{"id":10414,"date":"2026-07-04T00:00:40","date_gmt":"2026-07-04T00:00:40","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10414"},"modified":"2026-07-04T02:09:12","modified_gmt":"2026-07-04T02:09:12","slug":"369-vs-1206-vs-784","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/369-vs-1206-vs-784\/","title":{"rendered":"369 vs 1206 vs 784: Which Photoinitiator Fits Dark Photoresist and Imaging Systems?"},"content":{"rendered":"<p><strong>R\u00e9ponse rapide :<\/strong> Buyers comparing <strong>Photoinitiateur 369<\/strong>, <strong>Photoinitiateur 1206<\/strong>et <strong>Photoinitiateur 784<\/strong> usually get the cleanest shortlist when they separate three different jobs instead of treating every dark imaging system as the same formulation problem. <a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-369-cas-119313-12-1\/\">Photoinitiateur 369<\/a> is the better starting point when the real issue is <strong>long-wave cure-through<\/strong>, <strong>darker optical paths<\/strong>et <strong>photoresist or printing-plate systems that need stronger 350 to 380 nm response<\/strong>. <a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-1206\/\">Photoinitiateur 1206<\/a> moves ahead when the job is really about <strong>high-sensitivity 365 nm imaging<\/strong>, <strong>ultra-thin films<\/strong>et <strong>black-pigment-sensitive systems<\/strong>. <a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-784-cas-125051-32-3\/\">Photoinitiateur 784<\/a> becomes the stronger route when the process is tied to <strong>visible-light curing<\/strong>, <strong>laser direct imaging<\/strong>, or <strong>higher-precision photosensitive layers<\/strong>.<\/p>\n<p>That is the commercially useful split. These three products can all appear in imaging discussions, but they do not solve the same first-screen problem.<\/p>\n<h2>Pourquoi cette comparaison m\u00e9rite sa propre page<\/h2>\n<p>Longchang already has live application pages for <a href=\"https:\/\/longchangchemical.com\/fr\/flexographic-plate-photoinitiator\/\">flexographic plates<\/a>, <a href=\"https:\/\/longchangchemical.com\/fr\/dry-film-photoresist-photoinitiator\/\">dry film photoresists<\/a>, <a href=\"https:\/\/longchangchemical.com\/fr\/laser-direct-imaging-photoinitiator\/\">laser direct imaging<\/a>, <a href=\"https:\/\/longchangchemical.com\/fr\/photosensitive-ink-photoinitiator\/\">photosensitive inks<\/a>et <a href=\"https:\/\/longchangchemical.com\/fr\/printing-plate-photoinitiator\/\">printing plates<\/a>. But buyers still hit a narrower decision point before they sample: <strong>should the first shortlist start with 369, 1206, or 784?<\/strong><\/p>\n<p>That decision intent is different from a single-application article. It sits one level higher, where teams are trying to map exposure source, pigment burden, film build, and imaging precision to the right first sample round.<\/p>\n<h2>What dark imaging-system buyers usually check first<\/h2>\n<p>Across dry film photoresist and other industrial photoimaging workflows, external process references consistently frame the selection problem around <strong>exposure wavelength<\/strong>, <strong>patterning method<\/strong>, <strong>resolution pressure<\/strong>et <strong>chemical or process robustness<\/strong>. Public dry-film material from Asahi Kasei, for example, emphasizes <strong>LDI compatibility<\/strong> et <strong>high resolution<\/strong>, while general PCB photoimaging references describe practical splits between conventional UV exposure and <strong>laser direct imaging<\/strong>. That framing is useful here, even though product truth still comes from Longchang&#8217;s own product pages.<\/p>\n<ul>\n<li><strong>Is the line centered on 365 nm sensitivity or on longer-wave cure-through?<\/strong><\/li>\n<li><strong>Is the imaging layer ultra-thin, or is light penetration becoming harder because the system is darker or more demanding?<\/strong><\/li>\n<li><strong>Does the process stay in conventional UV, or does it move toward visible-light or laser exposure?<\/strong><\/li>\n<li><strong>Is the system closer to black-sensitive photoresist, printing-plate imaging, or a more advanced precision photosensitive layer?<\/strong><\/li>\n<\/ul>\n<p>Those questions usually narrow the shortlist faster than comparing product names in the abstract.