{"id":10549,"date":"2026-07-11T00:00:37","date_gmt":"2026-07-11T00:00:37","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10549"},"modified":"2026-07-11T02:11:32","modified_gmt":"2026-07-11T02:11:32","slug":"2750-vs-2760-vs-2780-vs-2505","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/nl\/2750-vs-2760-vs-2780-vs-2505\/","title":{"rendered":"CHLUMIAG\u00ae 2750 vs 2760 vs 2780 vs 2505: How to Choose the Right Reactive Grade for UV Surface Control"},"content":{"rendered":"<p><strong>Snel antwoord:<\/strong> kopers zouden niet moeten behandelen <strong>CHLUMIAG\u00ae 2750, 2760, 2780, and 2505<\/strong> as four unrelated reactive additives. The current Longchang family page supports one shared reactive route with <strong>reactive acrylic functional groups<\/strong>, <strong>radiation-curing suitability<\/strong>, En <strong>crosslinking into the polymer network structure<\/strong>. The first real split is usually this: <strong>2750<\/strong> should move up first when the project is closer to <strong>reverse varnish<\/strong> or a reactive UV route where surface smoothness and tape resistance matter. <strong>2780<\/strong> should move up first when the buyer is closer to <strong>antiblokkeermiddel<\/strong> of <strong>anti-graffiti<\/strong> handling. <strong>2760<\/strong> en <strong>2505<\/strong> are most useful when the buyer has already decided the reactive-family direction is right and now needs a <strong>different viscosity window<\/strong> for formulation handling or process fit rather than a different chemistry story.<\/p>\n<p>Deze pagina is smaller dan de bredere <a href=\"https:\/\/longchangchemical.com\/nl\/anti-blocking-additives-coatings-inks\/\">anti-blocking additive guide<\/a> and different from the already-live <a href=\"https:\/\/longchangchemical.com\/nl\/2750-vs-2780\/\">2750 vs 2780<\/a> comparison. That earlier page helps buyers choose the first reactive direction. This page is the next step for buyers who need to choose the <strong>right grade inside the 2750 family<\/strong>.<\/p>\n<h2>Why this reactive family needs a dedicated grade-selection page<\/h2>\n<p>In many B2B coating and ink projects, the lab first decides on a chemistry direction and only then discovers that the <strong>grade window<\/strong> still matters. Longchang\u2019s current public family page already gives enough support for that second-stage decision. The family is positioned for <strong>UV-systemen<\/strong> en <strong>oplossingssystemen<\/strong>, not for water-based systems, with a <strong>recommended dosage of 0.1% to 3%<\/strong> en <strong>addition at any stage of production<\/strong>. The same page also gives separate viscosity windows for the four grades:<\/p>\n<ul>\n<li><strong>2750:<\/strong> 1000 to 4000 mPa.s<\/li>\n<li><strong>2760:<\/strong> 1000 to 8000 mPa.s<\/li>\n<li><strong>2780:<\/strong> 5000 to 30000 mPa.s<\/li>\n<li><strong>2505:<\/strong> 4000 to 12000 mPa.s<\/li>\n<\/ul>\n<p>That means buyers can use one page for the first chemistry choice and another page, this one, for the <strong>grade-selection and handling-fit choice<\/strong>.<\/p>\n<h2>Quick comparison table: when each grade is the better first screen<\/h2>\n<table>\n<thead>\n<tr>\n<th>Rang<\/th>\n<th>Beste first fit<\/th>\n<th>Waarom kopers het op hun shortlist zetten<\/th>\n<th>Hoofdobservatiepunt<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>2750<\/strong><\/td>\n<td>Reactive UV work closer to reverse varnish and cured-film surface fixation<\/td>\n<td>Longchang explicitly says 2750 is more suitable for reverse varnish and supports the family with reactive acrylic functionality, surface smoothness, and tape resistance<\/td>\n<td>If the project is really anti-blocking or anti-graffiti-led, 2780 is usually the stronger first direction<\/td>\n<\/tr>\n<tr>\n<td><strong>2760<\/strong><\/td>\n<td>Same-family option when the reactive 2750-type route is directionally right but the process needs a broader mid-range viscosity window<\/td>\n<td>Longchang gives 2760 its own 1000 to 8000 mPa.s viscosity band inside the same reactive UV family<\/td>\n<td>The public page does not give it a separate application story as explicit as 2750 or 2780, so it should be chosen honestly as a same-family process-fit grade<\/td>\n<\/tr>\n<tr>\n<td><strong>2780<\/strong><\/td>\n<td>Reactive UV or solvent-side work closer to anti-blocking and anti-graffiti surface control<\/td>\n<td>Longchang explicitly says 2780 is more commonly used in anti-blocking and anti-graffiti applications<\/td>\n<td>If the buyer really needs reverse-varnish-first logic, 2750 is usually the cleaner first route<\/td>\n<\/tr>\n<tr>\n<td><strong>2505<\/strong><\/td>\n<td>Same-family option when the chemistry direction is already right but a