid then discharge per environmental rules.<\\\/p><\\\/li><li data-start=\\\"7742\\\" data-end=\\\"7817\\\"><p data-start=\\\"7744\\\" data-end=\\\"7817\\\">Through-hole tank waste: neutralize with acid then discharge per rules.<\\\/p><\\\/li><li data-start=\\\"7818\\\" data-end=\\\"7881\\\"><p data-start=\\\"7820\\\" data-end=\\\"7881\\\">Activation tank waste: neutralize then discharge per rules.<\\\/p><\\\/li><li data-start=\\\"7882\\\" data-end=\\\"7960\\\"><p data-start=\\\"7884\\\" data-end=\\\"7960\\\">Immersion tin tank waste: neutralize with alkali then discharge per rules.<\\\/p><\\\/li><li data-start=\\\"7961\\\" data-end=\\\"8103\\\"><p data-start=\\\"7963\\\" data-end=\\\"8103\\\">Micro-etch waste: recover copper sulfate by electro-purification and recrystallization. Then neutralize with alkali and discharge per rules.<\\\/p><\\\/li><\\\/ul><hr data-start=\\\"8105\\\" data-end=\\\"8108\\\" \\\/><h2 data-start=\\\"8110\\\" data-end=\\\"8136\\\">Reagent Analysis Methods<\\\/h2><h3 data-start=\\\"8138\\\" data-end=\\\"8168\\\">1. H\\u2082SO\\u2084 in micro-etch bath<\\\/h3><p data-start=\\\"8169\\\" data-end=\\\"8183\\\"><strong data-start=\\\"8169\\\" data-end=\\\"8181\\\">Reagents<\\\/strong><\\\/p><ol data-start=\\\"8184\\\" data-end=\\\"8261\\\"><li data-start=\\\"8184\\\" data-end=\\\"8229\\\"><p data-start=\\\"8187\\\" data-end=\\\"8229\\\">NaOH standard solution [c(NaOH)=1 mol\\\/L]<\\\/p><\\\/li><li data-start=\\\"8230\\\" data-end=\\\"8261\\\"><p data-start=\\\"8233\\\" data-end=\\\"8261\\\">0.1% methyl orange indicator<\\\/p><\\\/li><\\\/ol><p data-start=\\\"8263\\\" data-end=\\\"8274\\\"><strong data-start=\\\"8263\\\" data-end=\\\"8272\\\">Steps<\\\/strong><\\\/p><ol data-start=\\\"8275\\\" data-end=\\\"8478\\\"><li data-start=\\\"8275\\\" data-end=\\\"8335\\\"><p data-start=\\\"8278\\\" data-end=\\\"8335\\\">Take 5 mL of tank solution into a 250 mL conical flask.<\\\/p><\\\/li><li data-start=\\\"8336\\\" data-end=\\\"8390\\\"><p data-start=\\\"8339\\\" data-end=\\\"8390\\\">Add 50 mL pure water and 2\\u20135 drops methyl orange.<\\\/p><\\\/li><li data-start=\\\"8391\\\" data-end=\\\"8478\\\"><p data-start=\\\"8394\\\" data-end=\\\"8478\\\">Titrate with NaOH (1 mol\\\/L) until color changes from red to yellow. Record volume V.<\\\/p><\\\/li><\\\/ol><p data-start=\\\"8480\\\" data-end=\\\"8599\\\"><strong data-start=\\\"8480\\\" data-end=\\\"8495\\\">Calculation<\\\/strong><br data-start=\\\"8495\\\" data-end=\\\"8498\\\" \\\/>H\\u2082SO\\u2084 (mL\\\/L) = 5.43 \\u00d7 c \\u00d7 V<br data-start=\\\"8525\\\" data-end=\\\"8528\\\" \\\/>c = actual concentration of NaOH (mol\\\/L)<br data-start=\\\"8568\\\" data-end=\\\"8571\\\" \\\/>V = volume of NaOH used (mL)<\\\/p><p data-start=\\\"8601\\\" data-end=\\\"8670\\\"><strong data-start=\\\"8601\\\" data-end=\\\"8608\\\">Add<\\\/strong><br data-start=\\\"8608\\\" data-end=\\\"8611\\\" \\\/>H\\u2082SO\\u2084 (mL) = (set value \\u2013 analysis value) \\u00d7 tank volume (L)<\\\/p><hr data-start=\\\"8672\\\" data-end=\\\"8675\\\" \\\/><h3 data-start=\\\"8677\\\" data-end=\\\"8705\\\">2. SPS in micro-etch bath<\\\/h3><p data-start=\\\"8706\\\" data-end=\\\"8720\\\"><strong data-start=\\\"8706\\\" data-end=\\\"8718\\\">Reagents<\\\/strong><\\\/p><ol data-start=\\\"8721\\\" data-end=\\\"8831\\\"><li data-start=\\\"8721\\\" data-end=\\\"8785\\\"><p data-start=\\\"8724\\\" data-end=\\\"8785\\\">Sodium thiosulfate standard solution [c(Na\\u2082S\\u2082O\\u2083)=0.1 mol\\\/L]<\\\/p><\\\/li><li data-start=\\\"8786\\\" data-end=\\\"8810\\\"><p data-start=\\\"8789\\\" data-end=\\\"8810\\\">1% starch indicator<\\\/p><\\\/li><li data-start=\\\"8811\\\" data-end=\\\"8818\\\"><p data-start=\\\"8814\\\" data-end=\\\"8818\\\">KI<\\\/p><\\\/li><li data-start=\\\"8819\\\" data-end=\\\"8831\\\"><p data-start=\\\"8822\\\" data-end=\\\"8831\\\">20% H\\u2082SO\\u2084<\\\/p><\\\/li><\\\/ol><p data-start=\\\"8833\\\" data-end=\\\"8844\\\"><strong data-start=\\\"8833\\\" data-end=\\\"8842\\\">Steps<\\\/strong><\\\/p><ol data-start=\\\"8845\\\" data-end=\\\"9107\\\"><li data-start=\\\"8845\\\" data-end=\\\"8895\\\"><p data-start=\\\"8848\\\" data-end=\\\"8895\\\">Take 2 mL of tank solution in a 250 mL flask.<\\\/p><\\\/li><li data-start=\\\"8896\\\" data-end=\\\"8971\\\"><p data-start=\\\"8899\\\" data-end=\\\"8971\\\">Add 50 mL pure water, 5 mL 20% H\\u2082SO\\u2084, 2 g KI, keep in dark for 20 min.<\\\/p><\\\/li><li data-start=\\\"8972\\\" data-end=\\\"9051\\\"><p data-start=\\\"8975\\\" data-end=\\\"9051\\\">Titrate with Na\\u2082S\\u2082O\\u2083 until light yellow. Add a few drops starch indicator.<\\\/p><\\\/li><li data-start=\\\"9052\\\" data-end=\\\"9107\\\"><p data-start=\\\"9055\\\" data-end=\\\"9107\\\">Continue titration until colorless. Record volume V.<\\\/p><\\\/li><\\\/ol><p data-start=\\\"9109\\\" data-end=\\\"9149\\\"><strong data-start=\\\"9109\\\" data-end=\\\"9124\\\">Calculation<\\\/strong><br data-start=\\\"9124\\\" data-end=\\\"9127\\\" \\\/>SPS (g\\\/L) = 60 \\u00d7 c \\u00d7 V<\\\/p><p data-start=\\\"9151\\\" data-end=\\\"9230\\\"><strong data-start=\\\"9151\\\" data-end=\\\"9158\\\">Add<\\\/strong><br data-start=\\\"9158\\\" data-end=\\\"9161\\\" \\\/>Total SPS (g) to add = (set value \\u2013 analysis value) \\u00d7 tank volume (L)<\\\/p><hr data-start=\\\"9232\\\" data-end=\\\"9235\\\" \\\/><h3 data-start=\\\"9237\\\" data-end=\\\"9266\\\">3. Cu\\u00b2\\u207a in micro-etch bath<\\\/h3><p data-start=\\\"9267\\\" data-end=\\\"9281\\\"><strong data-start=\\\"9267\\\" data-end=\\\"9279\\\">Reagents<\\\/strong><\\\/p><ol data-start=\\\"9282\\\" data-end=\\\"9394\\\"><li data-start=\\\"9282\\\" data-end=\\\"9328\\\"><p data-start=\\\"9285\\\" data-end=\\\"9328\\\">EDTA-2Na standard solution [c=0.05 mol\\\/L]<\\\/p><\\\/li><li data-start=\\\"9329\\\" data-end=\\\"9372\\\"><p data-start=\\\"9332\\\" data-end=\\\"9372\\\">pH=10 ammonia-ammonium chloride buffer<\\\/p><\\\/li><li data-start=\\\"9373\\\" data-end=\\\"9394\\\"><p data-start=\\\"9376\\\" data-end=\\\"9394\\\">0.1% PAN indicator<\\\/p><\\\/li><\\\/ol><p data-start=\\\"9396\\\" data-end=\\\"9407\\\"><strong data-start=\\\"9396\\\" data-end=\\\"9405\\\">Steps<\\\/strong><\\\/p><ol data-start=\\\"9408\\\" data-end=\\\"9579\\\"><li data-start=\\\"9408\\\" data-end=\\\"9457\\\"><p data-start=\\\"9411\\\" data-end=\\\"9457\\\">Take 1 mL tank solution into a 250 mL flask.<\\\/p><\\\/li><li data-start=\\\"9458\\\" data-end=\\\"9518\\\"><p data-start=\\\"9461\\\" data-end=\\\"9518\\\">Add 100 mL pure water, 20 mL pH=10 buffer, 5 drops PAN.<\\\/p><\\\/li><li data-start=\\\"9519\\\" data-end=\\\"9579\\\"><p data-start=\\\"9522\\\" data-end=\\\"9579\\\">Titrate with EDTA-2Na until grass green. Record volume V.<\\\/p><\\\/li><\\\/ol><p data-start=\\\"9581\\\" data-end=\\\"9624\\\"><strong data-start=\\\"9581\\\" data-end=\\\"9596\\\">Calculation<\\\/strong><br data-start=\\\"9596\\\" data-end=\\\"9599\\\" \\\/>Cu\\u00b2\\u207a (g\\\/L) = 63.5 \\u00d7 c \\u00d7 V<\\\/p><p data-start=\\\"9626\\\" data-end=\\\"9658\\\"><strong data-start=\\\"9626\\\" data-end=\\\"9643\\\">Control range<\\\/strong>: Cu\\u00b2\\u207a &lt; 30 g\\\/L<\\\/p><hr data-start=\\\"9660\\\" data-end=\\\"9663\\\" \\\/><h3 data-start=\\\"9665\\\" data-end=\\\"9709\\\">4. H\\u2082SO\\u2084 in cleaning \\\/ through-hole agent<\\\/h3><p data-start=\\\"9710\\\" data-end=\\\"9767\\\">Same as micro-etch H\\u2082SO\\u2084 test. Control range: 40\\u201350 mL\\\/L.<\\\/p><hr data-start=\\\"9769\\\" data-end=\\\"9772\\\" \\\/><h3 data-start=\\\"9774\\\" data-end=\\\"9802\\\">5. Acid eq. in activation<\\\/h3><p data-start=\\\"9803\\\" data-end=\\\"10056\\\"><strong data-start=\\\"9803\\\" data-end=\\\"9815\\\">Reagents<\\\/strong>: NaOH standard 0.1 mol\\\/L, 0.1% bromophenol green indicator<br data-start=\\\"9874\\\" data-end=\\\"9877\\\" \\\/><strong data-start=\\\"9877\\\" data-end=\\\"9887\\\">Method<\\\/strong>: Take 5 mL sample, add 150 mL pure water and indicator, titrate with NaOH 0.1 mol\\\/L to blue end point.<br data-start=\\\"9990\\\" data-end=\\\"9993\\\" \\\/><strong data-start=\\\"9993\\\" data-end=\\\"10008\\\">Calculation<\\\/strong>: Acid eq. = 0.02 \\u00d7 V. Control range: 0.1\\u20130.2 N.<\\\/p><hr data-start=\\\"10058\\\" data-end=\\\"10061\\\" \\\/><h2 data-start=\\\"10063\\\" data-end=\\\"10093\\\">Immersion Tin Bath Analysis<\\\/h2><h3 data-start=\\\"10095\\\" data-end=\\\"10126\\\">1. Acid equivalent analysis<\\\/h3><p data-start=\\\"10127\\\" data-end=\\\"10352\\\"><strong data-start=\\\"10127\\\" data-end=\\\"10139\\\">Reagents<\\\/strong>: NaOH 1 mol\\\/L, 0.1% phenolphthalein indicator<br data-start=\\\"10185\\\" data-end=\\\"10188\\\" \\\/><strong data-start=\\\"10188\\\" data-end=\\\"10198\\\">Method<\\\/strong>: Take 2 mL sample, add 100 mL pure water and indicator, titrate with NaOH until colorless turns red. Record V.<br data-start=\\\"10309\\\" data-end=\\\"10312\\\" \\\/><strong data-start=\\\"10312\\\" data-end=\\\"10327\\\">Calculation<\\\/strong>: Acid eq. = 0.5 \\u00d7 c \\u00d7 V.<\\\/p><h3 data-start=\\\"10354\\\" data-end=\\\"10381\\\">2. Tin content analysis<\\\/h3><p data-start=\\\"10382\\\" data-end=\\\"10751\\\"><strong data-start=\\\"10382\\\" data-end=\\\"10394\\\">Reagents<\\\/strong>: EDTA-2Na 0.05 mol\\\/L, dimethylphenol orange indicator (mix 100 mg dimethylphenol orange with 10 g KNO\\u2083), pH 4.5 acetate buffer.<br data-start=\\\"10522\\\" data-end=\\\"10525\\\" \\\/><strong data-start=\\\"10525\\\" data-end=\\\"10535\\\">Method<\\\/strong>: Take 5 mL sample, add 25 mL pH 4.5 buffer and 100 mL pure water. Mix and add about 50 mg indicator. Titrate with EDTA-2Na until color changes from pink to yellow. Record V.<br data-start=\\\"10709\\\" data-end=\\\"10712\\\" \\\/><strong data-start=\\\"10712\\\" data-end=\\\"10727\\\">Calculation<\\\/strong>: Sn (g\\\/L) = 24 \\u00d7 c \\u00d7 V.