{"id":9943,"date":"2026-06-08T08:39:21","date_gmt":"2026-06-08T08:39:21","guid":{"rendered":"https:\/\/longchangchemical.com\/photoinitiator-184-vs-1173-vs-819\/"},"modified":"2026-06-09T03:41:05","modified_gmt":"2026-06-09T03:41:05","slug":"photoinitiator-184-vs-1173-vs-819","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/photoinitiator-184-vs-1173-vs-819\/","title":{"rendered":"Photoinitiator 184 vs 1173 vs 819: How to Choose for UV Curing"},"content":{"rendered":"<p><strong>Resposta r\u00e1pida:<\/strong> Come\u00e7ar com <a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-184-cas-947-19-3\/\">Fotoiniciador 184<\/a> when you need a practical benchmark for routine low to medium-thickness UV coatings, inks, or adhesives. Move <a href=\"https:\/\/longchangchemical.com\/pt\/product\/irgacure-1173-cas-7473-98-5\/\">Fotoiniciador 1173<\/a> higher on the shortlist when liquid handling, blendability, and lower-yellowing clear systems matter more. Push <a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">Fotoiniciador 819<\/a> forward when the system is thicker, more pigmented, or harder to cure through.<\/p>\n<p>That is the practical commercial split. These three photoinitiators sit in the same buying conversation, but they should not be treated as interchangeable.<\/p>\n<h2>Side-by-side shortlist: 184 vs 1173 vs 819<\/h2>\n<table>\n<thead>\n<tr>\n<th>Produto<\/th>\n<th>Melhor primeiro ajuste<\/th>\n<th>Por que os compradores o incluem na lista de finalistas<\/th>\n<th>Quando n\u00e3o \u00e9 a primeira op\u00e7\u00e3o<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-184-cas-947-19-3\/\">Fotoiniciador 184<\/a><\/td>\n<td>Routine low to medium-thickness UV coatings, inks, and adhesives<\/td>\n<td>Type I free-radical route, strong 365 nm relevance on the current Longchang page, and a practical benchmark for fast curing in clear or lighter-color systems<\/td>\n<td>When the main problem is deep cure, heavy pigmentation, or a broader-response curing window<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/pt\/product\/irgacure-1173-cas-7473-98-5\/\">Fotoiniciador 1173<\/a><\/td>\n<td>Clear acrylic varnishes and formulation programs that benefit from liquid handling<\/td>\n<td>Liquid form, easy blending, good compatibility, and lower-yellowing positioning for acrylic UV-curable varnishes on paper, metal, and plastic<\/td>\n<td>When the system is thick, optically difficult, or under stronger through-cure pressure<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">Fotoiniciador 819<\/a><\/td>\n<td>Thicker coatings, pigmented systems, and LED-related screening<\/td>\n<td>Broad 370 to 450 nm absorption positioning, deep-cure support, and stronger fit for pigmented or harder-to-cure systems<\/td>\n<td>When the job is a simple thin clear system and deeper-cure power is not the main bottleneck<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Se precisar da vis\u00e3o mais ampla da fam\u00edlia primeiro, comece com a de Longchang <a href=\"https:\/\/longchangchemical.com\/pt\/photoinitiator-selection-guide\/\">guia de sele\u00e7\u00e3o de fotoiniciador<\/a>.<\/p>\n<h2>Quando o fotoiniciador 184 \u00e9 a melhor op\u00e7\u00e3o<\/h2>\n<p>184 is the most useful first benchmark when the job is conventional free-radical UV curing and the team wants a familiar starting point.<\/p>\n<ul>\n<li><strong>Routine coatings and inks:<\/strong> Longchang positions it across wood, plastic, metal, paper, multiple printing-ink routes, and UV-curable adhesives.<\/li>\n<li><strong>Low to medium film thickness:<\/strong> the current product page ties 184 to fast curing in low to medium-thickness coatings, inks, and glues.