higher viscosity window is a better process match<\/td>\n<td>Longchang gives 2505 its own 4000 to 12000 mPa.s viscosity band inside the same reactive family<\/td>\n<td>Like 2760, its strongest current public role is grade-window selection, not a separate headline application story<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>What the whole 2750 family shares before you split grades<\/h2>\n<p>Before choosing a grade, it helps to remember what the family already shares on the current Longchang page. The family is positioned with <strong>reactive acrylic functional groups<\/strong> and is described as <strong>crosslinking into the polymer network structure<\/strong> in radiation-curing systems. Longchang also supports the family with <strong>uitstekende nivellering<\/strong>, <strong>oppervlaktegladheid<\/strong>, En <strong>tape resistance<\/strong>. The family is shown as suitable for <strong>UV-systemen<\/strong> en <strong>oplossingssystemen<\/strong>, but <strong>not for water-based systems<\/strong>. Longchang also says the products can be added <strong>at any stage<\/strong> and should be stored <strong>sealed, away from high temperature and strong light<\/strong>, with a <strong>mix-with-caution<\/strong> note.<\/p>\n<p>That shared base matters because it keeps buyers from over-interpreting the four numbers as four unrelated chemistries. The family decision is usually already made before the grade decision starts.<\/p>\n<h2>When 2750 is the better fit<\/h2>\n<p><strong>CHLUMIAG\u00ae 2750<\/strong> should move up first when the project is driven by <strong>reverse varnish<\/strong> or by the desire to use a more clearly framed reactive UV surface-control route. Longchang\u2019s current public wording says <strong>2750 is more suitable for reverse varnish<\/strong>. That matters because it gives the grade a distinct first-screen job inside a family where several grades otherwise share the same reactive base story.<\/p>\n<p>2750 also makes sense when the buyer wants the family\u2019s reactive-network fixation, surface smoothness, and tape-resistance story but does not need to start from an anti-blocking or anti-graffiti problem. In practical buying terms, 2750 is the grade to move forward first when the question is, \u201cWhich family member is most clearly aligned with reverse-varnish-led UV work?\u201d<\/p>\n<h2>When 2780 is the better fit<\/h2>\n<p><strong>CHLUMIAG\u00ae 2780<\/strong> should move up first when the coating or ink project is closer to <strong>antiblokkeermiddel<\/strong> of <strong>anti-graffiti<\/strong> performance. Longchang\u2019s current public family page explicitly says <strong>2780 is more commonly used in anti-blocking and anti-graffiti applications<\/strong>. That is the strongest current company-supported reason to separate it from 2750.<\/p>\n<p>Commercially, that makes 2780 the more logical first screen when the project brief is not about reverse varnish, but about cleaner surface separation, easier handling after contact, or broader easy-clean style performance inside the reactive family. Buyers should still remember that it remains part of the same UV and solvent reactive family rather than a completely different chemistry lane.<\/p>\n<h2>When 2760 is the better fit<\/h2>\n<p><strong>CHLUMIAG\u00ae 2760<\/strong> matters when the buyer has already decided that the 2750-family reactive route is directionally correct but needs a <strong>different viscosity window<\/strong> for process integration. The current Longchang page gives 2760 a <strong>1000 to 8000 mPa.s<\/strong> viscosity range, which places it above 2750 on the upper end while still staying below the much wider 2780 range.<\/p>\n<p>That does not justify inventing a separate application story. The stronger and safer B2B use of 2760 is as a <strong>same-family mid-window option<\/strong> when the reverse-varnish or reactive-surface-control direction is already accepted, but the team wants a different handling window for the formulation or production step.<\/p>\n<h2>When 2505 is the better fit<\/h2>\n<p><strong>CHLUMIAG\u00ae 2505<\/strong> belongs in the shortlist for the same reason 2760 does, but with a different grade window. Longchang gives 2505 a <strong>4000 to 12000 mPa.s<\/strong> viscosity range, which makes it a practical same-family option when the buyer wants a higher viscosity band than 2750 and a narrower band than the broad upper reach of 2780.<\/p>\n<p>Again, the safer company-supported position is not to invent a new headline application story for 2505. Its current strength is that it gives a buyer another <strong>process-fit grade<\/strong> inside a reactive UV family that already matches the broader commercial job.