<\\\/p><h3 data-start=\\\"10753\\\" data-end=\\\"10786\\\">3. Cu\\u00b2\\u207a in immersion tin bath<\\\/h3><p data-start=\\\"10787\\\" data-end=\\\"10866\\\">Same EDTA method as above. Control Cu\\u00b2\\u207a: use formula Cu\\u00b2\\u207a (g\\\/L) = 63.5 \\u00d7 c \\u00d7 V.<\\\/p><hr data-start=\\\"10868\\\" data-end=\\\"10871\\\" \\\/><h2 data-start=\\\"10873\\\" data-end=\\\"10890\\\">Quality Control<\\\/h2><h2 data-start=\\\"10892\\\" data-end=\\\"10930\\\">Tin thickness by gravimetric method<\\\/h2><ol data-start=\\\"10931\\\" data-end=\\\"11318\\\"><li data-start=\\\"10931\\\" data-end=\\\"11058\\\"><p data-start=\\\"10934\\\" data-end=\\\"11058\\\">Take a 5 \\u00d7 5 cm\\u00b2 double-sided copper-clad board without holes. Bake at 120\\u2103 for 15 min. Cool 15 min. Weigh precisely = W1.<\\\/p><\\\/li><li data-start=\\\"11059\\\" data-end=\\\"11140\\\"><p data-start=\\\"11062\\\" data-end=\\\"11140\\\">After degrease and micro-etch, bake at 120\\u2103 15 min. Cool 15 min. Weigh = W2.<\\\/p><\\\/li><li data-start=\\\"11141\\\" data-end=\\\"11212\\\"><p data-start=\\\"11144\\\" data-end=\\\"11212\\\">After immersion tin, bake at 120\\u2103 15 min. Cool 15 min. Weigh = W3.<\\\/p><\\\/li><li data-start=\\\"11213\\\" data-end=\\\"11264\\\"><p data-start=\\\"11216\\\" data-end=\\\"11264\\\">Micro-etch thickness (\\u00b5m) = 22.42 \\u00d7 (W1 \\u2013 W2).<\\\/p><\\\/li><li data-start=\\\"11265\\\" data-end=\\\"11318\\\"><p data-start=\\\"11268\\\" data-end=\\\"11318\\\">Immersion tin thickness (\\u00b5m) = 386.13 \\u00d7 (W3 \\u2013 W2).<\\\/p><\\\/li><\\\/ol><p data-start=\\\"11320\\\" data-end=\\\"11473\\\">Where W1 = weight before micro-etch (g)<br data-start=\\\"11359\\\" data-end=\\\"11362\\\" \\\/>W2 = weight after micro-etch (g)<br data-start=\\\"11394\\\" data-end=\\\"11397\\\" \\\/>W3 = weight after tin plating (g)<br data-start=\\\"11430\\\" data-end=\\\"11433\\\" \\\/>22.42 and 386.13 are conversion factors.<\\\/p><hr data-start=\\\"11475\\\" data-end=\\\"11478\\\" \\\/><h2 data-start=\\\"11480\\\" data-end=\\\"11495\\\">Special Notes<\\\/h2><ol data-start=\\\"11497\\\" data-end=\\\"11813\\\"><li data-start=\\\"11497\\\" data-end=\\\"11625\\\"><p data-start=\\\"11500\\\" data-end=\\\"11625\\\">Use weight method or X-ray to measure tin thickness. Keep thickness at 0.8\\u20131.2 \\u00b5m to ensure solderability and storage life.<\\\/p><\\\/li><li data-start=\\\"11626\\\" data-end=\\\"11813\\\"><p data-start=\\\"11629\\\" data-end=\\\"11813\\\">Before solder mask printing, roughen the copper surface with a coarse process and use high quality ink for solder mask. This ensures the solder mask can resist immersion tin chemicals.<\\\/p><\\\/li><\\\/ol><hr data-start=\\\"11815\\\" data-end=\\\"11818\\\" \\\/><h1 data-start=\\\"11820\\\" data-end=\\\"11850\\\">Troubleshooting and Remedies<\\\/h1><ul data-start=\\\"11852\\\" data-end=\\\"13640\\\"><li data-start=\\\"11852\\\" data-end=\\\"12326\\\"><p data-start=\\\"11854\\\" data-end=\\\"11890\\\"><strong data-start=\\\"11854\\\" data-end=\\\"11888\\\">Problem: Tin thickness too low<\\\/strong><\\\/p><ul data-start=\\\"11893\\\" data-end=\\\"12326\\\"><li data-start=\\\"11893\\\" data-end=\\\"12035\\\"><p data-start=\\\"11895\\\" data-end=\\\"11940\\\">Possible cause 1: Tank temperature too low.<\\\/p><ul data-start=\\\"11945\\\" data-end=\\\"12035\\\"><li data-start=\\\"11945\\\" data-end=\\\"12035\\\"><p data-start=\\\"11947\\\" data-end=\\\"12035\\\">Remedy: Check heater. Make sure temperature is in process range before plating boards.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12038\\\" data-end=\\\"12132\\\"><p data-start=\\\"12040\\\" data-end=\\\"12082\\\">Possible cause 2: Tank acidity too high.<\\\/p><ul data-start=\\\"12087\\\" data-end=\\\"12132\\\"><li data-start=\\\"12087\\\" data-end=\\\"12132\\\"><p data-start=\\\"12089\\\" data-end=\\\"12132\\\">Remedy: Add pure water to adjust acidity.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12135\\\" data-end=\\\"12223\\\"><p data-start=\\\"12137\\\" data-end=\\\"12173\\\">Possible cause 3: Tin content low.<\\\/p><ul data-start=\\\"12178\\\" data-end=\\\"12223\\\"><li data-start=\\\"12178\\\" data-end=\\\"12223\\\"><p data-start=\\\"12180\\\" data-end=\\\"12223\\\">Remedy: Add GZ-2069-B to raise tin level.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12226\\\" data-end=\\\"12326\\\"><p data-start=\\\"12228\\\" data-end=\\\"12268\\\">Possible cause 4: Micro-etch rate low.<\\\/p><ul data-start=\\\"12273\\\" data-end=\\\"12326\\\"><li data-start=\\\"12273\\\" data-end=\\\"12326\\\"><p data-start=\\\"12275\\\" data-end=\\\"12326\\\">Remedy: Raise micro-etch rate within process range.<\\\/p><\\\/li><\\\/ul><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12328\\\" data-end=\\\"12834\\\"><p data-start=\\\"12330\\\" data-end=\\\"12364\\\"><strong data-start=\\\"12330\\\" data-end=\\\"12362\\\">Problem: Tin surface darkens<\\\/strong><\\\/p><ul data-start=\\\"12367\\\" data-end=\\\"12834\\\"><li data-start=\\\"12367\\\" data-end=\\\"12492\\\"><p data-start=\\\"12369\\\" data-end=\\\"12410\\\">Possible cause 1: Poor tank filtration.<\\\/p><ul data-start=\\\"12415\\\" data-end=\\\"12492\\\"><li data-start=\\\"12415\\\" data-end=\\\"12492\\\"><p data-start=\\\"12417\\\" data-end=\\\"12492\\\">Remedy: Check filter system. Replace filter. Filter at 40\\u2103 for 2\\u20134 hours.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12495\\\" data-end=\\\"12589\\\"><p data-start=\\\"12497\\\" data-end=\\\"12539\\\">Possible cause 2: Tank acidity too high.<\\\/p><ul data-start=\\\"12544\\\" data-end=\\\"12589\\\"><li data-start=\\\"12544\\\" data-end=\\\"12589\\\"><p data-start=\\\"12546\\\" data-end=\\\"12589\\\">Remedy: Add pure water to adjust acidity.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12592\\\" data-end=\\\"12722\\\"><p data-start=\\\"12594\\\" data-end=\\\"12639\\\">Possible cause 3: Micro-etch speed too low.<\\\/p><ul data-start=\\\"12644\\\" data-end=\\\"12722\\\"><li data-start=\\\"12644\\\" data-end=\\\"12722\\\"><p data-start=\\\"12646\\\" data-end=\\\"12722\\\">Remedy: Check H\\u2082SO\\u2084, Na\\u2082S\\u2082O\\u2088, Cu\\u00b2\\u207a levels in micro-etch. Keep them normal.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12725\\\" data-end=\\\"12834\\\"><p data-start=\\\"12727\\\" data-end=\\\"12781\\\">Possible cause 4: Rinse not clean after tin plating.<\\\/p><ul data-start=\\\"12786\\\" data-end=\\\"12834\\\"><li data-start=\\\"12786\\\" data-end=\\\"12834\\\"><p data-start=\\\"12788\\\" data-end=\\\"12834\\\">Remedy: Improve rinsing or replace rinse tank.<\\\/p><\\\/li><\\\/ul><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12836\\\" data-end=\\\"13291\\\"><p data-start=\\\"12838\\\" data-end=\\\"12869\\\"><strong data-start=\\\"12838\\\" data-end=\\\"12867\\\">Problem: Uneven tin color<\\\/strong><\\\/p><ul data-start=\\\"12872\\\" data-end=\\\"13291\\\"><li data-start=\\\"12872\\\" data-end=\\\"12970\\\"><p data-start=\\\"12874\\\" data-end=\\\"12925\\\">Possible cause 1: Tank specific gravity too high.<\\\/p><ul data-start=\\\"12930\\\" data-end=\\\"12970\\\"><li data-start=\\\"12930\\\" data-end=\\\"12970\\\"><p data-start=\\\"12932\\\" data-end=\\\"12970\\\">Remedy: Dilute solution and analyze.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"12973\\\" data-end=\\\"13075\\\"><p data-start=\\\"12975\\\" data-end=\\\"13020\\\">Possible cause 2: Micro-etch speed too low.<\\\/p><ul data-start=\\\"13025\\\" data-end=\\\"13075\\\"><li data-start=\\\"13025\\\" data-end=\\\"13075\\\"><p data-start=\\\"13027\\\" data-end=\\\"13075\\\">Remedy: Check micro-etch H\\u2082SO\\u2084, Na\\u2082S\\u2082O\\u2088, Cu\\u00b2\\u207a.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"13078\\\" data-end=\\\"13206\\\"><p data-start=\\\"13080\\\" data-end=\\\"13149\\\">Possible cause 3: Contamination in pre-plate or immersion tin bath.<\\\/p><ul data-start=\\\"13154\\\" data-end=\\\"13206\\\"><li data-start=\\\"13154\\\" data-end=\\\"13206\\\"><p data-start=\\\"13156\\\" data-end=\\\"13206\\\">Remedy: Replace pre-plate or immersion tin bath.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"13209\\\" data-end=\\\"13291\\\"><p data-start=\\\"13211\\\" data-end=\\\"13255\\\">Possible cause 4: Copper surface abnormal.<\\\/p><ul data-start=\\\"13260\\\" data-end=\\\"13291\\\"><li data-start=\\\"13260\\\" data-end=\\\"13291\\\"><p data-start=\\\"13262\\\" data-end=\\\"13291\\\">Remedy: Clean copper surface.<\\\/p><\\\/li><\\\/ul><\\\/li><\\\/ul><\\\/li><li data-start=\\\"13293\\\" data-end=\\\"13640\\\"><p data-start=\\\"13295\\\" data-end=\\\"13328\\\"><strong data-start=\\\"13295\\\" data-end=\\\"13326\\\">Problem: Poor solderability<\\\/strong><\\\/p><ul data-start=\\\"13331\\\" data-end=\\\"13640\\\"><li data-start=\\\"13331\\\" data-end=\\\"13422\\\"><p data-start=\\\"13333\\\" data-end=\\\"13379\\\">Possible cause 1: Cu\\u00b2\\u207a in tin tank too high.<\\\/p><ul data-start=\\\"13384\\\" data-end=\\\"13422\\\"><li data-start=\\\"13384\\\" data-end=\\\"13422\\\"><p data-start=\\\"13386\\\" data-end=\\\"13422\\\">Remedy: Replace tin bath solution.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"13425\\\" data-end=\\\"13536\\\"><p data-start=\\\"13427\\\" data-end=\\\"13481\\\">Possible cause 2: Rinse not clean after tin plating.<\\\/p><ul data-start=\\\"13486\\\" data-end=\\\"13536\\\"><li data-start=\\\"13486\\\" data-end=\\\"13536\\\"><p data-start=\\\"13488\\\" data-end=\\\"13536\\\">Remedy: Improve rinsing or replace rinse tank.<\\\/p><\\\/li><\\\/ul><\\\/li><li data-start=\\\"13539\\\" data-end=\\\"13640\\\"><p data-start=\\\"13541\\\" data-end=\\\"13593\\\">Possible cause 3: Contamination during air drying.<\\\/p><ul data-start=\\\"13598\\\" data-end=\\\"13640\\\"><li data-start=\\\"13598\\\" data-end=\\\"13640\\\"><p data-start=\\\"13600\\\" data-end=\\\"13640\\\">Remedy: Clean drying section and blower.