{"id":5781,"date":"2026-11-03T08:30:28","date_gmt":"2026-11-03T08:30:28","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=5781"},"modified":"2026-11-03T08:30:28","modified_gmt":"2026-11-03T08:30:28","slug":"polyimide-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/polyimide-pcb\/","title":{"rendered":"Polyimide PCB"},"content":{"rendered":"<div class=\"pi-page flj-page\" id=\"flj-content\"><section class=\"pi-hero\"><div class=\"container\"><nav aria-label=\"Hlebne mrvice\" class=\"pi-crumb\"><a href=\"https:\/\/flj-pcb.com\/bs\/\">Po\u010detna<\/a><span>\/<\/span><a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/\">PCB Manufacturing<\/a><span>\/<\/span><span>Polyimide PCB<\/span><\/nav><div class=\"pi-hero-grid\"><div><p class=\"pi-kicker\">POLYIMIDE \u00b7 FROM MATERIAL TO CIRCUIT<\/p><h1>Polyimide PCB<br\/>Materials &amp;<br\/>Proizvodnja<\/h1><p class=\"pi-lead\">Heat-resistant insulation. Flexible films. Rigid multilayer possibilities.<\/p><p>FLJ manufactures polyimide-based flexible, rigid-flex and rigid circuit boards. Match the material form to your thermal conditions and mechanical design, then turn that construction into prototype or production boards, with assembly available.<\/p><a class=\"btn\" href=\"https:\/\/flj-pcb.com\/bs\/contact\/\">Get a Polyimide PCB Quote<\/a><\/div><div class=\"pi-hero-image\"><figure><img fetchpriority=\"high\" width=\"600\" height=\"369\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/flex-pcba.webp\" class=\"attachment-full size-full\" alt=\"Assembled flexible circuit curved below a connector and surface-mounted components\" decoding=\"async\" loading=\"eager\" sizes=\"(max-width: 800px) calc(100vw - 40px), 600px\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/flex-pcba.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/flex-pcba-300x185.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/05\/flex-pcba-18x12.webp 18w\" \/><figcaption>Flexible circuit construction \u00b7 assembled board reference<\/figcaption><\/figure><div class=\"pi-hero-label\"><span>ONE MATERIAL FAMILY<\/span><strong>Different ways<br\/>to build a circuit.<\/strong><a href=\"#pi-materials\">Explore material forms \u2193<\/a><\/div><\/div><\/div><\/div><\/section>\n<section class=\"pi-section pi-definition\"><div class=\"container pi-definition-grid\"><div><p class=\"pi-kicker\">UNDERSTANDING THE BASE MATERIAL<\/p><h2>What is polyimide<br\/>PCB material?<\/h2><p>Polyimide, or PI, is a family of polymers used as an insulating material in printed circuits. In a flexible circuit, a thin PI film supports the copper conductors. In a rigid polyimide board, a reinforced resin system forms the solid laminate. The same material-family name therefore covers very different board constructions.<\/p><p>A complete circuit also includes copper and may include bonding adhesives, protective coverlay and local stiffeners. These layers work together: the properties of a bare PI film do not describe the whole finished board.<\/p><\/div><figure><img loading=\"lazy\" width=\"700\" height=\"331\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/polyimide-film.webp\" class=\"attachment-full size-full\" alt=\"Three views of amber polyimide film on a white roll\" decoding=\"async\" sizes=\"auto, (max-width: 800px) calc(100vw - 40px), 600px\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/polyimide-film.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/polyimide-film-300x142.webp 300w\" \/><figcaption>PI film reference \u00b7 film, copper and bonding layers have distinct roles.<\/figcaption><\/figure><\/div><\/section>\n<section class=\"pi-section pi-properties\"><div class=\"container\"><div class=\"pi-section-head\"><p class=\"pi-kicker\">PROPERTIES WITH A PRACTICAL PURPOSE<\/p><h2>Why choose polyimide?<\/h2><\/div><div class=\"pi-properties-grid\"><article><span class=\"pi-property-tag\">HEAT<\/span><h3>Thermal endurance where the circuit needs it<\/h3><p>Repeated soldering exposure and elevated service temperatures place different demands on an insulating material. PI offers options for both: films that remain useful through flex-circuit assembly and reinforced resin systems developed for thermally demanding multilayers. In the latter, resin expansion and stability also matter to the plated connections running through the board.