{"id":10553,"date":"2026-07-11T00:00:24","date_gmt":"2026-07-11T00:00:24","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10553"},"modified":"2026-07-11T07:10:05","modified_gmt":"2026-07-11T07:10:05","slug":"pu-leather-additive-selection","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/it\/pu-leather-additive-selection\/","title":{"rendered":"How to Choose Surface Additives for PU Leather and Polyurethane Coatings"},"content":{"rendered":"<p><strong>Risposta rapida:<\/strong> PU leather and polyurethane coating buyers usually lose time when they compare every silicone additive as if it solves the same first problem. <a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a> should move up first when the project is a <strong>two-component polyurethane or hydroxyl-topcoat route<\/strong> and the team mainly wants <strong>leveling, gloss, and smoothness<\/strong> while staying inside a crosslinking system. <a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a> belongs earlier when the buyer needs a <strong>broader polyurethane modification route<\/strong> across <strong>PU coatings, PU leather, and composite coatings<\/strong>, especially when the job also includes <strong>anti-sticking, peeling, smoother hand feel, scratch or abrasion support, low-temperature flexibility, and breathability<\/strong>. <a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumiag-3565\/\">CHLUMIAG\u00ae 3565<\/a> should move up first when the real issue is <strong>PU leather slurry anti-sticking and peeling release<\/strong> with added needs around <strong>wetting, slip, leveling, and compatibility<\/strong>.<\/p>\n<p>That is the commercially useful split. This page is not another generic polyurethane article. It is a buyer-selection page for teams deciding which surface-additive route deserves the first sample round in PU leather and polyurethane coating work.<\/p>\n<h2>Why this page deserves to exist beside the broader CHLUMICRYL\u00ae branch<\/h2>\n<p>Longchange ha gi\u00e0 pagine live per <a href=\"https:\/\/longchangchemical.com\/it\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae Additivi per vernici e inchiostri<\/a>, <a href=\"https:\/\/longchangchemical.com\/it\/leveling-additives-coatings-inks\/\">additivi livellanti<\/a>, <a href=\"https:\/\/longchangchemical.com\/it\/slip-additives-coatings-inks\/\">additivi per la scorrevolezza<\/a>, <a href=\"https:\/\/longchangchemical.com\/it\/anti-blocking-additives-coatings-inks\/\">additivi antibloccanti<\/a>, and the already-live PU-finish comparison page <a href=\"https:\/\/longchangchemical.com\/it\/5005-vs-5005-60-vs-3388\/\">5005 vs 5005-60 vs 3388<\/a>. Those pages help buyers choose broader function lanes or hand-feel versus stain-resistance logic.<\/p>\n<p>PU leather and polyurethane coating teams often hit a different second-stage question after that. They already know the job sits in the <strong>polyurethane surface-control lane<\/strong>. The next decision is narrower: <strong>should the first screen start with a 2K PU topcoat leveling route, a broader PU leather and composite-coating modification route, or a slurry anti-sticking and peeling-release route?<\/strong><\/p>\n<p>That narrower decision is worth its own page because PU systems are rarely judged by one KPI alone. Buyers are often balancing several requirements at once:<\/p>\n<ul>\n<li><strong>leveling, gloss, and film smoothness<\/strong>,<\/li>\n<li><strong>surface hand feel and anti-sticking behavior<\/strong>,<\/li>\n<li><strong>peeling or release behavior in leather-style processing<\/strong>,<\/li>\n<li><strong>scratch and abrasion support after cure<\/strong>e<\/li>\n<li><strong>low-temperature flexibility, breathability, or composite-coating process fit<\/strong>.<\/li>\n<\/ul>\n<p>That is why a polyurethane-specific selection page is more useful than sending every buyer back to a broad function article.<\/p>\n<h2>What the current company-supported facts already separate<\/h2>\n<p>The current Longchang product pages already create a meaningful split:<\/p>\n<ul>\n<li><strong>CHLUMIFE\u00ae 3370<\/strong> is positioned as an <strong>organosilicon feel agent and silicone surfactant<\/strong> per <strong>two-component polyurethane crosslinking systems<\/strong> e <strong>various hydroxyl topcoats<\/strong>. Longchang says it can improve <strong>leveling, gloss, and smoothness<\/strong>. The public page supports use across <strong>UV, solvent, water-based, and baking-finish systems<\/strong>, con un dosaggio raccomandato di <strong>Da 0,1% a 1,0%<\/strong>.