<\\\/p><\\\/li><\\\/ul><\\\/li><\\\/ul><\\\/li><\\\/ul>\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"8b4e96a\"}]},\"elements\":[],\"widgetType\":\"text-editor\"}],\"isInner\":false},{\"id\":\"epyg0ll\",\"elType\":\"section\",\"settings\":{\"gap\":\"no\",\"content_position\":\"top\",\"background_background\":\"classic\",\"background_position\":\"bottom center\",\"background_attachment\":\"scroll\",\"background_repeat\":\"no-repeat\",\"background_size\":\"cover\",\"background_size_mobile\":\"cover\",\"background_overlay_background\":\"classic\",\"background_overlay_color_b\":\"rgba(255,255,255,0)\",\"background_overlay_opacity\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]},\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"120\",\"left\":\"0\",\"isLinked\":false},\"padding_tablet\":{\"unit\":\"px\",\"top\":\"80\",\"right\":\"40\",\"bottom\":\"80\",\"left\":\"40\",\"isLinked\":false},\"padding_mobile\":{\"unit\":\"px\",\"top\":\"50\",\"right\":\"25\",\"bottom\":\"50\",\"left\":\"25\",\"isLinked\":false},\"content_width\":{\"unit\":\"px\",\"size\":800,\"sizes\":[]},\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"0184124\"}],\"margin\":{\"unit\":\"px\",\"top\":\"0\",\"right\":0,\"bottom\":\"0\",\"left\":0,\"isLinked\":true}},\"elements\":[{\"id\":\"7882748\",\"elType\":\"column\",\"settings\":{\"_column_size\":100,\"_inline_size\":null,\"padding\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"0\",\"left\":\"0\",\"isLinked\":true},\"space_between_widgets\":40,\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"c0334bb\"}]},\"elements\":[{\"id\":\"9fc6712\",\"elType\":\"widget\",\"settings\":{\"title\":\"Frequently Asked Questions\",\"align\":\"center\",\"display_condition_list\":[{\"display_condition_login_status\":\"subscriber\",\"_id\":\"fbaadc4\"}]},\"elements\":[],\"widgetType\":\"heading\"},{\"id\":\"631b990\",\"elType\":\"widget\",\"settings\":{\"tabs\":[{\"tab_title\":\"Why choose immersion tin instead of HASL or ENIG?\",\"tab_content\":\"<p>ImSn gives a flat, planar surface (better for fine-pitch and BGAs) and is usually cheaper than ENIG while offering better planarity than HASL. Choice depends on mating\\\/wear needs and long-term reliability requirements.<\\\/p>\",\"_id\":\"1f7b19c\"},{\"_id\":\"49518e3\",\"tab_title\":\"Is there a tin-whisker risk with immersion tin?\",\"tab_content\":\"<p>Pure tin finishes can, in some conditions, grow whiskers that risk shorting. Good process control, vendor mitigation (e.g., diffuse alloying or underlayers), conformal coating, or alternative finishes can manage that risk\\u2014discuss with your fabricator for high-reliability applications.<\\\/p>\"},{\"_id\":\"0f02d43\",\"tab_title\":\"How long can immersion tin boards be stored before assembly?\",\"tab_content\":\"<p>Shelf life depends on packaging and environment. Under dry, controlled storage, typical practical shelf life is limited (months rather than years); ask your supplier for recommended storage time and packing (vacuum\\\/desiccant).<\\\/p>\"},{\"_id\":\"131e0ec\",\"tab_title\":\"Can immersion tin be used for edge contacts or gold fingers?\",\"tab_content\":\"<p>No\\u2014immersion tin is not suitable for repeated mechanical mating. For edge connectors or high mating cycles use electroplated hard gold over nickel.<\\\/p>\"},{\"_id\":\"2e775a1\",\"tab_title\":\"What tests should I request for immersion tin finishes?\",\"tab_content\":\"<p>Request solderability tests, thickness\\\/XRF spot checks, visual inspection for residues\\\/tarnish, and (for critical projects) whisker and humidity\\\/migration testing.<\\\/p>\"},{\"_id\":\"e28a613\",\"tab_title\":\"Any assembly or design notes for using immersion tin?\",\"tab_content\":\"<p>Coordinate with assembler on paste\\\/flux, reflow profile, and cleaning. 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class=\\\"elementor-element elementor-element-a66c6dc e-flex e-con-boxed e-con e-parent\\\" data-id=\\\"a66c6dc\\\" data-element_type=\\\"container\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"e-con-inner\\\">\\n\\t\\t[elementor-element k=\\\"0e46bd9387093ca73b9000e38f18cce4\\\" data=\\\"{"id":"e3844ef","elType":"widget","settings":{"editor":"<h2 data-start=\"48\" data-end=\"59\">Overview<\/h2><p data-start=\"60\" data-end=\"548\">Chemical tin plating, often called immersion tin, is a surface finish used for SMT and chip packaging. It deposits a tin metal layer on copper by a chemical reaction. It works well for high-density and high-precision boards. It also suits fine traces, narrow pads, and small pitch PCBs. This finish is a green process that can replace Pb-Sn alloy plating. The deposited tin layer has fine crystal structure, a silver-white look, a flat surface, good solderability, and stable performance.<\/p><p data-start=\"60\" data-end=\"548\"><img class=\"alignnone size-full wp-image-2833\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Manual-Dip-Soldering.webp\" alt=\"Manual Dip Soldering\" width=\"353\" height=\"248\" \/><\/p><p data-start=\"550\" data-end=\"962\">The principle of chemical tin plating is to change the chemical potential of copper ions so that stannous ions in the bath undergo a displacement reaction. Reduced tin metal deposits on the copper surface to form a tin layer. Metal complexes that adsorb on the immersion tin surface help catalyze tin ion reduction. This keeps the reduction reaction going and ensures the tin layer grows to the needed thickness.<\/p><hr data-start=\"964\" data-end=\"967\" \/><h2 data-start=\"969\" data-end=\"986\">Main Functions<\/h2><ol data-start=\"988\" data-end=\"1710\"><li data-start=\"988\" data-end=\"1183\"><p data-start=\"991\" data-end=\"1183\"><strong data-start=\"991\" data-end=\"1016\">Protect copper traces<\/strong><br data-start=\"1016\" data-end=\"1019\" \/>Immersion tin forms a tin layer on copper traces. This layer protects copper from oxidation and corrosion. It helps extend the life of the printed circuit board.<\/p><\/li><li data-start=\"1185\" data-end=\"1365\"><p data-start=\"1188\" data-end=\"1365\"><strong data-start=\"1188\" data-end=\"1217\">Improve soldering quality<\/strong><br data-start=\"1217\" data-end=\"1220\" \/>The tin layer gives good soldering conditions. Solder joints become stronger and more reliable. This raises board performance and reliability.<\/p><\/li><li data-start=\"1367\" data-end=\"1570\"><p data-start=\"1370\" data-end=\"1570\"><strong data-start=\"1370\" data-end=\"1403\">Enhance electrical properties<\/strong><br data-start=\"1403\" data-end=\"1406\" \/>Tin can improve electrical performance. It can lower resistance and help with capacitance and inductance in some cases. This helps circuits run more efficiently.<\/p><\/li><li data-start=\"1572\" data-end=\"1710\"><p data-start=\"1575\" data-end=\"1710\"><strong data-start=\"1575\" data-end=\"1603\">Increase wear resistance<\/strong><br data-start=\"1603\" data-end=\"1606\" \/>Tin has decent wear resistance. It protects the board from damage caused by the external environment.<\/p><\/li><\/ol><p><img class=\"alignnone size-full wp-image-2832\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/After-Dip-Soldering-the-backside-of-the-PCB.webp\" alt=\"After Dip Soldering the backside of the PCB\" width=\"355\" height=\"321\" \/><\/p><hr data-start=\"1712\" data-end=\"1715\" \/><h2 data-start=\"1717\" data-end=\"1741\">Application Scenarios<\/h2><p data-start=\"1742\" data-end=\"2073\">Immersion tin is low cost and simple to operate. It gives clear results. It is widely used in electronics that are cost sensitive and need reasonable soldering performance. Immersion tin also works for cases that need better environmental performance. Compared with immersion gold, immersion tin is more eco-friendly in many cases.<\/p><hr data-start=\"2075\" data-end=\"2078\" \/><h2 data-start=\"2080\" data-end=\"2144\">Difference Between PCB Spray Tin and Chemical (Immersion) Tin<\/h2><ul data-start=\"2146\" data-end=\"3507\"><li data-start=\"2146\" data-end=\"2262\"><p data-start=\"2148\" data-end=\"2262\"><strong data-start=\"2148\" data-end=\"2203\">Spray tin (PCB hot air solder leveling by spraying)<\/strong> costs a bit less. This method sprays tin only onto pads.<\/p><\/li><li data-start=\"2263\" data-end=\"2572\"><p data-start=\"2265\" data-end=\"2572\"><strong data-start=\"2265\" data-end=\"2297\">Chemical tin (immersion tin)<\/strong> deposits tin by chemical means on pad areas and includes the surface copper as well. It uses a thin tin layer, usually 10\u201330 \u00b5m, mainly to prevent oxidation and to improve SMT solder wetting. Its aim is the same as immersion gold or OSP. SMT requires the board to be tinned.<\/p><\/li><li data-start=\"2574\" data-end=\"2772\"><p data-start=\"2576\" data-end=\"2772\"><strong data-start=\"2576\" data-end=\"2589\">Spray tin<\/strong> uses physical methods to spray a layer of tin. The thickness is usually 50\u2013150 \u00b5m, which is thicker. For SMT, no extra tining is needed. Soldering parts with molten solder is enough.<\/p><\/li><li data-start=\"2774\" data-end=\"3003\"><p data-start=\"2776\" data-end=\"3003\">The compositions are different. <strong data-start=\"2808\" data-end=\"2824\">Chemical tin<\/strong> uses tin salts in an acidic tin-containing solution. <strong data-start=\"2878\" data-end=\"2891\">Spray tin<\/strong> usually uses tin alloys with lead or lead-free blends (pure tin is not used because of its high melting point).<\/p><\/li><li data-start=\"3005\" data-end=\"3202\"><p data-start=\"3007\" data-end=\"3202\"><strong data-start=\"3007\" data-end=\"3023\">Chemical tin<\/strong>, also called immersion tin, is a surface treatment for pad protection like OSP, immersion gold, and immersion silver. It mainly protects the surface copper foil at the pad sites.<\/p><\/li><li data-start=\"3204\" data-end=\"3507\"><p data-start=\"3206\" data-end=\"3507\"><strong data-start=\"3206\" data-end=\"3228\">Electroplating tin<\/strong> (plated tin) is a process used in PCB factories during two-copper procedures. It protects traces and plated-through holes before etching. After etching, the protective tin is removed and production moves on to solder mask printing. Plated tin is not seen in SMT assembly plants.