<\/p>\n<h2>Quick comparison table: 369 vs 1206 vs 784<\/h2>\n<table>\n<thead>\n<tr>\n<th>Facteur d'achat<\/th>\n<th>369<\/th>\n<th>1206<\/th>\n<th>784<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Direct company-supported relevance<\/td>\n<td>Photoresist, solder mask inks, photopolymers for imaging applications, printing plates, dark-color systems<\/td>\n<td>Photosensitive inks, electronic material inks, TFT-LCD color filters, black pigment systems, ultra-thin 1 to 30 \u03bcm films<\/td>\n<td>Photosensitive layers, laser direct imaging, 3D lithography, visible-light and laser-capable precision imaging<\/td>\n<\/tr>\n<tr>\n<td>Best first-screen wavelength logic<\/td>\n<td>Strong long-wave UV response at 350 to 380 nm<\/td>\n<td>High sensitivity at 365 nm<\/td>\n<td>UV, visible light, or suitable laser irradiation<\/td>\n<\/tr>\n<tr>\n<td>Main first-fit problem<\/td>\n<td>Darker or harder-to-penetrate imaging systems<\/td>\n<td>Ultra-thin black-sensitive or colored films needing strong 365 nm response<\/td>\n<td>Precision imaging platforms with visible-light or laser exposure<\/td>\n<\/tr>\n<tr>\n<td>Useful first applications<\/td>\n<td>Printing plates, darker photoresist, pigmented imaging photopolymers<\/td>\n<td>Thin dry film, black-sensitive imaging layers, display-style thin films<\/td>\n<td>Laser direct imaging, precision photosensitive layers, advanced imaging routes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>When 369 is the better fit<\/h2>\n<p>369 should move to the front when the real risk is <strong>cure-through in a darker or optically harder imaging system<\/strong>, not just basic thin-film sensitivity. Longchang&#8217;s current 369 product page directly supports use in <strong>photoresist<\/strong>, <strong>solder mask inks<\/strong>, <strong>photopolymers for imaging applications<\/strong>et <strong>printing plates<\/strong>. The same page also states that 369 is especially suitable for <strong>pigmented UV-curable systems<\/strong> and captures <strong>long-wave ultraviolet light at 350 to 380 nm<\/strong>.<\/p>\n<p>That usually makes 369 the better first sample when:<\/p>\n<ul>\n<li>the imaging layer is darker, more pigmented, or harder for light to penetrate<\/li>\n<li>the team wants more confidence in long-wave response before broadening the screen<\/li>\n<li>the project sits close to printing-plate imaging, photoresist, or solder-mask-adjacent work<\/li>\n<li>the main concern is not only speed at 365 nm, but whether the energy reaches where it needs to go<\/li>\n<\/ul>\n<p>If the bottleneck is penetration in a demanding imaging layer, 369 is usually the more defensible first move.<\/p>\n<h2>When 1206 is the better fit<\/h2>\n<p>1206 should lead the shortlist when the system behaves like a <strong>high-sensitivity 365 nm thin-film job<\/strong> and the buyer needs a route that is explicitly supported for <strong>black-pigment-sensitive<\/strong> or <strong>colored<\/strong> imaging layers. Longchang&#8217;s current 1206 product page states that the product has <strong>high sensitivity to 365 nm wavelength<\/strong>, is suitable for <strong>colored systems including black pigment systems<\/strong>, can withstand up to <strong>35 wt% carbon black pigment<\/strong>, and fits <strong>ultra-thin film 1 to 30 \u03bcm curing systems<\/strong>. The same page also supports application fit in <strong>TFT-LCD color filters<\/strong>, <strong>photosensitive inks<\/strong>et <strong>electronic material inks<\/strong>.<\/p>\n<p>That pushes 1206 forward when:<\/p>\n<ul>\n<li>the line is centered on a 365 nm process window<\/li>\n<li>the film build is very thin and image sensitivity matters more than deep cure-through<\/li>\n<li>black pigment burden is a real screening issue<\/li>\n<li>the buyer wants a route that behaves closer to thin display-style or precision electronic imaging layers than to a broader printing-plate system<\/li>\n<\/ul>\n<p>In practical buyer language, 1206 is the first product to test when the job is thin, dark, and 365 nm-sensitive.<\/p>\n<h2>When 784 becomes the stronger route<\/h2>\n<p>784 sits in a different lane because it is directly supported for <strong>visible-light and laser-capable precision imaging<\/strong>. Longchang positions 784 for <strong>photosensitive layers<\/strong>, <strong>laser direct imaging<\/strong>, <strong>three-dimensional lithography<\/strong>, and other high-value imaging routes. The current product page also states that curing can be carried out under <strong>ultraviolet light, visible light, or suitable laser irradiation<\/strong>. That makes 784 the strongest first route when the process is no longer just a conventional UV photoresist benchmark.<\/p>\n<p>784 usually deserves earlier attention when:<\/p>\n<ul>\n<li>laser direct imaging is part of the real manufacturing route<\/li>\n<li>the process needs visible-light response rather than only conventional UV matching<\/li>\n<li>the team is qualifying a higher-precision photosensitive layer<\/li>\n<li>the line is closer to advanced electronic imaging or information-storage-style patterning than to standard printing-plate exposure<\/li>\n<\/ul>\n<p>If the real selection problem is platform change, not only pigment burden, 784 usually becomes the better lead candidate.