<\/li>\n<li><strong>CHLUMIAG\u00ae 3467<\/strong> is positioned as a <strong>silicone leveling agent<\/strong> and a <strong>modified silicone additive<\/strong> used for the comprehensive modification of <strong>polyurethane coatings, PU leather, and composite coatings<\/strong>. Longchang supports it with <strong>leveling, anti-cratering, substrate wetting, anti-sticking and peeling, smooth and pleasant hand feel, scratch resistance, abrasion resistance, low-temperature flexibility, breathability, and moisture permeability<\/strong>. The public page supports <strong>Sistemi a base di raggi UV, solventi e acqua<\/strong>, con un dosaggio raccomandato di <strong>Da 0,1% a 1,0%<\/strong>.<\/li>\n<li><strong>CHLUMIAG\u00ae 3565<\/strong> is positioned as an <strong>organosilicon surfactant<\/strong> utilizzato come <strong>customized anti-sticking and peeling release agent for PU leather slurry<\/strong>. Longchang also supports it with <strong>anti-sticking, peeling, scratch resistance, abrasion resistance, wetting, slip feel, leveling, and compatibility<\/strong>, while stating that it is <strong>compatible with various silicone-modified acrylic resins and polyurethane resins<\/strong>. The public page supports <strong>Sistemi a base di raggi UV, solventi e acqua<\/strong>, gives a recommended dosage of <strong>0.05% to 1.0%<\/strong>, says it should be <strong>added before the curing agent and stirred thoroughly<\/strong>, and explicitly warns that it <strong>pu\u00f2 causare fori di spillo<\/strong>.<\/li>\n<\/ul>\n<p>That difference is enough to justify a dedicated PU leather and polyurethane selection page.<\/p>\n<h2>Tabella comparativa rapida: quale percorso merita di essere visualizzato per primo?<\/h2>\n<table>\n<thead>\n<tr>\n<th>priorit\u00e0 dell&#039;acquirente osservata<\/th>\n<th>Il miglior primo percorso<\/th>\n<th>Perch\u00e9 appartiene al primo posto<\/th>\n<th>Punto di osservazione principale<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Two-component polyurethane or hydroxyl-topcoat project mainly needs better leveling, gloss, and surface smoothness<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a><\/td>\n<td>Longchang directly positions it for two-component polyurethane crosslinking systems and hydroxyl topcoats with leveling, gloss, and smoothness support<\/td>\n<td>Best used when the real first job is topcoat appearance balance rather than anti-sticking or peeling-release correction<\/td>\n<\/tr>\n<tr>\n<td>Broader polyurethane coating, PU leather, or composite-coating project needs multi-property surface modification<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a><\/td>\n<td>Longchang supports a wider bundle around anti-cratering, wetting, anti-sticking, peeling, smooth hand feel, scratch resistance, abrasion resistance, low-temperature flexibility, and breathability<\/td>\n<td>Because the scope is broad, the shortlist still needs a clear first KPI instead of assuming one additive will solve every polyurethane issue at once<\/td>\n<\/tr>\n<tr>\n<td>PU leather slurry needs anti-sticking, peeling release, wetting, and compatibility support<\/td>\n<td><a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumiag-3565\/\">CHLUMIAG\u00ae 3565<\/a><\/td>\n<td>Longchang explicitly frames it as a customized anti-sticking and peeling release agent for PU leather slurry<\/td>\n<td>Add before the curing agent and watch the stated pinhole risk during qualification<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>When CHLUMIFE\u00ae 3370 is the better first move<\/h2>\n<p>3370 should move to the front when the buyer already knows the project is centered on a <strong>two-component polyurethane crosslinking system<\/strong> o un <strong>hydroxyl-topcoat route<\/strong> and wants one additive whose public positioning already matches that process window.<\/p>\n<p>That matters because many polyurethane buyers are not starting with a release or anti-sticking complaint. They are starting with a topcoat that still needs a cleaner balance of <strong>leveling, gloss, and smoothness<\/strong>. Longchang\u2019s public page for 3370 supports exactly that positioning, without forcing the buyer into a broader leather-slurry or composite-modification story too early.