<\/p><\/li><\/ul><hr data-start=\"3509\" data-end=\"3512\" \/><h2 data-start=\"3514\" data-end=\"3528\">Process Flow<\/h2><div class=\"contain-inline-size rounded-2xl relative bg-token-sidebar-surface-primary\"><div class=\"sticky top-9\"><div class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\"><div class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\">\u00a0<\/div><\/div><\/div><div class=\"overflow-y-auto p-4\" dir=\"ltr\"><code class=\"whitespace-pre!\">Board in \u2192 Degrease \u2192 Rinse \u2192 Micro-etch \u2192 Rinse \u2192 Activation \u2192 Pre-dip \u2192<br \/>\u2192 Immersion Tin <span class=\"hljs-selector-tag\">A<\/span> \u2192 Immersion Tin <span class=\"hljs-selector-tag\">B<\/span> \u2192 Hot water rinse \u2192 Cold water rinse \u2192 Drain \u2192 Dry<br \/><\/code><\/div><\/div><h3 data-start=\"3700\" data-end=\"3717\">Process Notes<\/h3><ol data-start=\"3719\" data-end=\"4483\"><li data-start=\"3719\" data-end=\"3962\"><p data-start=\"3722\" data-end=\"3962\"><strong data-start=\"3722\" data-end=\"3765\">Acid clean and degrease \/ hole cleaning<\/strong><br data-start=\"3765\" data-end=\"3768\" \/>GZ-2061 and GZ-2062 remove organic dirt, fingerprints, and copper oxides from pads and through holes. They prepare a clean copper surface for immersion tin. Materials used: GZ-2061 \/ GZ-2062.<\/p><\/li><li data-start=\"3964\" data-end=\"4110\"><p data-start=\"3967\" data-end=\"4110\"><strong data-start=\"3967\" data-end=\"3981\">Activation<\/strong><br data-start=\"3981\" data-end=\"3984\" \/>GZ-2066 protects the subsequent immersion tin bath. It reduces contamination and extends bath life. Material used: GZ-2066.<\/p><\/li><li data-start=\"4112\" data-end=\"4299\"><p data-start=\"4115\" data-end=\"4299\"><strong data-start=\"4115\" data-end=\"4130\">Pre-plating<\/strong><br data-start=\"4130\" data-end=\"4133\" \/>Pre-plating applies a thin tin layer on the copper base before immersion tin. This helps get a good final appearance and a dense tin layer. Material used: GZ-2069.<\/p><\/li><li data-start=\"4301\" data-end=\"4483\"><p data-start=\"4304\" data-end=\"4483\"><strong data-start=\"4304\" data-end=\"4321\">Immersion tin<\/strong><br data-start=\"4321\" data-end=\"4324\" \/>Immersion tin can replace spray tin. It deposits tin on the copper by displacement. The solderability can last more than six months. Material used: GZ-2069.<\/p><\/li><\/ol><hr data-start=\"4485\" data-end=\"4488\" \/><h2 data-start=\"4490\" data-end=\"4516\">Product Characteristics<\/h2><p data-start=\"4517\" data-end=\"4701\">After immersion tin, boards get a good look and a uniform, dense tin layer with strong adhesion. Typical thickness is 0.8\u20131.2 \u00b5m. The tin layer shows no whiskers or dendritic crystals.<\/p><hr data-start=\"4703\" data-end=\"4706\" \/><h2 data-start=\"4708\" data-end=\"4751\">Equipment and Tank Material Requirements<\/h2><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4753\" data-end=\"5186\"><thead data-start=\"4753\" data-end=\"4820\"><tr data-start=\"4753\" data-end=\"4820\"><th data-start=\"4753\" data-end=\"4760\" data-col-size=\"sm\">Item<\/th><th data-start=\"4760\" data-end=\"4781\" data-col-size=\"sm\">Through-hole tanks<\/th><th data-start=\"4781\" data-end=\"4800\" data-col-size=\"sm\">Black-hole tanks<\/th><th data-start=\"4800\" data-end=\"4820\" data-col-size=\"md\">Micro-etch tanks<\/th><\/tr><\/thead><tbody data-start=\"4842\" data-end=\"5186\"><tr data-start=\"4842\" data-end=\"4917\"><td data-start=\"4842\" data-end=\"4854\" data-col-size=\"sm\">Tank body<\/td><td data-start=\"4854\" data-end=\"4878\" data-col-size=\"sm\">PE, PP, 304 or 316 SS<\/td><td data-start=\"4878\" data-end=\"4896\" data-col-size=\"sm\">PP, PVC, 316 SS<\/td><td data-start=\"4896\" data-end=\"4917\" data-col-size=\"md\">PE, PP, rigid PVC<\/td><\/tr><tr data-start=\"4918\" data-end=\"5000\"><td data-start=\"4918\" data-end=\"4928\" data-col-size=\"sm\">Heaters<\/td><td data-start=\"4928\" data-end=\"4961\" data-col-size=\"sm\">304 or 316 SS or Teflon-coated<\/td><td data-start=\"4961\" data-end=\"4970\" data-col-size=\"sm\">316 SS<\/td><td data-start=\"4970\" data-end=\"5000\" data-col-size=\"md\">316 SS or titanium heaters<\/td><\/tr><tr data-start=\"5001\" data-end=\"5067\"><td data-start=\"5001\" data-end=\"5014\" data-col-size=\"sm\">Filtration<\/td><td data-start=\"5014\" data-end=\"5038\" data-col-size=\"sm\">Continuous filtration<\/td><td data-start=\"5038\" data-end=\"5042\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"5042\" data-end=\"5067\" data-col-size=\"md\">Continuous filtration<\/td><\/tr><tr data-start=\"5068\" data-end=\"5186\"><td data-start=\"5068\" data-end=\"5080\" data-col-size=\"sm\">Agitation<\/td><td data-start=\"5080\" data-end=\"5110\" data-col-size=\"sm\">Mechanical swing, vibration<\/td><td data-start=\"5110\" data-end=\"5140\" data-col-size=\"sm\">Mechanical swing, vibration<\/td><td data-start=\"5140\" data-end=\"5186\" data-col-size=\"md\">Mechanical swing, vibration, air agitation<\/td><\/tr><\/tbody><\/table><\/div><\/div><hr data-start=\"5188\" data-end=\"5191\" \/><h2 data-start=\"5193\" data-end=\"5210\">Process Control<\/h2><h3 data-start=\"5212\" data-end=\"5252\">1. Bath startup (making the solution)<\/h3><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"5253\" data-end=\"5812\"><thead data-start=\"5253\" data-end=\"5332\"><tr data-start=\"5253\" data-end=\"5332\"><th data-start=\"5253\" data-end=\"5265\" data-col-size=\"sm\">Tank name<\/th><th data-start=\"5265\" data-end=\"5276\" data-col-size=\"sm\">Chemical<\/th><th data-start=\"5276\" data-end=\"5290\" data-col-size=\"sm\">Tank volume<\/th><th data-start=\"5290\" data-end=\"5314\" data-col-size=\"sm\">Startup concentration<\/th><th data-start=\"5314\" data-end=\"5332\" data-col-size=\"sm\">Startup amount<\/th><\/tr><\/thead><tbody data-start=\"5358\" data-end=\"5812\"><tr data-start=\"5358\" data-end=\"5404\"><td data-start=\"5358\" data-end=\"5369\" data-col-size=\"sm\">Degrease<\/td><td data-start=\"5369\" data-end=\"5379\" data-col-size=\"sm\">GZ-2061<\/td><td data-start=\"5379\" data-end=\"5387\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5387\" data-end=\"5397\" data-col-size=\"sm\">50 mL\/L<\/td><td data-start=\"5397\" data-end=\"5404\" data-col-size=\"sm\">5 L<\/td><\/tr><tr data-start=\"5405\" data-end=\"5444\"><td data-start=\"5405\" data-end=\"5408\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5408\" data-end=\"5418\" data-col-size=\"sm\">GZ-2062<\/td><td data-start=\"5418\" data-end=\"5426\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5426\" data-end=\"5434\" data-col-size=\"sm\">2 g\/L<\/td><td data-start=\"5434\" data-end=\"5444\" data-col-size=\"sm\">0.2 Kg<\/td><\/tr><tr data-start=\"5445\" data-end=\"5481\"><td data-start=\"5445\" data-end=\"5448\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5448\" data-end=\"5456\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"5456\" data-end=\"5464\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5464\" data-end=\"5474\" data-col-size=\"sm\">50 mL\/L<\/td><td data-start=\"5474\" data-end=\"5481\" data-col-size=\"sm\">5 L<\/td><\/tr><tr data-start=\"5482\" data-end=\"5530\"><td data-start=\"5482\" data-end=\"5495\" data-col-size=\"sm\">Micro-etch<\/td><td data-start=\"5495\" data-end=\"5503\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"5503\" data-end=\"5511\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5511\" data-end=\"5521\" data-col-size=\"sm\">25 mL\/L<\/td><td data-start=\"5521\" data-end=\"5530\" data-col-size=\"sm\">2.5 L<\/td><\/tr><tr data-start=\"5531\" data-end=\"5569\"><td data-start=\"5531\" data-end=\"5534\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5534\" data-end=\"5544\" data-col-size=\"sm\">GZ-2065<\/td><td data-start=\"5544\" data-end=\"5552\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5552\" data-end=\"5561\" data-col-size=\"sm\">20 g\/L<\/td><td data-start=\"5561\" data-end=\"5569\" data-col-size=\"sm\">2 Kg<\/td><\/tr><tr data-start=\"5570\" data-end=\"5606\"><td data-start=\"5570\" data-end=\"5573\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"5573\" data-end=\"5579\" data-col-size=\"sm\">SPS<\/td><td data-start=\"5579\" data-end=\"5587\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5587\" data-end=\"5597\" data-col-size=\"sm\">100 g\/L<\/td><td data-start=\"5597\" data-end=\"5606\" data-col-size=\"sm\">10 Kg<\/td><\/tr><tr data-start=\"5607\" data-end=\"5657\"><td data-start=\"5607\" data-end=\"5620\" data-col-size=\"sm\">Activation<\/td><td data-start=\"5620\" data-end=\"5630\" data-col-size=\"sm\">GZ-2066<\/td><td data-start=\"5630\" data-end=\"5638\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5638\" data-end=\"5649\" data-col-size=\"sm\">150 mL\/L<\/td><td data-start=\"5649\" data-end=\"5657\" data-col-size=\"sm\">15 L<\/td><\/tr><tr data-start=\"5658\" data-end=\"5706\"><td data-start=\"5658\" data-end=\"5672\" data-col-size=\"sm\">Pre-plating<\/td><td data-start=\"5672\" data-end=\"5682\" data-col-size=\"sm\">GZ-2069<\/td><td data-start=\"5682\" data-end=\"5690\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5690\" data-end=\"5697\" data-col-size=\"sm\">100%<\/td><td data-start=\"5697\" data-end=\"5706\" data-col-size=\"sm\">100 L<\/td><\/tr><tr data-start=\"5707\" data-end=\"5759\"><td data-start=\"5707\" data-end=\"5725\" data-col-size=\"sm\">Immersion Tin A<\/td><td data-start=\"5725\" data-end=\"5735\" data-col-size=\"sm\">GZ-2069<\/td><td data-start=\"5735\" data-end=\"5743\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5743\" data-end=\"5750\" data-col-size=\"sm\">100%<\/td><td data-start=\"5750\" data-end=\"5759\" data-col-size=\"sm\">100 