<\/p>\n<h2>How buyers should choose before requesting samples<\/h2>\n<h3>1. Start with the exposure platform, not the product list<\/h3>\n<p>Ask first whether the line is a 365 nm thin-film route, a darker long-wave cure-through problem, or a visible-light or laser imaging platform. That one decision often removes half the shortlist.<\/p>\n<h3>2. Keep optical difficulty visible<\/h3>\n<p>Dark or pigment-loaded imaging layers should not be screened the same way as cleaner thin-film systems. Cure-through pressure matters.<\/p>\n<h3>3. Separate thin-film sensitivity from precision-platform fit<\/h3>\n<p>A product that is excellent for ultra-thin 365 nm imaging is not automatically the best first screen for a laser-oriented precision imaging line.<\/p>\n<h3>4. Do not collapse printing-plate and precision-imaging logic into one bucket<\/h3>\n<p>369 and 784 can both appear in imaging discussions, but the buyer problem they solve first is different. One is usually about harder penetration and long-wave response, while the other is more often about visible-light or laser-route precision.<\/p>\n<h3>5. Keep the first lab round tight<\/h3>\n<p>For many teams, the cleanest first round is one long-wave dark-system benchmark, one 365 nm black-sensitive thin-film benchmark, and one visible-light or laser benchmark only when the platform actually needs it.<\/p>\n<h2>Chemins recommand\u00e9s pour les produits et articles Longchang<\/h2>\n<ul>\n<li><strong>Long-wave dark imaging route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-369-cas-119313-12-1\/\">Photoinitiateur 369<\/a><\/li>\n<li><strong>365 nm thin black-sensitive route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-1206\/\">Photoinitiateur 1206<\/a><\/li>\n<li><strong>Visible-light or laser route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/product\/photoinitiator-784-cas-125051-32-3\/\">Photoinitiateur 784<\/a><\/li>\n<li><strong>Related application page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/dry-film-photoresist-photoinitiator\/\">Photoinitiator for Dry Film Photoresist<\/a><\/li>\n<li><strong>Related application page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/flexographic-plate-photoinitiator\/\">Photoinitiator for Flexographic Plates<\/a><\/li>\n<li><strong>Related application page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/fr\/laser-direct-imaging-photoinitiator\/\">Photoinitiator for Laser Direct Imaging<\/a><\/li>\n<\/ul>\n<h2>FAQ<\/h2>\n<h3>Which photoinitiator is best for dark photoresist?<\/h3>\n<p>It depends on what \u201cdark\u201d means in the actual process. 369 is usually the stronger first screen when the key problem is long-wave cure-through in darker or harder imaging layers, while 1206 is often better when the system is ultra-thin, black-sensitive, and strongly tied to 365 nm response.<\/p>\n<h3>When should buyers start with 1206 instead of 369?<\/h3>\n<p>Start with 1206 when the line is built around 365 nm exposure, ultra-thin films, and black-sensitive or colored imaging layers where high sensitivity matters more than longer-wave penetration.<\/p>\n<h3>When does 784 belong in the shortlist?<\/h3>\n<p>784 belongs in the shortlist when visible-light curing, laser direct imaging, or precision photosensitive-layer qualification is central to the process.<\/p>\n<h3>Are 369, 1206, and 784 interchangeable?<\/h3>\n<p>No. They overlap broadly in photoimaging discussions, but their company-supported wavelength logic, application positioning, and first-fit use cases are different enough that buyers should not treat them as plug-and-play substitutes.<\/p>\n<h2>Need a tighter shortlist for dark imaging work?<\/h2>\n<p>If your team is screening darker photoresist, black-sensitive imaging layers, or laser-oriented imaging routes, define the real bottleneck first: <strong>penetration<\/strong>, <strong>365 nm thin-film sensitivity<\/strong>, or <strong>visible-light or laser precision<\/strong>. That usually points to the right Longchang product path much faster than starting from a generic imaging-grade list.<\/p>","protected":false},"excerpt":{"rendered":"<p>A B2B comparison guide for buyers choosing between Photoinitiator 369, 1206, and 784 for dark photoresist, black-sensitive imaging layers, dry film, printing plate, and laser-oriented precision imaging work.<\/p>","protected":false},"author":6,"featured_media":10415,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10414","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>369 vs 1206 vs 784: Photoinitiator Selection for Dark Imaging Systems<\/title>\n<meta name=\"description\" content=\"Compare Photoinitiator 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