<\/p><p>The useful comparison is between a grade\u2019s thermal properties and the expected exposure. Tg describes a material transition; long-term temperature performance has its own ratings. A heat-resistant substrate also needs a separate heat-spreading strategy\u2014copper, thermal paths and the enclosure still carry heat away from components.<\/p><\/article><article><span class=\"pi-property-tag\">MECHANICS<\/span><h3>Thin insulation that follows the mechanical design<\/h3><p>PI film places electrical insulation in a thin, lightweight structure. Combined with patterned copper, it makes a circuit that can fit around a housing or connect sections at different orientations. That is useful when a rigid board and a separate cable occupy too much space.<\/p><p>The bending behavior belongs to the full stack: copper type and thickness, film, adhesive, coverlay and bend geometry all contribute. A glass-reinforced PI laminate has a different role, giving a rigid circuit its dimensional support.<\/p><\/article><article><span class=\"pi-property-tag\">ELECTRICAL<\/span><h3>Insulation and the signal path<\/h3><p>A thin PI dielectric separates conductors without adding the bulk of a rigid substrate. That makes it useful in closely packed flex connections. For controlled-impedance routing, its thickness and dielectric constant work together with trace width and reference-plane spacing to set the transmission-line geometry.<\/p><p>Dielectric loss is a separate selection factor. Material data at the relevant frequency helps distinguish a suitable signal-carrying construction from one chosen primarily for thermal endurance; \u201cpolyimide\u201d alone is not a low-loss specification.<\/p><\/article><article><span class=\"pi-property-tag\">ENVIRONMENT<\/span><h3>Material behavior in the working environment<\/h3><p>The environment reaches more than the base film: coverlay, bonding layers and exposed contacts are also part of a flexible circuit. Chemical compatibility is therefore selected for those materials and the expected exposure together. Moisture absorption matters during storage and before heat processing, so material-specific conditioning and drying are part of preparing a PI board for assembly. The resin-family name gives a starting point; the complete construction determines the usable combination.<\/p><\/article><\/div><\/div><\/section>\n<section class=\"pi-section pi-forms\" id=\"pi-materials\"><div class=\"container\"><div class=\"pi-section-head\"><p class=\"pi-kicker\">FILM \u00b7 COPPER-CLAD BASE \u00b7 REINFORCED LAMINATE<\/p><h2>Choose the material form first<\/h2><\/div><div class=\"pi-flex-forms\"><div><h3>PI film and flexible<br\/>copper-clad laminates<\/h3><p>An adhesive-based flexible laminate bonds copper to PI film with a separate adhesive layer. An adhesiveless base joins copper and PI without that separate layer, changing the dielectric thickness and the interfaces in the construction. Coverlay may still use adhesive even when the copper-clad base is adhesiveless.<\/p><p>Removing the separate base adhesive can reduce the dielectric buildup and remove one interface from the copper-to-film construction. The useful choice depends on the required thickness, thermal exposure and flexing behavior, alongside the copper and coverlay. This is a construction choice, not a count of the finished board\u2019s copper layers.<\/p><\/div><figure class=\"pi-stack\"><figcaption>Two flexible copper-clad constructions<\/figcaption><div class=\"pi-stack-pair\"><div><h4>Adhesive-based<\/h4><span class=\"pi-layer copper\">Bakar<\/span><span class=\"pi-layer adhesive\">Separate adhesive<\/span><span class=\"pi-layer film\">PI film<\/span><\/div><div><h4>Adhesiveless base<\/h4><span class=\"pi-layer copper\">Bakar<\/span><span class=\"pi-layer film\">PI film<\/span><\/div><\/div><p>Conceptual base construction, not to scale. Coverlay and other finished-circuit layers are not shown.