L<\/td><\/tr><tr data-start=\"5760\" data-end=\"5812\"><td data-start=\"5760\" data-end=\"5778\" data-col-size=\"sm\">Immersion Tin B<\/td><td data-start=\"5778\" data-end=\"5788\" data-col-size=\"sm\">GZ-2069<\/td><td data-start=\"5788\" data-end=\"5796\" data-col-size=\"sm\">100 L<\/td><td data-start=\"5796\" data-end=\"5803\" data-col-size=\"sm\">100%<\/td><td data-start=\"5803\" data-end=\"5812\" data-col-size=\"sm\">100 L<\/td><\/tr><\/tbody><\/table><\/div><\/div><h3 data-start=\"5814\" data-end=\"5840\">2. Operating Conditions<\/h3><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"5841\" data-end=\"6755\"><thead data-start=\"5841\" data-end=\"5930\"><tr data-start=\"5841\" data-end=\"5930\"><th data-start=\"5841\" data-end=\"5848\" data-col-size=\"sm\">Bath<\/th><th data-start=\"5848\" data-end=\"5864\" data-col-size=\"sm\">Analysis item<\/th><th data-start=\"5864\" data-end=\"5880\" data-col-size=\"sm\">Control range<\/th><th data-start=\"5880\" data-end=\"5896\" data-col-size=\"sm\">Analysis freq<\/th><th data-start=\"5896\" data-end=\"5903\" data-col-size=\"sm\">Temp<\/th><th data-start=\"5903\" data-end=\"5916\" data-col-size=\"sm\">Time (min)<\/th><th data-start=\"5916\" data-end=\"5930\" data-col-size=\"sm\">Filtration<\/th><\/tr><\/thead><tbody data-start=\"5966\" data-end=\"6755\"><tr data-start=\"5966\" data-end=\"6031\"><td data-start=\"5966\" data-end=\"5977\" data-col-size=\"sm\">Degrease<\/td><td data-start=\"5977\" data-end=\"5985\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"5985\" data-end=\"5998\" data-col-size=\"sm\">40\u201350 mL\/L<\/td><td data-start=\"5998\" data-end=\"6009\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6009\" data-end=\"6018\" data-col-size=\"sm\">40\u201350\u2103<\/td><td data-start=\"6018\" data-end=\"6024\" data-col-size=\"sm\">3\u20135<\/td><td data-start=\"6024\" data-end=\"6031\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6032\" data-end=\"6099\"><td data-start=\"6032\" data-end=\"6045\" data-col-size=\"sm\">Micro-etch<\/td><td data-start=\"6045\" data-end=\"6053\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"6053\" data-end=\"6066\" data-col-size=\"sm\">20\u201325 mL\/L<\/td><td data-start=\"6066\" data-end=\"6077\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6077\" data-end=\"6086\" data-col-size=\"sm\">20\u201330\u2103<\/td><td data-start=\"6086\" data-end=\"6092\" data-col-size=\"sm\">1\u20132<\/td><td data-start=\"6092\" data-end=\"6099\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6100\" data-end=\"6146\"><td data-start=\"6100\" data-end=\"6103\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6103\" data-end=\"6109\" data-col-size=\"sm\">SPS<\/td><td data-start=\"6109\" data-end=\"6122\" data-col-size=\"sm\">80\u2013120 g\/L<\/td><td data-start=\"6122\" data-end=\"6133\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6133\" data-end=\"6137\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6137\" data-end=\"6141\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6141\" data-end=\"6146\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6147\" data-end=\"6207\"><td data-start=\"6147\" data-end=\"6150\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6150\" data-end=\"6168\" data-col-size=\"sm\">Micro-etch rate<\/td><td data-start=\"6168\" data-end=\"6181\" data-col-size=\"sm\">0.5\u20131.5 \u00b5m<\/td><td data-start=\"6181\" data-end=\"6194\" data-col-size=\"sm\">once\/shift<\/td><td data-start=\"6194\" data-end=\"6198\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6198\" data-end=\"6202\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6202\" data-end=\"6207\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6208\" data-end=\"6252\"><td data-start=\"6208\" data-end=\"6211\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6211\" data-end=\"6218\" data-col-size=\"sm\">Cu\u00b2\u207a<\/td><td data-start=\"6218\" data-end=\"6228\" data-col-size=\"sm\">&lt;20 g\/L<\/td><td data-start=\"6228\" data-end=\"6239\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6239\" data-end=\"6243\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6243\" data-end=\"6247\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6247\" data-end=\"6252\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6253\" data-end=\"6322\"><td data-start=\"6253\" data-end=\"6266\" data-col-size=\"sm\">Activation<\/td><td data-start=\"6266\" data-end=\"6277\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6277\" data-end=\"6289\" data-col-size=\"sm\">0.1\u20130.2 N<\/td><td data-start=\"6289\" data-end=\"6300\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6300\" data-end=\"6309\" data-col-size=\"sm\">22\u201332\u2103<\/td><td data-start=\"6309\" data-end=\"6315\" data-col-size=\"sm\">1\u20132<\/td><td data-start=\"6315\" data-end=\"6322\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6323\" data-end=\"6393\"><td data-start=\"6323\" data-end=\"6337\" data-col-size=\"sm\">Pre-plating<\/td><td data-start=\"6337\" data-end=\"6348\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6348\" data-end=\"6360\" data-col-size=\"sm\">2.0\u20134.0 N<\/td><td data-start=\"6360\" data-end=\"6371\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6371\" data-end=\"6380\" data-col-size=\"sm\">36\u201340\u2103<\/td><td data-start=\"6380\" data-end=\"6386\" data-col-size=\"sm\">1\u20132<\/td><td data-start=\"6386\" data-end=\"6393\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6394\" data-end=\"6439\"><td data-start=\"6394\" data-end=\"6397\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6397\" data-end=\"6410\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"6410\" data-end=\"6422\" data-col-size=\"sm\">12\u201316 g\/L<\/td><td data-start=\"6422\" data-end=\"6426\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6426\" data-end=\"6430\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6430\" data-end=\"6434\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6434\" data-end=\"6439\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6440\" data-end=\"6515\"><td data-start=\"6440\" data-end=\"6458\" data-col-size=\"sm\">Immersion Tin A<\/td><td data-start=\"6458\" data-end=\"6469\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6469\" data-end=\"6481\" data-col-size=\"sm\">2.0\u20134.0 N<\/td><td data-start=\"6481\" data-end=\"6492\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6492\" data-end=\"6501\" data-col-size=\"sm\">50\u201360\u2103<\/td><td data-start=\"6501\" data-end=\"6508\" data-col-size=\"sm\">5\u201310<\/td><td data-start=\"6508\" data-end=\"6515\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6516\" data-end=\"6568\"><td data-start=\"6516\" data-end=\"6519\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6519\" data-end=\"6532\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"6532\" data-end=\"6544\" data-col-size=\"sm\">12\u201316 g\/L<\/td><td data-start=\"6544\" data-end=\"6555\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6555\" data-end=\"6559\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6559\" data-end=\"6563\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6563\" data-end=\"6568\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6569\" data-end=\"6645\"><td data-start=\"6569\" data-end=\"6587\" data-col-size=\"sm\">Immersion Tin B<\/td><td data-start=\"6587\" data-end=\"6598\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"6598\" data-end=\"6610\" data-col-size=\"sm\">2.0\u20134.0 N<\/td><td data-start=\"6610\" data-end=\"6621\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6621\" data-end=\"6630\" data-col-size=\"sm\">68\u201372\u2103<\/td><td data-start=\"6630\" data-end=\"6638\" data-col-size=\"sm\">10\u201312<\/td><td data-start=\"6638\" data-end=\"6645\" data-col-size=\"sm\">Yes<\/td><\/tr><tr data-start=\"6646\" data-end=\"6698\"><td data-start=\"6646\" data-end=\"6649\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6649\" data-end=\"6662\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"6662\" data-end=\"6674\" data-col-size=\"sm\">12\u201316 g\/L<\/td><td data-start=\"6674\" data-end=\"6685\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6685\" data-end=\"6689\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6689\" data-end=\"6693\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6693\" data-end=\"6698\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"6699\" data-end=\"6755\"><td data-start=\"6699\" data-end=\"6702\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"6702\" data-end=\"6718\" data-col-size=\"sm\">Tin thickness<\/td><td data-start=\"6718\" data-end=\"6731\" data-col-size=\"sm\">0.8\u20131.2 \u00b5m<\/td><td data-start=\"6731\" data-end=\"6742\" data-col-size=\"sm\">once\/day<\/td><td data-start=\"6742\" data-end=\"6746\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6746\" data-end=\"6750\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"6750\" data-end=\"6755\" data-col-size=\"sm\">\u2014<\/td><\/tr><\/tbody><\/table><\/div><\/div><hr data-start=\"6757\" data-end=\"6760\" \/><h3 data-start=\"6762\" data-end=\"6808\">3. Bath Replenishment and Replacement Rules<\/h3><div class=\"_tableContainer_1rjym_1\"><div class=\"_tableWrapper_1rjym_13 group flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6810\" data-end=\"7466\"><thead data-start=\"6810\" data-end=\"6876\"><tr data-start=\"6810\" data-end=\"6876\"><th data-start=\"6810\" data-end=\"6817\" data-col-size=\"sm\">Bath<\/th><th data-start=\"6817\" data-end=\"6828\" data-col-size=\"sm\">Chemical<\/th><th data-start=\"6828\" data-end=\"6840\" data-col-size=\"sm\">Replenish<\/th><th data-start=\"6840\" data-end=\"6859\" data-col-size=\"sm\">Replace standard<\/th><th data-start=\"6859\" data-end=\"6876\" data-col-size=\"sm\">Filter change<\/th><\/tr><\/thead><tbody data-start=\"6901\" data-end=\"7466\"><tr data-start=\"6901\" data-end=\"7002\"><td