<\/p>\n<p>3370 deserves earlier review when:<\/p>\n<ul>\n<li>the project is clearly a <strong>2K polyurethane crosslinking<\/strong> job,<\/li>\n<li>the team wants a route already linked to <strong>hydroxyl topcoats<\/strong>,<\/li>\n<li><strong>gloss and smoothness<\/strong> matter as much as ordinary leveling, or<\/li>\n<li>the buyer wants a cleaner first screen for appearance balance before moving into anti-sticking or scratch-led troubleshooting.<\/li>\n<\/ul>\n<p>The practical limit is page focus. 3370 is strongest when the first problem is topcoat balance and appearance control. If the real bottleneck is leather-slurry release, anti-sticking after contact, or broader multi-property PU modification, the other two routes usually deserve earlier attention.<\/p>\n<h2>When CHLUMIAG\u00ae 3467 is the better first move<\/h2>\n<p>3467 belongs earlier when the buyer needs a <strong>broader polyurethane modification route<\/strong> rather than a narrower 2K-topcoat appearance answer. This is the strongest separation on the current Longchang page. The product is framed for the comprehensive modification of <strong>polyurethane coatings, PU leather, and composite coatings<\/strong>, not only for one topcoat niche.<\/p>\n<p>Longchang also supports an unusually wide set of buyer-relevant effects on the same page: <strong>leveling, anti-cratering, substrate wetting, anti-sticking and peeling, smooth and pleasant hand feel, scratch resistance, abrasion resistance, low-temperature flexibility, breathability, and moisture permeability<\/strong>. That makes 3467 the cleaner first route when the project is not only about how the topcoat looks, but about how the polyurethane surface behaves in use and processing.<\/p>\n<p>3467 deserves earlier review when:<\/p>\n<ul>\n<li>the buyer wants one route that covers <strong>PU coatings, PU leather, and composite coatings<\/strong>,<\/li>\n<li><strong>antiaderente e sbucciante<\/strong> matter together with surface feel,<\/li>\n<li>the line still needs <strong>scratch or abrasion support<\/strong> after cure, or<\/li>\n<li><strong>low-temperature flexibility, breathability, or moisture permeability<\/strong> are part of the downstream requirement set.<\/li>\n<\/ul>\n<p>The caution is not about one explicit page warning as much as scope discipline. Because 3467 can enter several polyurethane conversations at once, buyers should still identify the dominant first-screen job instead of asking one additive to replace structured formulation work.<\/p>\n<h2>When CHLUMIAG\u00ae 3565 is the better first move<\/h2>\n<p>3565 becomes more relevant when the real issue is <strong>PU leather slurry anti-sticking and peeling release<\/strong>. This is its clearest commercial role. Longchang does not frame 3565 mainly as a general 2K topcoat additive. It frames it as a <strong>customized anti-sticking and peeling release agent for PU leather slurry<\/strong>, then adds support around <strong>wetting, slip feel, leveling, and compatibility<\/strong>.<\/p>\n<p>That makes 3565 the stronger first route when:<\/p>\n<ul>\n<li>the process is already inside a <strong>PU leather slurry<\/strong> window,<\/li>\n<li>the buyer needs a more direct <strong>anti-sticking and peeling-release answer<\/strong>,<\/li>\n<li><strong>compatibility with silicone-modified acrylic resins or polyurethane resins<\/strong> matters early, or<\/li>\n<li>the team can manage a stricter <strong>add-before-curing-agent<\/strong> rule during plant or lab trials.<\/li>\n<\/ul>\n<p>The watchpoint is clear and should stay visible. Longchang explicitly warns that 3565 <strong>pu\u00f2 causare fori di spillo<\/strong>. So this is not the lazy default. It is the route to move up when slurry release and anti-sticking logic matter enough to justify tighter defect screening.<\/p>\n<h2>Come gli acquirenti dovrebbero scegliere prima di richiedere i campioni<\/h2>\n<h3>1. Start with whether the first job is topcoat appearance, broader PU modification, or slurry release<\/h3>\n<p>If the first problem is 2K PU or hydroxyl-topcoat leveling with gloss and smoothness, 3370 deserves earlier attention. If the line needs a broader polyurethane surface-performance route, 3467 usually moves up. If the issue is PU leather slurry anti-sticking and peeling release, 3565 belongs first.<\/p>\n<h3>2. Keep the process window visible<\/h3>\n<p>3370 is the clearest route for 2K polyurethane crosslinking and hydroxyl topcoats. 3565 is the clearest route for PU leather slurry handling. 3467 sits between them as the broader polyurethane-modification route across coatings, leather, and composite work.