{"id":12787,"date":"2025-09-05T18:33:20","date_gmt":"2025-09-05T10:33:20","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/?p=12787"},"modified":"2025-09-05T18:35:02","modified_gmt":"2025-09-05T10:35:02","slug":"why-your-pcb-needs-conformal-coating-when-it-is-required","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/","title":{"rendered":"Why Your PCB Needs Conformal Coating? When It Is Required?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/#What_Is_PCB_Conformal_Coating\" >What Is PCB Conformal Coating?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/#Why_Do_You_Need_Conformal_Coating\" >Why Do You Need Conformal Coating?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/#When_Is_PCB_Conformal_Coating_Required\" >When Is PCB Conformal Coating Required?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/#Risks_of_Skipping_Conformal_Coating\" >Risks of Skipping Conformal Coating<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/#Common_Misconceptions\" >Common Misconceptions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/#How_to_Choose_the_Right_Coating\" >How to Choose the Right Coating?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_PCB_Conformal_Coating\"><\/span>What Is PCB Conformal Coating?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<p><a href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/03\/what-is-pcb-conformal-coating-what-is-its-use\/\" title=\"\">Conformal coating<\/a> is a protective transparent layer applied to the surface of a <a href=\"https:\/\/www.bestpcbs.com\/index.htm\" title=\"\">printed circuit board<\/a> (PCB). It effectively shields electronic components and traces from moisture, dust, and chemical corrosion. The coating conforms precisely to the PCB\u2019s shape\u2014hence the name\u2014forming a thin, flexible &#8220;invisible armor.&#8221;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2025\/09\/image.jpg\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2025\/09\/image.jpg\" alt=\"What Is PCB Conformal Coating?\" class=\"wp-image-12788\"\/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Do_You_Need_Conformal_Coating\"><\/span>Why Do You Need Conformal Coating?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>1. Prevent Moisture-Induced Short Circuits &amp; Leakage<\/strong><\/p>\n\n\n\n<p>In high-humidity environments, moisture condensation on the PCB can cause leakage current or electrolytic corrosion, leading to system malfunctions or failure.<\/p>\n\n\n\n<p><strong>2. Resist Dust &amp; Contaminants<\/strong><\/p>\n\n\n\n<p>In industrial, automotive, or kitchen environments, dust, oil, and metal particles can accumulate on the board, creating conductive paths.<\/p>\n\n\n\n<p><strong>3. Enhance Resistance to Salt Spray &amp; Chemicals<\/strong><\/p>\n\n\n\n<p>Marine and offshore electronics are exposed to salt spray, which can rapidly oxidize solder joints and copper traces<\/p>\n\n\n\n<p><strong>4. Improve Mechanical Stability<\/strong><\/p>\n\n\n\n<p>Some coatings (e.g., silicone) are elastic, reducing stress on solder joints from vibration.<\/p>\n\n\n\n<p><strong>5. Meet Industry Standards<\/strong><\/p>\n\n\n\n<p>Sectors like automotive, medical, and military often require compliance with IPC, AEC-Q100, or MIL-STD\u2014conformal coating is a key process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"When_Is_PCB_Conformal_Coating_Required\"><\/span>When Is PCB Conformal Coating Required?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Not every PCB needs a conformal coating, but it becomes crucial when the board faces tough conditions. Think moisture, dust, chemicals, or big temperature swings\u2014these can cause corrosion, short circuits, or signal issues. Electronics in cars, airplanes, industrial machines, or outdoor lighting often need this extra layer of protection.<\/p>\n\n\n\n<p>Miniaturized or <a href=\"https:\/\/www.bestpcbs.com\/products\/HDI-board.htm\" title=\"\">high-density PCBs<\/a> also benefit from conformal coating. Tiny spaces between components increase the chance of shorts or solder joint problems. A thin protective layer helps keep the circuits safe and reliable.