<\/p><\/figure><\/div><div class=\"pi-rigid-form\"><div><span class=\"pi-property-tag\">A RIGID-BOARD MATERIAL EXAMPLE<\/span><h3>Reinforced PI cores<br\/>and prepregs<\/h3><p>Rigid PI multilayers use copper-clad cores and matching bonding materials. The core supplies a cured dielectric and copper for the inner circuits; prepreg flows and cures during lamination to join the patterned layers.<\/p><\/div><div><p>A named rigid-board example is Isola P95 laminate with P25 prepreg: an E-glass-reinforced polyimide\/thermoplastic blend. Its product data illustrates why separate material ratings matter.<\/p><div aria-label=\"P95 and P25 material data\" class=\"pi-table\" role=\"region\" tabindex=\"0\"><table><thead><tr><th scope=\"col\">P95 \/ P25 property<\/th><th scope=\"col\">Listed value<\/th><th scope=\"col\">What it describes<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Glass transition, DSC<\/th><td>260\u00b0C<\/td><td>A material transition, not a board operating limit<\/td><\/tr><tr><th scope=\"row\">Relative thermal index, UL 746<\/th><td>170\u00b0C<\/td><td>Long-term thermal endurance rating<\/td><\/tr><tr><th scope=\"row\">Flammability<\/th><td>UL 94 HB<\/td><td>The classification of this material system<\/td><\/tr><\/tbody><\/table><\/div><p>These values describe the named material. A different PI formulation can have different thermal, electrical and flame properties.<\/p><p><a href=\"https:\/\/www.isola-group.com\/pcb-laminates-prepreg\/p95-p25-polyimide-ul-hb\/\" target=\"_blank\" rel=\"noopener\">Isola P95 \/ P25 material information<\/a> provides the underlying product data.<\/p><\/div><\/div><\/div><\/section>\n<section class=\"pi-section pi-compare\"><div class=\"container\"><div class=\"pi-section-head\"><p class=\"pi-kicker\">SELECT THE CONSTRUCTION FOR THE JOB<\/p><h2>Polyimide vs FR-4<\/h2><\/div><div aria-label=\"Polyimide and FR4 selection comparison\" class=\"pi-table\" role=\"region\" tabindex=\"0\"><table><thead><tr><th scope=\"col\">Selection question<\/th><th scope=\"col\">Polyimide option<\/th><th scope=\"col\">FR-4 option<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Mechanical form<\/th><td>PI film serves flexible connections; glass-reinforced PI serves rigid boards.<\/td><td>Standard glass-reinforced FR-4 serves rigid boards.<\/td><\/tr><tr><th scope=\"row\">Thermal duty in a rigid board<\/th><td>Reinforced PI grades offer thermal endurance options for demanding builds.<\/td><td>Standard and high-Tg grades cover many assembly and service conditions.<\/td><\/tr><tr><th scope=\"row\">What does the signal need?<\/th><td>Use grade-specific Dk and Df with their test conditions.<\/td><td>FR-4 also varies by grade; compare the actual loss and geometry needs.<\/td><\/tr><tr><th scope=\"row\">What controls the finished cost?<\/th><td>Material system, construction and processing route all contribute.<\/td><td>Established rigid-board materials are often the economical starting point.<\/td><\/tr><\/tbody><\/table><\/div><p>For a rigid board, compare reinforced PI against the relevant <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/fr4-pcb\/\">FR-4 grade<\/a>, rather than comparing bare PI film with a complete fiberglass laminate. Where heat exposure is the main concern, <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/high-tg-pcb\/\">high-Tg PCB materials<\/a> are also worth evaluating before changing the resin family.<\/p><\/div><\/section>\n<section class=\"pi-section pi-applications\"><div class=\"container\"><div class=\"pi-section-head\"><p class=\"pi-kicker\">MATERIAL CHOICES IN FINISHED HARDWARE<\/p><h2>Polyimide in finished circuits<\/h2><\/div><div class=\"pi-app-grid\"><article><figure><img loading=\"lazy\" width=\"400\" height=\"400\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Application-of-Flexible-PCB-in-Mobile-Phones.webp\" class=\"attachment-full size-full\" alt=\"Compact device flex connection with a connector, copper contact regions and mounting support\" decoding=\"async\" sizes=\"auto, (max-width: 800px) calc(100vw - 40px), 600px\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Application-of-Flexible-PCB-in-Mobile-Phones.webp 400w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Application-of-Flexible-PCB-in-Mobile-Phones-300x300.