{"id":10037,"date":"2026-06-11T00:00:39","date_gmt":"2026-06-11T00:00:39","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10037"},"modified":"2026-06-11T16:05:50","modified_gmt":"2026-06-11T16:05:50","slug":"solder-mask-photoinitiator","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/tr\/solder-mask-photoinitiator\/","title":{"rendered":"PCB Solder Mask\u0131 \u0130\u00e7in Fotoinitiator: Pigment Y\u00fck\u00fc, K\u00fcr G\u00fcvenilirli\u011fi ve LED'e Uygunluk \u0130\u00e7in Nas\u0131l Se\u00e7ilir"},"content":{"rendered":"<p><strong>H\u0131zl\u0131 cevap:<\/strong> Buyers choosing a <strong>photoinitiator for PCB solder mask<\/strong> should usually separate three different screening paths before they start comparing names: <strong>a mainstream PCB photoresist and solder-mask route<\/strong>, <strong>a darker or more opaque long-wave route for harder-to-cure films<\/strong>, and <strong>a LED-oriented package-design route that depends on a co-initiator<\/strong>. In Longchang&#8217;s current product positioning, <a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-907-cas-71868-10-5\/\">Fotoba\u015flat\u0131c\u0131 907<\/a> deserves early attention when the project is directly about <strong>PCB photoresist, solder mask ink, low yellowing, and pigment-tolerant free-radical curing<\/strong>. <a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-369-cas-119313-12-1\/\">Fotoba\u015flat\u0131c\u0131 369<\/a> moves up when the mask is <strong>darker, more opaque, or harder to cure through<\/strong> and the team wants the long-wave absorption and solder-mask relevance already supported on the company page. <a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-detx-cas-82799-44-8\/\">Fotoba\u015flat\u0131c\u0131 DETX<\/a> becomes more relevant when the line is moving toward <strong>385 to 420 nm LED-capable package design<\/strong>, thicker films, or colored systems, and the formulator is ready to build the route correctly with a co-initiator such as a tertiary amine.<\/p>\n<p>That is the practical split. PCB solder mask is not judged by cure speed alone. Buyers usually care about pigment burden, cure completeness, line wavelength, insulation-protection reliability, and whether the package still behaves well once the film is no longer an easy clear UV ink.<\/p>\n<h2>Why PCB solder mask needs a tighter shortlist than general UV inks<\/h2>\n<p>Solder mask is a permanent protective layer on the PCB. In practical board manufacturing, it is expected to help protect copper circuitry, maintain electrical isolation, and survive downstream process stress. That means a weak photoinitiator choice can create problems well beyond simple surface tack.<\/p>\n<ul>\n<li><strong>Pigment burden matters:<\/strong> solder mask is often not a clear easy-cure film, so light penetration can become a real bottleneck.<\/li>\n<li><strong>Cure reliability matters:<\/strong> a mask that looks acceptable on the surface can still leave deeper undercure risk in the film.<\/li>\n<li><strong>LED transition matters:<\/strong> some lines are still conventional UV-first, while others are screening longer-wave or LED-capable routes.<\/li>\n<li><strong>Package design matters:<\/strong> not every useful route is a simple one-product answer, especially once the formulator moves into Type II logic.<\/li>\n<\/ul>\n<p>That is why a generic \u201cphotoinitiator for UV ink\u201d answer is too loose. A better shortlist starts by deciding whether the project is mainly a <strong>mainstream PCB solder-mask screen<\/strong>, a <strong>darker or more opaque long-wave screen<\/strong>, or a <strong>LED-oriented package-design problem<\/strong>.<\/p>\n<p>For the broader electronics branch, see <a href=\"https:\/\/longchangchemical.com\/tr\/electronic-coatings-photoinitiator\/\">Photoinitiator for Electronic Coatings<\/a>.<\/p>\n<h2>Quick comparison table: 907 vs 369 vs DETX<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u00dcr\u00fcn<\/th>\n<th>Best first fit<\/th>\n<th>Why buyers shortlist it<\/th>\n<th>When it is not the first option<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-907-cas-71868-10-5\/\">907<\/a><\/td>\n<td>Mainstream PCB photoresist and solder-mask screening where low yellowing and pigment tolerance matter<\/td>\n<td>Longchang directly lists PCB photoresist and solder mask ink, plus rapid UV decomposition in the 250 to 390 nm range, low yellowing, and compatibility with pigmented systems<\/td>\n<td>When the team already knows the film is darker, more opaque, or better served by a longer-wave or LED-oriented route<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-369-cas-119313-12-1\/\">369<\/a><\/td>\n<td>Darker, more opaque, or deeper-curing solder mask and photoresist routes needing stronger long-wave response<\/td>\n<td>Longchang directly lists solder mask inks and photoresist, highlights long-wave absorption around 350 to 380 nm, and