{"id":4989,"date":"2026-06-01T09:07:14","date_gmt":"2026-06-01T09:07:14","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4989"},"modified":"2026-06-01T09:07:17","modified_gmt":"2026-06-01T09:07:17","slug":"what-is-a-truly-halogen-free-pcb","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/cs\/what-is-a-truly-halogen-free-pcb\/","title":{"rendered":"Co je skute\u010dn\u011b bezhalogenov\u00e1 deska plo\u0161n\u00fdch spoj\u016f?"},"content":{"rendered":"<p>IEC has set halogen-free standards for PCB makers, but what is a halogen-free PCB, really? Electronic products contain some specific materials. These materials may contain halogens at the highest allowed level. To create a \u201chalogen-free PCB,\u201d you need to replace some materials or reduce their use on the board. You also need to decide how much halogen can remain in the circuit. Some substitute materials need special design care, and you need to think about that too.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Halogens in PCBs<\/h2>\n\n\n\n<p>If you ask most designers where halogens are found in a PCB, they may not be sure. Halogens are usually found in brominated flame retardants (BFRs), chlorinated solvents, and polyvinyl chloride (PVC). Halogens are not always dangerous in every form or at every level. Holding a PVC pipe or drinking tap water will not cause health problems. But if you burn that pipe and breathe in the chlorine gas released when the plastic breaks down, that is a different matter. This is the main problem with halogens in electronics. They can be released at the end of the PCB life cycle. So where are halogens found in a circuit board?<\/p>\n\n\n\n<p>As you know, PVC is used not only in pipes, but also in wire insulation, so it can be a source of halogens. Chlorinated solvents can be used to clean PCBs during manufacturing. BFRs are used in PCB laminates to lower the risk of fire. Now that we have checked the main sources of halogens in a circuit, what should we do?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Halogen-Free PCB<\/h2>\n\n\n\n<p>Like the RoHS lead-free rule, the halogen-free standard asks the CM to use new materials and new manufacturing methods. Like any standard set by different groups, \u201chalogen-free\u201d has its own clear limits. IEC defines halogen-free as less than 900 ppm of chlorine and bromine, and less than 1,500 ppm of total halogens. RoHS has its own limits too.<\/p>\n\n\n\n<p>So why do people still ask for \u201chalogen-free\u201d in quotes? Because meeting the standard does not always mean your PCB has no halogens at all. For example, IPC has tests to detect halogens in PCBs, and these tests usually detect ion-bonded halogens. But most halogens found in flux are covalently bonded, so this test cannot detect them. This means that to make a truly halogen-free board, you need to go beyond the standard.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/06\/Halogen-Free-solder.webp\" alt=\"Halogen-Free solder\" class=\"wp-image-4990\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/06\/Halogen-Free-solder.webp 500w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/06\/Halogen-Free-solder-300x300.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/06\/Halogen-Free-solder-150x150.webp 150w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/06\/Halogen-Free-solder-12x12.webp 12w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<p>If you are looking for a specific halogen source, one is TBBPA, a common BFR used in laminates. To remove this source, you need to specify a halogen-free laminate, such as an active phosphorus-based laminate. Your flux and solder may also bring halogens into the PCB, so you also need to talk with the CM about possible substitutes there. Using new materials and new methods on the board can be hard, but halogen-free circuits have some benefits. Halogen-free PCBs usually have good thermal reliability, which means they are better suited for the high-temperature process needed for lead-free circuits. They also often have a lower dielectric constant, which helps if you want to keep signal integrity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Halogen-Free Board Design<\/h2>\n\n\n\n<p>The benefits of halogen-free boards come at the cost of more complexity, not only in manufacturing, but also in design. A good example is halogen-free solder and flux. Halogen-free types can sometimes change the ratio between solder and flux and cause solder beading. This is when solder forms one large ball instead of spreading across the joint. One way to solve this is to use solder mask to define the pads more clearly. This helps control solder paste and reduces defects.<\/p>\n\n\n\n<p>Many new materials have their own design limits, so you may need to check with the manufacturer or do some research before using them. The number of halogen-free boards is growing, but they are still far from common. You should also talk with your CM to see whether they can make PCBs with halogen-free materials.<\/p>\n\n\n\n<p>Over time, we seem to find more and more materials used in daily life that may bring health risks. This is why groups like IEC have developed halogen-free board standards. Remember where halogens are usually found, such as BFRs, solvents, and insulation materials, so you know what to replace if you need a halogen-free board. Different standards allow different halogen levels, and some may or may not detect certain kinds of halogens. You need to do your research first so you know where the problem areas are in your PCB. After you know which materials to use, it is best to check with your manufacturer and CM to find the best way forward. You may need to adjust the design or work with the CM on some manufacturing steps so your board can be built successfully.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>IEC has set halogen-free standards for PCB makers, but what is a halogen-free PCB, really? Electronic products contain some specific [&hellip;]<\/p>","protected":false},"author":1,"featured_media":4991,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","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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