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/08\/Application-of-Flexible-PCB-in-Mobile-Phones-150x150.webp 150w\" \/><figcaption>Compact-device interconnect reference<\/figcaption><\/figure><h3>Flexible connections<br\/>and rigid-flex assemblies<\/h3><p>A flexible circuit carries copper conductors through a thin insulated span. This can connect a compact device&#8217;s control board to a display, sensor or connector while fitting the available enclosure space. Local support can keep a component or contact region firm while the interconnecting section bends.<\/p><p>When rigid component-bearing sections and flexible interconnects belong in one board, <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/flex-rigid-pcb\/\">rigid-flex construction<\/a> integrates those regions. For separate flexible circuits, <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-manufacturer\/flexible-pcb\/\">flex PCB manufacturing<\/a> covers the contact, coverlay and stiffener options in more detail.<\/p><\/article><article><figure><img loading=\"lazy\" width=\"700\" height=\"525\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/07\/Industrial-PCB-Assembly.webp\" class=\"attachment-full size-full\" alt=\"Industrial robot operating a welding tool in a manufacturing cell\" decoding=\"async\" sizes=\"auto, (max-width: 800px) calc(100vw - 40px), 600px\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/07\/Industrial-PCB-Assembly.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/07\/Industrial-PCB-Assembly-300x225.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/07\/Industrial-PCB-Assembly-16x12.webp 16w\" \/><figcaption>Industrial application reference<\/figcaption><\/figure><h3>Rigid PI for thermally<br\/>demanding electronics<\/h3><p>Glass-reinforced PI can support multilayer circuits in industrial and instrumentation electronics where the material&#8217;s thermal behavior is part of the selection. Its role is to support and insulate the circuitry through the specified manufacturing and service conditions.<\/p><p>Fabrication begins with imaging and etching the inner copper circuits. PI cores and compatible prepregs are laminated with a cure cycle suited to that resin system. Drilled holes are prepared and metallized to connect the intended copper layers. The material choice therefore carries through into bonding and interconnect production, rather than remaining a label on the drawing.<\/p><\/article><\/div><p class=\"pi-photo-note\">Application photographs illustrate hardware categories; they do not identify a laminate grade or a customer project.<\/p><\/div><\/section>\n<section class=\"pi-section pi-supply\"><div class=\"container pi-supply-grid\"><div><p class=\"pi-kicker\">SPECIFIED MATERIAL. FINISHED BOARDS.<\/p><h2>Polyimide PCB<br\/>manufacturing with FLJ<\/h2><a class=\"btn\" href=\"https:\/\/flj-pcb.com\/bs\/contact\/\">Request a Quote<\/a><\/div><div><p>FLJ supplies PI-based boards as flexible circuits, rigid-flex assemblies and rigid multilayers. The order can include the specified film or laminate, copper construction, coverlay or solder mask, contact finish and final outline. Material identity, buildup and finished features are carried from the prototype into repeat production.<\/p><p>For populated boards, <a href=\"https:\/\/flj-pcb.com\/bs\/pcb-assembly\/\">Monta\u017ea tiskanih plo\u010dica<\/a> adds component mounting and soldering to the fabricated circuit. Send the board files, material designation or required material properties, quantity and assembly scope to start a quotation.<\/p><\/div><\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"<p>Home\/PCB Manufacturing\/Polyimide PCB POLYIMIDE \u00b7 FROM MATERIAL TO CIRCUIT Polyimide PCBMaterials &amp;Manufacturing Heat-resistant insulation. Flexible films. Rigid multilayer possibilities. FLJ [&hellip;]<\/p>\n","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":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","footer-sml-layout":"","ast-disable-related-posts":"","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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