<\/p>\n\n\n\n<p>Boards that go through frequent heating, cooling, or vibration also get an advantage. The coating helps absorb stress, reducing cracks and extending the board\u2019s lifespan. In short, if your PCB works in a challenging environment, conformal coating is usually a smart choice. Here is a table of what applications require PCB conformal coating. <\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Application<\/strong><\/td><td><strong>Environment Challenge<\/strong><\/td><td><strong>Recommended Coating Type<\/strong><\/td><\/tr><tr><td>Automotive ECUs<\/td><td>Moisture, vibration, temperature changes<\/td><td>Polyurethane (PU)<\/td><\/tr><tr><td>Aerospace electronics<\/td><td>Extreme temperature swings, humidity<\/td><td>Silicone (SR)<\/td><\/tr><tr><td>Industrial machinery<\/td><td>Chemicals, dust, mechanical stress<\/td><td>Acrylic (AR)<\/td><\/tr><tr><td>Outdoor lighting<\/td><td>UV exposure, rain, dust<\/td><td>Parylene or UV-cured coatings<\/td><\/tr><tr><td>High-density PCBs<\/td><td>Miniaturized components, tight spacing<\/td><td>Conformal coating layer (thin PU or acrylic)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Risks_of_Skipping_Conformal_Coating\"><\/span>Risks of Skipping Conformal Coating<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u2192 <strong>Product early failure<\/strong>: Damaged within warranty, increasing after-sales cost<\/p>\n\n\n\n<p>\u2192 <strong>Customer complaints &amp; brand damage<\/strong>: Poor reliability harms reputation<\/p>\n\n\n\n<p>\u2192 <strong>Mass recall risk<\/strong>: May require full batch rework<\/p>\n\n\n\n<p>\u2192 <strong>Fail certification<\/strong>: May not pass IP, CE, or UL tests<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\"><strong>Bottom line<\/strong>: Saving on coating cost could cost ten times more in repairs<\/mark><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Misconceptions\"><\/span>Common Misconceptions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Myth 1: Only outdoor devices need coating<\/p>\n\n\n\n<p>\u2192 Humid climates, kitchen grease, and industrial dust are also threats.<\/p>\n\n\n\n<p>Myth 2: Potting can replace conformal coating<\/p>\n\n\n\n<p>\u2192 Potting is for structural protection\u2014higher cost, harder to repair. Coating is lighter and more flexible.<\/p>\n\n\n\n<p>Myth 3: Coating guarantees protection<\/p>\n\n\n\n<p>\u2192 Uneven application, bubbles, or missed areas reduce effectiveness. Process control is critical.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Choose_the_Right_Coating\"><\/span>How to Choose the Right Coating?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Type<\/strong><\/td><td><strong>Pros<\/strong><\/td><td><strong>Cons<\/strong><\/td><td><strong>Applications<\/strong><\/td><\/tr><tr><td>Acrylic<\/td><td>Easy to apply &amp; repair, low cost<\/td><td>Moderate chemical resistance<\/td><td>General industrial, consumer<\/td><\/tr><tr><td>Polyurethane<\/td><td>Good chemical &amp; moisture resistance<\/td><td>Hard to repair<\/td><td>Automotive, outdoor<\/td><\/tr><tr><td>Silicone<\/td><td>High temp resistance, flexible<\/td><td>Higher cost<\/td><td>High-temp, LED lighting<\/td><\/tr><tr><td>UV-Curable<\/td><td>Fast cure, precise coverage<\/td><td>Requires UV lamp, shadow areas hard to coat<\/td><td>Precision modules, selective coating<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/09\/why-your-pcb-needs-conformal-coating-when-it-is-required\/\" title=\"\">PCB conformal coating<\/a> is not optional\u2014it\u2019s essential for improving product reliability, lifespan, and market competitiveness.<\/p>\n\n\n\n<p><strong>Recommendation<\/strong>: Evaluate coating needs early in design. Reserve keep-out zones and protect test points to avoid rework.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What Is PCB Conformal Coating? Conformal coating is a protective transparent layer applied to the surface of a printed circuit board (PCB). It effectively shields electronic components and traces from moisture, dust, and chemical corrosion. The coating conforms precisely to the PCB\u2019s shape\u2014hence the name\u2014forming a thin, flexible &#8220;invisible armor.&#8221; Why Do You Need Conformal [&hellip;]<\/p>\n","protected":false},"author":623,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[175,174,37,3,161],"tags":[],"class_list":["post-12787","post","type-post","status-publish","format-standard","hentry","category-best-pcb","category-bestpcb","category-faq","category-pcb-news","category-pcba"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/12787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/users\/623"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/comments?post=12787"}],"version-history":[{"count":2,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/12787\/revisions"}],"predecessor-version":[{"id":12795,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/12787\/revisions\/12795"}],"wp:attachment":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/media?parent=12787"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/categories?post=12787"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/tags?post=12787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}