data-start=\"6901\" data-end=\"6912\" data-col-size=\"sm\">Degrease<\/td><td data-start=\"6912\" data-end=\"6920\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"6920\" data-end=\"6938\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"6938\" data-end=\"6978\" data-col-size=\"sm\">Replace when treat 40\u201350 m\u00b2 of boards<\/td><td data-start=\"6978\" data-end=\"7002\" data-col-size=\"sm\">Change filter weekly<\/td><\/tr><tr data-start=\"7003\" data-end=\"7095\"><td data-start=\"7003\" data-end=\"7016\" data-col-size=\"sm\">Micro-etch<\/td><td data-start=\"7016\" data-end=\"7024\" data-col-size=\"sm\">H\u2082SO\u2084<\/td><td data-start=\"7024\" data-end=\"7042\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7042\" data-end=\"7071\" data-col-size=\"sm\">Replace when Cu\u00b2\u207a &gt; 20 g\/L<\/td><td data-start=\"7071\" data-end=\"7095\" data-col-size=\"sm\">Change filter weekly<\/td><\/tr><tr data-start=\"7096\" data-end=\"7132\"><td data-start=\"7096\" data-end=\"7099\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"7099\" data-end=\"7105\" data-col-size=\"sm\">SPS<\/td><td data-start=\"7105\" data-end=\"7123\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7123\" data-end=\"7127\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7127\" data-end=\"7132\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"7133\" data-end=\"7203\"><td data-start=\"7133\" data-end=\"7146\" data-col-size=\"sm\">Activation<\/td><td data-start=\"7146\" data-end=\"7157\" data-col-size=\"sm\">Acid eq.<\/td><td data-start=\"7157\" data-end=\"7175\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7175\" data-end=\"7179\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7179\" data-end=\"7203\" data-col-size=\"sm\">Change filter weekly<\/td><\/tr><tr data-start=\"7204\" data-end=\"7298\"><td data-start=\"7204\" data-end=\"7218\" data-col-size=\"sm\">Pre-plating<\/td><td data-start=\"7218\" data-end=\"7222\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7222\" data-end=\"7240\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7240\" data-end=\"7268\" data-col-size=\"sm\">Replace when Cu\u00b2\u207a &gt; 8 g\/L<\/td><td data-start=\"7268\" data-end=\"7298\" data-col-size=\"sm\">Change filter every 2 days<\/td><\/tr><tr data-start=\"7299\" data-end=\"7328\"><td data-start=\"7299\" data-end=\"7302\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"7302\" data-end=\"7315\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"7315\" data-end=\"7319\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7319\" data-end=\"7323\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7323\" data-end=\"7328\" data-col-size=\"sm\">\u2014<\/td><\/tr><tr data-start=\"7329\" data-end=\"7436\"><td data-start=\"7329\" data-end=\"7345\" data-col-size=\"sm\">Immersion tin<\/td><td data-start=\"7345\" data-end=\"7360\" data-col-size=\"sm\">Acid content<\/td><td data-start=\"7360\" data-end=\"7378\" data-col-size=\"sm\">Add by analysis<\/td><td data-start=\"7378\" data-end=\"7406\" data-col-size=\"sm\">Replace when Cu\u00b2\u207a &gt; 8 g\/L<\/td><td data-start=\"7406\" data-end=\"7436\" data-col-size=\"sm\">Change filter every 2 days<\/td><\/tr><tr data-start=\"7437\" data-end=\"7466\"><td data-start=\"7437\" data-end=\"7440\" data-col-size=\"sm\">\u00a0<\/td><td data-start=\"7440\" data-end=\"7453\" data-col-size=\"sm\">Sn content<\/td><td data-start=\"7453\" data-end=\"7457\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7457\" data-end=\"7461\" data-col-size=\"sm\">\u2014<\/td><td data-start=\"7461\" data-end=\"7466\" data-col-size=\"sm\">\u2014<\/td><\/tr><\/tbody><\/table><\/div><\/div><hr data-start=\"7468\" data-end=\"7471\" \/><h3 data-start=\"7473\" data-end=\"7497\">4. Storage Conditions<\/h3><ul data-start=\"7498\" data-end=\"7625\"><li data-start=\"7498\" data-end=\"7594\"><p data-start=\"7500\" data-end=\"7594\">GZ-2001, GZ-2002, GZ-2004: avoid direct sunlight. Shelf life two years. Store at -5\u2103 to 40\u2103.<\/p><\/li><li data-start=\"7595\" data-end=\"7625\"><p data-start=\"7597\" data-end=\"7625\">GZ-2003: store at 3\u2103 to 30\u2103.<\/p><\/li><\/ul><hr data-start=\"7627\" data-end=\"7630\" \/><h3 data-start=\"7632\" data-end=\"7658\">5. Wastewater Treatment<\/h3><ul data-start=\"7659\" data-end=\"8103\"><li data-start=\"7659\" data-end=\"7741\"><p data-start=\"7661\" data-end=\"7741\">Clean tank waste: neutralize with acid then discharge per environmental rules.<\/p><\/li><li data-start=\"7742\" data-end=\"7817\"><p data-start=\"7744\" data-end=\"7817\">Through-hole tank waste: neutralize with acid then discharge per rules.<\/p><\/li><li data-start=\"7818\" data-end=\"7881\"><p data-start=\"7820\" data-end=\"7881\">Activation tank waste: neutralize then discharge per rules.<\/p><\/li><li data-start=\"7882\" data-end=\"7960\"><p data-start=\"7884\" data-end=\"7960\">Immersion tin tank waste: neutralize with alkali then discharge per rules.<\/p><\/li><li data-start=\"7961\" data-end=\"8103\"><p data-start=\"7963\" data-end=\"8103\">Micro-etch waste: recover copper sulfate by electro-purification and recrystallization. Then neutralize with alkali and discharge per rules.<\/p><\/li><\/ul><hr data-start=\"8105\" data-end=\"8108\" \/><h2 data-start=\"8110\" data-end=\"8136\">Reagent Analysis Methods<\/h2><h3 data-start=\"8138\" data-end=\"8168\">1. H\u2082SO\u2084 in micro-etch bath<\/h3><p data-start=\"8169\" data-end=\"8183\"><strong data-start=\"8169\" data-end=\"8181\">Reagents<\/strong><\/p><ol data-start=\"8184\" data-end=\"8261\"><li data-start=\"8184\" data-end=\"8229\"><p data-start=\"8187\" data-end=\"8229\">NaOH standard solution [c(NaOH)=1 mol\/L]<\/p><\/li><li data-start=\"8230\" data-end=\"8261\"><p data-start=\"8233\" data-end=\"8261\">0.1% methyl orange indicator<\/p><\/li><\/ol><p data-start=\"8263\" data-end=\"8274\"><strong data-start=\"8263\" data-end=\"8272\">Steps<\/strong><\/p><ol data-start=\"8275\" data-end=\"8478\"><li data-start=\"8275\" data-end=\"8335\"><p data-start=\"8278\" data-end=\"8335\">Take 5 mL of tank solution into a 250 mL conical flask.<\/p><\/li><li data-start=\"8336\" data-end=\"8390\"><p data-start=\"8339\" data-end=\"8390\">Add 50 mL pure water and 2\u20135 drops methyl orange.<\/p><\/li><li data-start=\"8391\" data-end=\"8478\"><p data-start=\"8394\" data-end=\"8478\">Titrate with NaOH (1 mol\/L) until color changes from red to yellow. Record volume V.<\/p><\/li><\/ol><p data-start=\"8480\" data-end=\"8599\"><strong data-start=\"8480\" data-end=\"8495\">Calculation<\/strong><br data-start=\"8495\" data-end=\"8498\" \/>H\u2082SO\u2084 (mL\/L) = 5.43 \u00d7 c \u00d7 V<br data-start=\"8525\" data-end=\"8528\" \/>c = actual concentration of NaOH (mol\/L)<br data-start=\"8568\" data-end=\"8571\" \/>V = volume of NaOH used (mL)<\/p><p data-start=\"8601\" data-end=\"8670\"><strong data-start=\"8601\" data-end=\"8608\">Add<\/strong><br data-start=\"8608\" data-end=\"8611\" \/>H\u2082SO\u2084 (mL) = (set value \u2013 analysis value) \u00d7 tank volume (L)<\/p><hr data-start=\"8672\" data-end=\"8675\" \/><h3 data-start=\"8677\" data-end=\"8705\">2. SPS in micro-etch bath<\/h3><p data-start=\"8706\" data-end=\"8720\"><strong data-start=\"8706\" data-end=\"8718\">Reagents<\/strong><\/p><ol data-start=\"8721\" data-end=\"8831\"><li data-start=\"8721\" data-end=\"8785\"><p data-start=\"8724\" data-end=\"8785\">Sodium thiosulfate standard solution [c(Na\u2082S\u2082O\u2083)=0.1 mol\/L]<\/p><\/li><li data-start=\"8786\" data-end=\"8810\"><p data-start=\"8789\" data-end=\"8810\">1% starch indicator<\/p><\/li><li data-start=\"8811\" data-end=\"8818\"><p data-start=\"8814\" data-end=\"8818\">KI<\/p><\/li><li data-start=\"8819\" data-end=\"8831\"><p data-start=\"8822\" data-end=\"8831\">20% H\u2082SO\u2084<\/p><\/li><\/ol><p data-start=\"8833\" data-end=\"8844\"><strong data-start=\"8833\" data-end=\"8842\">Steps<\/strong><\/p><ol data-start=\"8845\" data-end=\"9107\"><li data-start=\"8845\" data-end=\"8895\"><p data-start=\"8848\" data-end=\"8895\">Take 2 mL of tank solution in a 250 mL flask.<\/p><\/li><li data-start=\"8896\" data-end=\"8971\"><p data-start=\"8899\" data-end=\"8971\">Add 50 mL pure water, 5 mL 20% H\u2082SO\u2084, 2 g KI, keep in dark for 20 min.<\/p><\/li><li data-start=\"8972\" data-end=\"9051\"><p data-start=\"8975\" data-end=\"9051\">Titrate with Na\u2082S\u2082O\u2083 until light yellow. Add a few drops starch indicator.<\/p><\/li><li data-start=\"9052\" data-end=\"9107\"><p data-start=\"9055\" data-end=\"9107\">Continue titration until colorless. Record volume V.<\/p><\/li><\/ol><p data-start=\"9109\" data-end=\"9149\"><strong data-start=\"9109\" data-end=\"9124\">Calculation<\/strong><br data-start=\"9124\" data-end=\"9127\" \/>SPS (g\/L) = 60 \u00d7 c \u00d7 V<\/p><p data-start=\"9151\" data-end=\"9230\"><strong data-start=\"9151\" data-end=\"9158\">Add<\/strong><br data-start=\"9158\" data-end=\"9161\" \/>Total SPS (g) to add = (set value \u2013 analysis value) \u00d7 tank volume (L)<\/p><hr data-start=\"9232\" data-end=\"9235\" \/><h3 data-start=\"9237\" data-end=\"9266\">3. Cu\u00b2\u207a in micro-etch bath<\/h3><p data-start=\"9267\" data-end=\"9281\"><strong data-start=\"9267\" data-end=\"9279\">Reagents<\/strong><\/p><ol data-start=\"9282\" data-end=\"9394\"><li data-start=\"9282\" data-end=\"9328\"><p data-start=\"9285\" data-end=\"9328\">EDTA-2Na standard solution [c=0.05 mol\/L]<\/p><\/li><li data-start=\"9329\" data-end=\"9372\"><p data-start=\"9332\" data-end=\"9372\">pH=10 ammonia-ammonium chloride buffer<\/p><\/li><li data-start=\"9373\" data-end=\"9394\"><p data-start=\"9376\" data-end=\"9394\">0.1% PAN indicator<\/p><\/li><\/ol><p data-start=\"9396\" data-end=\"9407\"><strong data-start=\"9396\" data-end=\"9405\">Steps<\/strong><\/p><ol data-start=\"9408\" data-end=\"9579\"><li data-start=\"9408\" data-end=\"9457\"><p data-start=\"9411\" data-end=\"9457\">Take 1 mL tank solution into a 250 mL flask.