positions 369 for dark-color systems and deeper curing<\/td>\n<td>When the buyer wants the simplest mainstream PCB benchmark or does not need the stronger long-wave and deeper-cure logic<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-detx-cas-82799-44-8\/\">DETX<\/a><\/td>\n<td>LED-oriented or thicker-film package design with colored-system pressure and co-initiator support<\/td>\n<td>Longchang positions DETX for electronic materials and electronic coatings, peak absorption near 385 nm, response at 405 and 420 nm LEDs, and stronger performance in colored systems and thicker films<\/td>\n<td>When the team needs a direct one-product PCB benchmark instead of a Type II route that must be built with a co-initiator package<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>When 907 is the better fit<\/h2>\n<p>907 deserves the first screen when the project is still close to a mainstream <strong>PCB solder-mask or photoresist route<\/strong> and the team wants a supported benchmark before moving into more specialized packages.<\/p>\n<ul>\n<li><strong>PCB relevance is explicit:<\/strong> Longchang directly lists <strong>PCB photoresist<\/strong> ve <strong>solder mask ink<\/strong> as core applications.<\/li>\n<li><strong>The UV range is practical for common screening:<\/strong> the company page describes rapid radical generation with primary absorption in the <strong>250 to 390 nm<\/strong> range.<\/li>\n<li><strong>Appearance-sensitive work benefits:<\/strong> Longchang highlights <strong>low yellowing<\/strong>, which is useful in lighter-color or appearance-sensitive systems.<\/li>\n<li><strong>Pigment tolerance is already supported:<\/strong> the product page also notes good compatibility with <strong>pigmented systems<\/strong>, which matters because solder mask is not always an easy optical film.<\/li>\n<\/ul>\n<p>If the buyer wants a practical first benchmark for PCB solder mask before moving into harder-cure or LED-oriented routes, 907 is usually the cleanest place to begin.<\/p>\n<h2>When 369 is the better fit<\/h2>\n<p>369 moves up when the mask stops behaving like an easy benchmark and the team needs a route Longchang already supports for <strong>solder mask inks, photoresist, darker systems, and deeper curing<\/strong>.<\/p>\n<ul>\n<li><strong>Solder-mask relevance is direct:<\/strong> Longchang explicitly lists <strong>solder mask inks<\/strong> ve <strong>photoresist<\/strong> under electronics applications.<\/li>\n<li><strong>Long-wave response is stronger:<\/strong> the current page highlights absorption in the <strong>350 to 380 nm<\/strong> region.<\/li>\n<li><strong>Darker-system logic is already supported:<\/strong> Longchang positions 369 as particularly suitable for <strong>dark-color systems<\/strong> and for situations where deeper or pigmented cure matters.<\/li>\n<li><strong>LED discussion stays plausible:<\/strong> the company page also notes adaptation for <strong>new UV LED light sources<\/strong>, which helps when the line is not purely conventional UV anymore.<\/li>\n<\/ul>\n<p>If the real problem is pigment burden, deeper cure, or a film that is not curing comfortably under a simpler benchmark route, 369 usually deserves earlier attention than a routine mainstream candidate.<\/p>\n<h2>When DETX is the better fit<\/h2>\n<p>DETX belongs in a different decision path because the package logic changes. It becomes more relevant when the formulator wants a <strong>longer-wave or LED-capable route<\/strong> and is ready to build a proper <strong>Type II package<\/strong>.<\/p>\n<ul>\n<li><strong>Electronics relevance is already supported:<\/strong> Longchang positions DETX for <strong>electronic materials<\/strong> ve <strong>electronic coatings<\/strong>.<\/li>\n<li><strong>LED-oriented wavelength fit is stronger:<\/strong> the current page gives DETX a peak near <strong>385 nm<\/strong> and response to <strong>405 nm and 420 nm LEDs<\/strong>.<\/li>\n<li><strong>Thicker-film and colored-system value is explicit:<\/strong> Longchang also frames DETX as stronger in <strong>colored systems<\/strong> ve <strong>thicker films<\/strong>.<\/li>\n<li><strong>Package discipline matters:<\/strong> the company page makes clear that DETX is a <strong>Class II<\/strong> route that needs a co-initiator such as a tertiary amine to generate radicals efficiently.<\/li>\n<\/ul>\n<p>That means DETX should not be treated as a drop-in substitute for every PCB solder-mask package. It is better understood as a deliberate design choice when LED fit, penetration, or longer-wave behavior is part of the real process constraint.<\/p>\n<h2>How buyers should choose before requesting samples<\/h2>\n<h3>1. Start with the real film difficulty<\/h3>\n<p>Do not assume a lighter, easier-curing mask and a darker or more opaque mask should start with the same first shortlist.