<\/li>\n<li><strong>Clear or lighter-color systems:<\/strong> the current page also emphasizes low yellowing and use in transparent or lighter-color applications.<\/li>\n<\/ul>\n<p>If you are screening a UV formulation and need the fastest practical reference point, 184 is often the right first sample.<\/p>\n<h2>Quando o Fotoiniciador 1173 \u00e9 o mais adequado<\/h2>\n<p>1173 deserves earlier attention when the project benefits from liquid handling, easier blending, and lower-yellowing performance in acrylic UV-curable systems.<\/p>\n<ul>\n<li><strong>Conveni\u00eancia no manuseio de l\u00edquidos:<\/strong> Longchang describes 1173 as a liquid photoinitiator, which can simplify formulation work compared with solid alternatives.<\/li>\n<li><strong>Clear coatings and varnishes:<\/strong> the current page recommends it for acrylic UV-curable varnishes on paper, metal, and plastic surfaces, especially where only slight yellowing is needed after long sunlight exposure.<\/li>\n<li><strong>Flexibilidade de mistura:<\/strong> Longchang also states that 1173 has good compatibility and can be easily mixed with other photoinitiators and prepolymers.<\/li>\n<\/ul>\n<p>If the buyer is working on a clear or color-sensitive acrylic system, 1173 is often a better commercial reference than a purely routine benchmark.<\/p>\n<h2>Quando o fotoiniciador 819 \u00e9 a melhor op\u00e7\u00e3o<\/h2>\n<p>819 should move up the shortlist when the project is no longer a simple thin-film screening job.<\/p>\n<ul>\n<li><strong>Deeper cure demand:<\/strong> Longchang&#8217;s current page highlights deep curing and a bleaching effect that helps light penetration.<\/li>\n<li><strong>Pigmented or optically difficult systems:<\/strong> the same page positions 819 for pigmented systems, thick coatings, and harder curing conditions.<\/li>\n<li><strong>Broader-response and LED-related work:<\/strong> Longchang also presents 819 as suitable for UV-LED light sources and broader-response curing windows.<\/li>\n<li><strong>Thicker sections:<\/strong> 819 is positioned for thick coatings and deeper-section curing where weaker candidates may lose performance.<\/li>\n<\/ul>\n<p>If the job involves pigmented UV inks, thick sections, or harder through-cure problems, 819 usually deserves earlier sampling than 184 or 1173. Readers working specifically on ink systems can also review <a href=\"https:\/\/longchangchemical.com\/pt\/photoinitiator-uv-inks-guide\/\">this UV inks guide<\/a>.<\/p>\n<h2>Como os compradores devem escolher antes de amostrar<\/h2>\n<h3>1. Combine a fonte de cura primeiro<\/h3>\n<p>Start with the lamp and wavelength window. If the photoinitiator does not fit the real curing source, the rest of the comparison becomes noisy.<\/p>\n<h3>2. Judge film thickness honestly<\/h3>\n<p>Thin clear layers and thicker pigmented sections should not use the same default shortlist.<\/p>\n<h3>3. Check pigment load early<\/h3>\n<p>Pigment often changes the ranking quickly because it reduces light penetration and raises through-cure pressure.<\/p>\n<h3>4. Decide how sensitive the system is to yellowing<\/h3>\n<p>If appearance matters, the lower-yellowing positioning of 184 and 1173 becomes more important.<\/p>\n<h3>5. Keep formulation practicality in scope<\/h3>\n<p>Physical form and blending behavior still matter. A liquid product with easier handling can shorten development time.<\/p>\n<p>For a coating-focused selection workflow, also see <a href=\"https:\/\/longchangchemical.com\/pt\/selection-of-photoinitiators-in-uv-coating-formulations\/\">Sele\u00e7\u00e3o de Fotoiniciadores em Formula\u00e7\u00f5es de Revestimentos UV<\/a>. Se o comprador ainda est\u00e1 decidindo entre mecanismos de cura primeiro, a compara\u00e7\u00e3o em tempo real de <a href=\"https:\/\/longchangchemical.com\/pt\/comparison-of-uv-free-radical-and-cationic-curing\/\">rotas de fotoiniciadores de c\u00e1tions e radicais livres<\/a> \u00e9 o melhor ponto de partida.