<\/p><\/li><li data-start=\"9458\" data-end=\"9518\"><p data-start=\"9461\" data-end=\"9518\">Add 100 mL pure water, 20 mL pH=10 buffer, 5 drops PAN.<\/p><\/li><li data-start=\"9519\" data-end=\"9579\"><p data-start=\"9522\" data-end=\"9579\">Titrate with EDTA-2Na until grass green. Record volume V.<\/p><\/li><\/ol><p data-start=\"9581\" data-end=\"9624\"><strong data-start=\"9581\" data-end=\"9596\">Calculation<\/strong><br data-start=\"9596\" data-end=\"9599\" \/>Cu\u00b2\u207a (g\/L) = 63.5 \u00d7 c \u00d7 V<\/p><p data-start=\"9626\" data-end=\"9658\"><strong data-start=\"9626\" data-end=\"9643\">Control range<\/strong>: Cu\u00b2\u207a &lt; 30 g\/L<\/p><hr data-start=\"9660\" data-end=\"9663\" \/><h3 data-start=\"9665\" data-end=\"9709\">4. H\u2082SO\u2084 in cleaning \/ through-hole agent<\/h3><p data-start=\"9710\" data-end=\"9767\">Same as micro-etch H\u2082SO\u2084 test. Control range: 40\u201350 mL\/L.<\/p><hr data-start=\"9769\" data-end=\"9772\" \/><h3 data-start=\"9774\" data-end=\"9802\">5. Acid eq. in activation<\/h3><p data-start=\"9803\" data-end=\"10056\"><strong data-start=\"9803\" data-end=\"9815\">Reagents<\/strong>: NaOH standard 0.1 mol\/L, 0.1% bromophenol green indicator<br data-start=\"9874\" data-end=\"9877\" \/><strong data-start=\"9877\" data-end=\"9887\">Method<\/strong>: Take 5 mL sample, add 150 mL pure water and indicator, titrate with NaOH 0.1 mol\/L to blue end point.<br data-start=\"9990\" data-end=\"9993\" \/><strong data-start=\"9993\" data-end=\"10008\">Calculation<\/strong>: Acid eq. = 0.02 \u00d7 V. Control range: 0.1\u20130.2 N.<\/p><hr data-start=\"10058\" data-end=\"10061\" \/><h2 data-start=\"10063\" data-end=\"10093\">Immersion Tin Bath Analysis<\/h2><h3 data-start=\"10095\" data-end=\"10126\">1. Acid equivalent analysis<\/h3><p data-start=\"10127\" data-end=\"10352\"><strong data-start=\"10127\" data-end=\"10139\">Reagents<\/strong>: NaOH 1 mol\/L, 0.1% phenolphthalein indicator<br data-start=\"10185\" data-end=\"10188\" \/><strong data-start=\"10188\" data-end=\"10198\">Method<\/strong>: Take 2 mL sample, add 100 mL pure water and indicator, titrate with NaOH until colorless turns red. Record V.<br data-start=\"10309\" data-end=\"10312\" \/><strong data-start=\"10312\" data-end=\"10327\">Calculation<\/strong>: Acid eq. = 0.5 \u00d7 c \u00d7 V.<\/p><h3 data-start=\"10354\" data-end=\"10381\">2. Tin content analysis<\/h3><p data-start=\"10382\" data-end=\"10751\"><strong data-start=\"10382\" data-end=\"10394\">Reagents<\/strong>: EDTA-2Na 0.05 mol\/L, dimethylphenol orange indicator (mix 100 mg dimethylphenol orange with 10 g KNO\u2083), pH 4.5 acetate buffer.<br data-start=\"10522\" data-end=\"10525\" \/><strong data-start=\"10525\" data-end=\"10535\">Method<\/strong>: Take 5 mL sample, add 25 mL pH 4.5 buffer and 100 mL pure water. Mix and add about 50 mg indicator. Titrate with EDTA-2Na until color changes from pink to yellow. Record V.<br data-start=\"10709\" data-end=\"10712\" \/><strong data-start=\"10712\" data-end=\"10727\">Calculation<\/strong>: Sn (g\/L) = 24 \u00d7 c \u00d7 V.<\/p><h3 data-start=\"10753\" data-end=\"10786\">3. Cu\u00b2\u207a in immersion tin bath<\/h3><p data-start=\"10787\" data-end=\"10866\">Same EDTA method as above. Control Cu\u00b2\u207a: use formula Cu\u00b2\u207a (g\/L) = 63.5 \u00d7 c \u00d7 V.<\/p><hr data-start=\"10868\" data-end=\"10871\" \/><h2 data-start=\"10873\" data-end=\"10890\">Quality Control<\/h2><h2 data-start=\"10892\" data-end=\"10930\">Tin thickness by gravimetric method<\/h2><ol data-start=\"10931\" data-end=\"11318\"><li data-start=\"10931\" data-end=\"11058\"><p data-start=\"10934\" data-end=\"11058\">Take a 5 \u00d7 5 cm\u00b2 double-sided copper-clad board without holes. Bake at 120\u2103 for 15 min. Cool 15 min. Weigh precisely = W1.<\/p><\/li><li data-start=\"11059\" data-end=\"11140\"><p data-start=\"11062\" data-end=\"11140\">After degrease and micro-etch, bake at 120\u2103 15 min. Cool 15 min. Weigh = W2.<\/p><\/li><li data-start=\"11141\" data-end=\"11212\"><p data-start=\"11144\" data-end=\"11212\">After immersion tin, bake at 120\u2103 15 min. Cool 15 min. Weigh = W3.<\/p><\/li><li data-start=\"11213\" data-end=\"11264\"><p data-start=\"11216\" data-end=\"11264\">Micro-etch thickness (\u00b5m) = 22.42 \u00d7 (W1 \u2013 W2).<\/p><\/li><li data-start=\"11265\" data-end=\"11318\"><p data-start=\"11268\" data-end=\"11318\">Immersion tin thickness (\u00b5m) = 386.13 \u00d7 (W3 \u2013 W2).<\/p><\/li><\/ol><p data-start=\"11320\" data-end=\"11473\">Where W1 = weight before micro-etch (g)<br data-start=\"11359\" data-end=\"11362\" \/>W2 = weight after micro-etch (g)<br data-start=\"11394\" data-end=\"11397\" \/>W3 = weight after tin plating (g)<br data-start=\"11430\" data-end=\"11433\" \/>22.42 and 386.13 are conversion factors.<\/p><hr data-start=\"11475\" data-end=\"11478\" \/><h2 data-start=\"11480\" data-end=\"11495\">Special Notes<\/h2><ol data-start=\"11497\" data-end=\"11813\"><li data-start=\"11497\" data-end=\"11625\"><p data-start=\"11500\" data-end=\"11625\">Use weight method or X-ray to measure tin thickness. Keep thickness at 0.8\u20131.2 \u00b5m to ensure solderability and storage life.<\/p><\/li><li data-start=\"11626\" data-end=\"11813\"><p data-start=\"11629\" data-end=\"11813\">Before solder mask printing, roughen the copper surface with a coarse process and use high quality ink for solder mask. This ensures the solder mask can resist immersion tin chemicals.<\/p><\/li><\/ol><hr data-start=\"11815\" data-end=\"11818\" \/><h1 data-start=\"11820\" data-end=\"11850\">Troubleshooting and Remedies<\/h1><ul data-start=\"11852\" data-end=\"13640\"><li data-start=\"11852\" data-end=\"12326\"><p data-start=\"11854\" data-end=\"11890\"><strong data-start=\"11854\" data-end=\"11888\">Problem: Tin thickness too low<\/strong><\/p><ul data-start=\"11893\" data-end=\"12326\"><li data-start=\"11893\" data-end=\"12035\"><p data-start=\"11895\" data-end=\"11940\">Possible cause 1: Tank temperature too low.<\/p><ul data-start=\"11945\" data-end=\"12035\"><li data-start=\"11945\" data-end=\"12035\"><p data-start=\"11947\" data-end=\"12035\">Remedy: Check heater. Make sure temperature is in process range before plating boards.<\/p><\/li><\/ul><\/li><li data-start=\"12038\" data-end=\"12132\"><p data-start=\"12040\" data-end=\"12082\">Possible cause 2: Tank acidity too high.<\/p><ul data-start=\"12087\" data-end=\"12132\"><li data-start=\"12087\" data-end=\"12132\"><p data-start=\"12089\" data-end=\"12132\">Remedy: Add pure water to adjust acidity.<\/p><\/li><\/ul><\/li><li data-start=\"12135\" data-end=\"12223\"><p data-start=\"12137\" data-end=\"12173\">Possible cause 3: Tin content low.<\/p><ul data-start=\"12178\" data-end=\"12223\"><li data-start=\"12178\" data-end=\"12223\"><p data-start=\"12180\" data-end=\"12223\">Remedy: Add GZ-2069-B to raise tin level.<\/p><\/li><\/ul><\/li><li data-start=\"12226\" data-end=\"12326\"><p data-start=\"12228\" data-end=\"12268\">Possible cause 4: Micro-etch rate low.<\/p><ul data-start=\"12273\" data-end=\"12326\"><li data-start=\"12273\" data-end=\"12326\"><p data-start=\"12275\" data-end=\"12326\">Remedy: Raise micro-etch rate within process range.<\/p><\/li><\/ul><\/li><\/ul><\/li><li data-start=\"12328\" data-end=\"12834\"><p data-start=\"12330\" data-end=\"12364\"><strong data-start=\"12330\" data-end=\"12362\">Problem: Tin surface darkens<\/strong><\/p><ul data-start=\"12367\" data-end=\"12834\"><li data-start=\"12367\" data-end=\"12492\"><p data-start=\"12369\" data-end=\"12410\">Possible cause 1: Poor tank filtration.<\/p><ul data-start=\"12415\" data-end=\"12492\"><li data-start=\"12415\" data-end=\"12492\"><p data-start=\"12417\" data-end=\"12492\">Remedy: Check filter system. Replace filter. Filter at 40\u2103 for 2\u20134 hours.<\/p><\/li><\/ul><\/li><li data-start=\"12495\" data-end=\"12589\"><p data-start=\"12497\" data-end=\"12539\">Possible cause 2: Tank acidity too high.<\/p><ul data-start=\"12544\" data-end=\"12589\"><li data-start=\"12544\" data-end=\"12589\"><p data-start=\"12546\" data-end=\"12589\">Remedy: Add pure water to adjust acidity.<\/p><\/li><\/ul><\/li><li data-start=\"12592\" data-end=\"12722\"><p data-start=\"12594\" data-end=\"12639\">Possible cause 3: Micro-etch speed too low.<\/p><ul data-start=\"12644\" data-end=\"12722\"><li data-start=\"12644\" data-end=\"12722\"><p data-start=\"12646\" data-end=\"12722\">Remedy: Check H\u2082SO\u2084, Na\u2082S\u2082O\u2088, Cu\u00b2\u207a levels in micro-etch. Keep them normal.<\/p><\/li><\/ul><\/li><li data-start=\"12725\" data-end=\"12834\"><p data-start=\"12727\" data-end=\"12781\">Possible cause 4: Rinse not clean after tin plating.<\/p><ul data-start=\"12786\" data-end=\"12834\"><li data-start=\"12786\" data-end=\"12834\"><p data-start=\"12788\" data-end=\"12834\">Remedy: Improve rinsing or replace rinse tank.<\/p><\/li><\/ul><\/li><\/ul><\/li><li data-start=\"12836\" data-end=\"13291\"><p data-start=\"12838\" data-end=\"12869\"><strong data-start=\"12838\" data-end=\"12867\">Problem: Uneven tin color<\/strong><\/p><ul data-start=\"12872\" data-end=\"13291\"><li data-start=\"12872\" data-end=\"12970\"><p data-start=\"12874\" data-end=\"12925\">Possible cause 1: Tank specific gravity too high.<\/p><ul data-start=\"12930\" data-end=\"12970\"><li data-start=\"12930\" data-end=\"12970\"><p data-start=\"12932\" data-end=\"12970\">Remedy: Dilute solution and analyze.<\/p><\/li><\/ul><\/li><li data-start=\"12973\" data-end=\"13075\"><p data-start=\"12975\" data-end=\"13020\">Possible cause 2: Micro-etch speed too low.<\/p><ul data-start=\"13025\" data-end=\"13075\"><li data-start=\"13025\" data-end=\"13075\"><p data-start=\"13027\" data-end=\"13075\">Remedy: Check micro-etch H\u2082SO\u2084, Na\u2082S\u2082O\u2088, Cu\u00b2\u207a.<\/p><\/li><\/ul><\/li><li data-start=\"13078\" data-end=\"13206\"><p data-start=\"13080\" data-end=\"13149\">Possible cause 3: Contamination in pre-plate or immersion tin bath.