<\/p>\n<h2>How buyers should narrow the first sample round<\/h2>\n<h3>1. Choose the first surface-control job before the grade window<\/h3>\n<p>If the project is clearly reverse-varnish-led, start with 2750. If it is clearly anti-blocking or anti-graffiti-led, start with 2780. Only after that should 2760 or 2505 move up as same-family grade-window options.<\/p>\n<h3>2. Do not pretend 2760 or 2505 are separate chemistry stories if the public evidence does not support that<\/h3>\n<p>The current Longchang page supports distinct application direction most clearly for 2750 and 2780. Use 2760 and 2505 honestly, as grade-window choices inside the family.<\/p>\n<h3>3. Keep the system boundary visible<\/h3>\n<p>This family is supported for <strong>UV<\/strong> en <strong>oplosmiddel<\/strong> systems, not for water-based systems. If the project is really a water-based route, leave this family early and choose a different branch.<\/p>\n<h3>4. Treat storage and handling notes as part of the buying decision<\/h3>\n<p>Longchang\u2019s sealed-storage, light-avoidance, and mix-with-caution notes are part of realistic grade selection, especially when the buyer is narrowing a reactive family for production rather than only for a small lab comparison.<\/p>\n<h3>5. Use the shortest first sample plan that still teaches something<\/h3>\n<p>For many buyers, the cleanest first screen is <strong>2750 or 2780 as the directional grade<\/strong>, then <strong>2760 or 2505 only if the lab needs another viscosity-window option inside that same direction<\/strong>.<\/p>\n<h2>Aanbevolen route naar Longchange vanaf deze pagina<\/h2>\n<ul>\n<li><strong>Reactive family product page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/product\/chlumiag-2750-2760-2780-2505\/\">CHLUMIAG\u00ae 2750 \/ 2760 \/ 2780 \/ 2505<\/a><\/li>\n<li><strong>First-direction comparison page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/2750-vs-2780\/\">CHLUMIAG\u00ae 2750 vs 2780<\/a><\/li>\n<li><strong>Related anti-blocking page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/anti-blocking-additives-coatings-inks\/\">Hoe kies je de juiste antiblokkeermiddelen voor coatings en inkten?<\/a><\/li>\n<li><strong>Related release page:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/release-coating-additive-selection\/\">How to Choose Release Coating Additives for UV Inks and Overprint Varnishes<\/a><\/li>\n<li><strong>Clusteroverzicht:<\/strong> <a href=\"https:\/\/longchangchemical.com\/nl\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae coating- en inktadditieven<\/a><\/li>\n<\/ul>\n<h2>FAQ<\/h2>\n<h3>What is the main difference between CHLUMIAG\u00ae 2750 and 2780?<\/h3>\n<p>The strongest current public difference is application direction. Longchang says 2750 is more suitable for reverse varnish, while 2780 is more commonly used in anti-blocking and anti-graffiti applications.<\/p>\n<h3>When should I choose 2760 instead of 2750?<\/h3>\n<p>Choose 2760 when the 2750-family reactive direction is already right but the team wants a broader mid-range viscosity window. Its current public value is process fit inside the same family, not a separate headline application story.<\/p>\n<h3>When should I choose 2505 instead of 2780?<\/h3>\n<p>Choose 2505 when the reactive family direction is already right and a 4000 to 12000 mPa.s grade window fits the formulation or production plan better. If the real first decision is anti-blocking or anti-graffiti direction, 2780 still moves up first.<\/p>\n<h3>Can this family be used in water-based systems?<\/h3>\n<p>No. The current Longchang family page shows the 2750, 2760, 2780, and 2505 family as applicable for UV and solvent systems, but not for water-based systems.<\/p>\n<h2>Need a tighter grade-selection shortlist?<\/h2>\n<p>If your team already knows it wants the <strong>reactive CHLUMIAG\u00ae 2750 family<\/strong>, stop treating the four grades as if they all solve different chemistry problems. First choose whether the job is <strong>reverse-varnish-led<\/strong> of <strong>anti-blocking or anti-graffiti-led<\/strong>. Then use <strong>2760<\/strong> of <strong>2505<\/strong> as same-family viscosity-window options when the chemistry direction is already correct and the process still needs finer tuning.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical B2B guide to choosing between CHLUMIAG\u00ae 2750, 2760, 2780, and 2505 by separating reverse-varnish fit, anti-blocking or anti-graffiti fit, and same-family viscosity-window selection.<\/p>","protected":false},"author":6,"featured_media":10550,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10549","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>CHLUMIAG\u00ae 2750 vs 2760 vs 2780 vs 2505 for UV Surface 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