<\/p>\n<h3>2. Keep wavelength fit visible early<\/h3>\n<p>907 fits mainstream UV screening well, 369 moves the discussion toward stronger long-wave support, and DETX becomes more relevant when the line is leaning toward 385 to 420 nm LED-capable package design.<\/p>\n<h3>3. Separate one-product benchmarking from package design<\/h3>\n<p>If the team wants the cleanest mainstream first pass, 907 usually belongs early. If the real issue is difficult cure-through, 369 moves up. If the line needs a Type II longer-wave route, DETX only makes sense when the co-initiator package is built intentionally.<\/p>\n<h3>4. Keep the first sample round tight<\/h3>\n<p>A useful first screen is often one mainstream PCB route, one darker-film long-wave route, and one LED-oriented package-design route if that path is genuinely under review. That usually gives cleaner signal than comparing too many similar products.<\/p>\n<h3>5. Use related cluster pages to narrow the decision tree<\/h3>\n<p>If the project is closer to broad electronics protection rather than a dedicated solder-mask problem, continue with <a href=\"https:\/\/longchangchemical.com\/tr\/electronic-coatings-photoinitiator\/\">Electronic Coatings<\/a>. If the line is really a photoresist-first question, review <a href=\"https:\/\/longchangchemical.com\/tr\/photoinitiator-negative-photoresist-guide\/\">Photoinitiator for Negative Photoresist<\/a>.<\/p>\n<h2>Recommended Longchang product and article paths<\/h2>\n<ul>\n<li><strong>Mainstream PCB solder-mask route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-907-cas-71868-10-5\/\">Fotoba\u015flat\u0131c\u0131 907<\/a><\/li>\n<li><strong>Darker or more opaque long-wave route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-369-cas-119313-12-1\/\">Fotoba\u015flat\u0131c\u0131 369<\/a><\/li>\n<li><strong>LED-oriented package-design route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/product\/photoinitiator-detx-cas-82799-44-8\/\">Fotoba\u015flat\u0131c\u0131 DETX<\/a><\/li>\n<li><strong>Broader electronics article:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/electronic-coatings-photoinitiator\/\">Photoinitiator for Electronic Coatings<\/a><\/li>\n<li><strong>Photoresist article:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/photoinitiator-negative-photoresist-guide\/\">Photoinitiator for Negative Photoresist<\/a><\/li>\n<li><strong>Related printing application page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/uv-screen-ink-photoinitiator\/\">Photoinitiator for UV Screen Ink<\/a><\/li>\n<li><strong>Broader family guide:<\/strong> <a href=\"https:\/\/longchangchemical.com\/tr\/photoinitiator-selection-guide\/\">How to Choose a Photoinitiator for UV Curing<\/a><\/li>\n<\/ul>\n<h2>SSS<\/h2>\n<h3>Which photoinitiator is the best starting point for PCB solder mask?<\/h3>\n<p>In Longchang&#8217;s current product positioning, 907 is usually the strongest first benchmark when the project is directly about PCB photoresist or solder mask ink and the team wants a mainstream free-radical route.<\/p>\n<h3>When should I choose 369 instead of 907?<\/h3>\n<p>Choose 369 earlier when the mask is darker, more opaque, or harder to cure through and the process needs stronger long-wave support plus a route Longchang already positions for solder mask inks and photoresist.<\/p>\n<h3>When does DETX belong in the shortlist?<\/h3>\n<p>DETX belongs in the shortlist when the project is moving toward a 385 to 420 nm LED-capable route, thicker films, or colored-system pressure, and the formulator is ready to build a proper Type II package with a co-initiator.<\/p>\n<h3>Are 907, 369, and DETX interchangeable in PCB solder mask?<\/h3>\n<p>No. They may all enter UV-curing discussions, but Longchang&#8217;s supported application paths and cure logic are different enough that buyers should shortlist them by PCB fit, film difficulty, wavelength window, and package design rather than by name alone.<\/p>\n<h2>Need a tighter PCB solder-mask shortlist?<\/h2>\n<p>If your board process is being limited by pigment burden, weak cure-through, a move toward LED curing, or uncertainty about package design, define the real bottleneck first and then compare only the most relevant Longchang routes. That usually produces a cleaner sample plan than treating all photoinitiators as interchangeable.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical B2B guide to choosing a photoinitiator for PCB solder mask by comparing 907, 369, and DETX for pigment burden, cure depth, wavelength fit, and free-radical package design.<\/p>","protected":false},"author":6,"featured_media":10038,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10037","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Photoinitiator for PCB Solder Mask: Selection Guide for 907, 369, and DETX<\/title>\n<meta name=\"description\" content=\"Learn how to choose a photoinitiator for PCB solder mask by 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