<\/p><ul data-start=\"13154\" data-end=\"13206\"><li data-start=\"13154\" data-end=\"13206\"><p data-start=\"13156\" data-end=\"13206\">Remedy: Replace pre-plate or immersion tin bath.<\/p><\/li><\/ul><\/li><li data-start=\"13209\" data-end=\"13291\"><p data-start=\"13211\" data-end=\"13255\">Possible cause 4: Copper surface abnormal.<\/p><ul data-start=\"13260\" data-end=\"13291\"><li data-start=\"13260\" data-end=\"13291\"><p data-start=\"13262\" data-end=\"13291\">Remedy: Clean copper surface.<\/p><\/li><\/ul><\/li><\/ul><\/li><li data-start=\"13293\" data-end=\"13640\"><p data-start=\"13295\" data-end=\"13328\"><strong data-start=\"13295\" data-end=\"13326\">Problem: Poor solderability<\/strong><\/p><ul data-start=\"13331\" data-end=\"13640\"><li data-start=\"13331\" data-end=\"13422\"><p data-start=\"13333\" data-end=\"13379\">Possible cause 1: Cu\u00b2\u207a in tin tank too high.<\/p><ul data-start=\"13384\" data-end=\"13422\"><li data-start=\"13384\" data-end=\"13422\"><p data-start=\"13386\" data-end=\"13422\">Remedy: Replace tin bath solution.<\/p><\/li><\/ul><\/li><li data-start=\"13425\" data-end=\"13536\"><p data-start=\"13427\" data-end=\"13481\">Possible cause 2: Rinse not clean after tin plating.<\/p><ul data-start=\"13486\" data-end=\"13536\"><li data-start=\"13486\" data-end=\"13536\"><p data-start=\"13488\" data-end=\"13536\">Remedy: Improve rinsing or replace rinse tank.<\/p><\/li><\/ul><\/li><li data-start=\"13539\" data-end=\"13640\"><p data-start=\"13541\" data-end=\"13593\">Possible cause 3: Contamination during air drying.<\/p><ul data-start=\"13598\" data-end=\"13640\"><li data-start=\"13598\" data-end=\"13640\"><p data-start=\"13600\" data-end=\"13640\">Remedy: Clean drying section and blower.<\/p><\/li><\/ul><\/li><\/ul><\/li><\/ul>","display_condition_list":[{"display_condition_login_status":"subscriber","_id":"8b4e96a"}]},"elements":[],"widgetType":"text-editor"}\\\"]\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<section class=\\\"elementor-section elementor-top-section elementor-element elementor-element-epyg0ll elementor-section-content-top elementor-section-boxed elementor-section-height-default elementor-section-height-default\\\" data-id=\\\"epyg0ll\\\" data-element_type=\\\"section\\\" data-settings=\\\"{&quot;background_background&quot;:&quot;classic&quot;}\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-background-overlay\\\"><\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-container elementor-column-gap-no\\\">\\n\\t\\t\\t\\t\\t<div class=\\\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7882748\\\" data-id=\\\"7882748\\\" data-element_type=\\\"column\\\">\\n\\t\\t\\t<div class=\\\"elementor-widget-wrap elementor-element-populated\\\">\\n\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-9fc6712 elementor-widget elementor-widget-heading\\\" data-id=\\\"9fc6712\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"heading.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t<h2 class=\\\"elementor-heading-title elementor-size-default\\\">Frequently Asked Questions<\\\/h2>\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<div class=\\\"elementor-element elementor-element-631b990 elementor-widget elementor-widget-accordion\\\" data-id=\\\"631b990\\\" data-element_type=\\\"widget\\\" data-widget_type=\\\"accordion.default\\\">\\n\\t\\t\\t\\t<div class=\\\"elementor-widget-container\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion\\\">\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1031\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"1\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1031\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Why choose immersion tin instead of HASL or ENIG?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1031\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"1\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1031\\\"><p>ImSn gives a flat, planar surface (better for fine-pitch and BGAs) and is usually cheaper than ENIG while offering better planarity than HASL. Choice depends on mating\\\/wear needs and long-term reliability requirements.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1032\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"2\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1032\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Is there a tin-whisker risk with immersion tin?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1032\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"2\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1032\\\"><p>Pure tin finishes can, in some conditions, grow whiskers that risk shorting. Good process control, vendor mitigation (e.g., diffuse alloying or underlayers), conformal coating, or alternative finishes can manage that risk\\u2014discuss with your fabricator for high-reliability applications.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1033\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"3\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1033\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">How long can immersion tin boards be stored before assembly?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1033\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"3\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1033\\\"><p>Shelf life depends on packaging and environment. Under dry, controlled storage, typical practical shelf life is limited (months rather than years); ask your supplier for recommended storage time and packing (vacuum\\\/desiccant).<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1034\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"4\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1034\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Can immersion tin be used for edge contacts or gold fingers?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1034\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"4\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1034\\\"><p>No\\u2014immersion tin is not suitable for repeated mechanical mating. For edge connectors or high mating cycles use electroplated hard gold over nickel.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1035\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"5\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1035\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">What tests should I request for immersion tin finishes?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1035\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"5\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1035\\\"><p>Request solderability tests, thickness\\\/XRF spot checks, visual inspection for residues\\\/tarnish, and (for critical projects) whisker and humidity\\\/migration testing.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t<div class=\\\"elementor-accordion-item\\\">\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-title-1036\\\" class=\\\"elementor-tab-title\\\" data-tab=\\\"6\\\" role=\\\"button\\\" aria-controls=\\\"elementor-tab-content-1036\\\" aria-expanded=\\\"false\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon elementor-accordion-icon-right\\\" aria-hidden=\\\"true\\\">\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-closed\\\"><svg class=\\\"e-font-icon-svg e-fas-plus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm144 276c0 6.6-5.4 12-12 12h-92v92c0 6.6-5.4 12-12 12h-56c-6.6 0-12-5.4-12-12v-92h-92c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h92v-92c0-6.6 5.4-12 12-12h56c6.6 0 12 5.4 12 12v92h92c6.6 0 12 5.4 12 12v56z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t<span class=\\\"elementor-accordion-icon-opened\\\"><svg class=\\\"e-font-icon-svg e-fas-minus-circle\\\" viewBox=\\\"0 0 512 512\\\" xmlns=\\\"http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\\"><path d=\\\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zM124 296c-6.6 0-12-5.4-12-12v-56c0-6.6 5.4-12 12-12h264c6.6 0 12 5.4 12 12v56c0 6.6-5.4 12-12 12H124z\\\"><\\\/path><\\\/svg><\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<\\\/span>\\n\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\t<a class=\\\"elementor-accordion-title\\\" tabindex=\\\"0\\\">Any assembly or design notes for using immersion tin?<\\\/a>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<div id=\\\"elementor-tab-content-1036\\\" class=\\\"elementor-tab-content elementor-clearfix\\\" data-tab=\\\"6\\\" role=\\\"region\\\" aria-labelledby=\\\"elementor-tab-title-1036\\\"><p>Coordinate with assembler on paste\\\/flux, reflow profile, and cleaning. Avoid placing mechanical mating surfaces on ImSn areas; call out any via-in-pad or pad fill needs in fabrication notes.<\\\/p><\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/div>\\n\\t\\t\\t\\t\\t<\\\/div>\\n\\t\\t<\\\/section>\\n\\t\\t\",\"scripts\":[],\"styles\":[]}}"],"_uag_css_file_name":["uag-css-2417.css"],"_uag_js_file_name":["uag-js-2417.js"]},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Philifast","author_link":"https:\/\/flj-pcb.com\/szl\/author\/2475017442jygmail-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Overview Chemical tin plating, often called immersion tin, is a surface finish used for SMT and chip packaging. It deposits [&hellip;]","_links":{"self":[{"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/pages\/2417","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/comments?post=2417"}],"version-history":[{"count":14,"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/pages\/2417\/revisions"}],"predecessor-version":[{"id":3449,"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/pages\/2417\/revisions\/3449"}],"up":[{"embeddable":true,"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/pages\/1898"}],"wp:attachment":[{"href":"https:\/\/flj-pcb.com\/szl\/wp-json\/wp\/v2\/media?parent=2417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}