<\/p>\n<h2>Caminhos de produtos recomendados em Longchang<\/h2>\n<ul>\n<li><strong>Routine free-radical benchmark:<\/strong> <a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-184-cas-947-19-3\/\">Fotoiniciador 184<\/a><\/li>\n<li><strong>Liquid low-yellowing acrylic route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/pt\/product\/irgacure-1173-cas-7473-98-5\/\">Fotoiniciador 1173<\/a><\/li>\n<li><strong>Deep-cure and pigmented-system route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">Fotoiniciador 819<\/a><\/li>\n<li><strong>Guia de sele\u00e7\u00e3o mais amplo:<\/strong> <a href=\"https:\/\/longchangchemical.com\/pt\/photoinitiator-selection-guide\/\">Como escolher um fotoiniciador para cura UV<\/a><\/li>\n<li><strong>Artigo relacionado sobre revestimentos:<\/strong> <a href=\"https:\/\/longchangchemical.com\/pt\/selection-of-photoinitiators-in-uv-coating-formulations\/\">Sele\u00e7\u00e3o de Fotoiniciadores em Formula\u00e7\u00f5es de Revestimentos UV<\/a><\/li>\n<li><strong>Compara\u00e7\u00e3o de qu\u00edmica relacionada:<\/strong> <a href=\"https:\/\/longchangchemical.com\/pt\/comparison-of-uv-free-radical-and-cationic-curing\/\">Iniciador cati\u00f4nico vs. iniciador de radical livre<\/a><\/li>\n<\/ul>\n<h2>PERGUNTAS FREQUENTES<\/h2>\n<h3>Is Photoinitiator 184 or 1173 better for clear coatings?<\/h3>\n<p>Both can be relevant, but 1173 deserves stronger consideration when liquid handling, blending convenience, and low-yellowing behavior in acrylic UV-curable varnish systems matter more. 184 remains a practical benchmark for routine UV-curing work.<\/p>\n<h3>Quando devo mudar de 184 ou 1173 para 819?<\/h3>\n<p>Move 819 higher in the shortlist when the project needs more support for thicker films, pigmented systems, deeper cure, or UV-LED-related curing windows.<\/p>\n<h3>Which product is stronger for pigmented UV inks?<\/h3>\n<p>Based on the current Longchang product positioning, 819 is the stronger first review point when pigment load and deeper cure become the main concern.<\/p>\n<h3>Can 184, 1173, and 819 be used in blends?<\/h3>\n<p>Longchang&#8217;s current product pages indicate blending logic is relevant in this family, especially for 1173, and the 184 and 819 pages also discuss combination use. Final blend choice should still follow the actual curing window, formulation system, and sample results.<\/p>\n<h2>Need help narrowing the shortlist?<\/h2>\n<p>If your UV coatings, inks, or adhesives project is limited by yellowing, cure depth, pigment load, or lamp fit, define the real bottleneck first and then compare 184, 1173, and 819 against that constraint. Longchang can then help narrow the most relevant product path and sample set.<\/p>","protected":false},"excerpt":{"rendered":"<p>Compare Photoinitiator 184, 1173, and 819 for UV coatings, inks, and adhesives, with practical guidance on lamp fit, yellowing control, formulation convenience, and pigmented systems.<\/p>","protected":false},"author":6,"featured_media":9973,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-9943","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Photoinitiator 184 vs 1173 vs 819: How to Choose for UV Curing - Longchang Chemical<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/pt\/photoinitiator-184-vs-1173-vs-819\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Photoinitiator 184 vs 1173 vs 819: How to Choose for UV Curing - 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