<\/p>\n<h3>3. Separate broad modification from a direct release complaint<\/h3>\n<p>3467 can cover anti-sticking and peeling too, but 3565 becomes more relevant when the complaint is specifically slurry release and anti-sticking in PU leather processing. Those are related but not identical selection jobs.<\/p>\n<h3>4. Do not ignore handling rules and defect watchpoints<\/h3>\n<p>3565 requires add-before-curing-agent discipline and carries a pinhole warning. That should be part of the buying decision, not a late-stage footnote.<\/p>\n<h3>5. Keep the first lab round short<\/h3>\n<p>For many polyurethane buyers, the cleanest first round is one <strong>3370-led 2K topcoat route<\/strong>, uno <strong>3467-led broader PU modification route<\/strong>e uno <strong>3565-led slurry anti-sticking and release route<\/strong>. That usually teaches more than screening too many nearby silicone additives at once.<\/p>\n<h2>Percorso consigliato per Longchange da questa pagina<\/h2>\n<ul>\n<li><strong>2K PU and hydroxyl-topcoat route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumife-3370\/\">CHLUMIFE\u00ae 3370<\/a><\/li>\n<li><strong>Broader PU coating and composite-coating route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumiag3467-silicone-leveling-agents\/\">CHLUMIAG\u00ae 3467<\/a><\/li>\n<li><strong>PU leather slurry anti-sticking route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/it\/product\/chlumiag-3565\/\">CHLUMIAG\u00ae 3565<\/a><\/li>\n<li><strong>Panoramica del cluster:<\/strong> <a href=\"https:\/\/longchangchemical.com\/it\/chlumicryl-coating-ink-additives\/\">CHLUMICRYL\u00ae Additivi per vernici e inchiostri<\/a><\/li>\n<li><strong>Pagina relativa alla funzione:<\/strong> <a href=\"https:\/\/longchangchemical.com\/it\/leveling-additives-coatings-inks\/\">Come scegliere gli additivi livellanti per rivestimenti e inchiostri<\/a><\/li>\n<li><strong>Pagina relativa alla funzione:<\/strong> <a href=\"https:\/\/longchangchemical.com\/it\/anti-blocking-additives-coatings-inks\/\">Come scegliere gli additivi antibloccanti per rivestimenti e inchiostri<\/a><\/li>\n<li><strong>Related polyurethane-finish comparison:<\/strong> <a href=\"https:\/\/longchangchemical.com\/it\/5005-vs-5005-60-vs-3388\/\">5005 vs 5005-60 vs 3388 for PU Leather Hand Feel and Stain Resistance<\/a><\/li>\n<\/ul>\n<h2>FAQ<\/h2>\n<h3>Which additive should I screen first for two-component polyurethane topcoats?<\/h3>\n<p>If the project is clearly a two-component polyurethane crosslinking or hydroxyl-topcoat job and the first need is leveling, gloss, and smoothness, 3370 deserves earlier review because Longchang directly positions it for that route.<\/p>\n<h3>When is 3467 a better first route than 3370?<\/h3>\n<p>3467 is a better first route when the buyer needs a broader polyurethane-modification package across PU coatings, PU leather, or composite coatings, especially when anti-sticking, peeling, hand feel, scratch resistance, flexibility, or breathability also matter.<\/p>\n<h3>When should 3565 move ahead of 3467?<\/h3>\n<p>3565 should move ahead when the real problem is PU leather slurry anti-sticking and peeling release, and the team can manage the add-before-curing-agent rule plus the stated pinhole-risk watchpoint.<\/p>\n<h3>Are these three products interchangeable?<\/h3>\n<p>No. Their public company-supported positioning is different enough that buyers should not treat them as drop-in substitutes. One leads with 2K PU topcoat leveling, one with broader polyurethane-surface modification, and one with PU leather slurry anti-sticking and release logic.<\/p>\n<h2>Need a tighter polyurethane shortlist?<\/h2>\n<p>If your polyurethane or PU leather project is stuck between better topcoat appearance, broader surface performance, and cleaner slurry anti-sticking or peeling release, start by deciding whether the real first job is <strong>2K topcoat leveling<\/strong>, <strong>broader PU modification<\/strong>, O <strong>slurry release and anti-sticking<\/strong>. That usually shows much faster whether 3370, 3467, or 3565 deserves the first sample round.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical B2B selection guide for PU leather and polyurethane coating teams comparing CHLUMIFE\u00ae 3370, CHLUMIAG\u00ae 3467, and CHLUMIAG\u00ae 3565 for 2K PU leveling, smooth hand feel, anti-sticking, peeling release, scratch resistance, low-temperature flexibility, and composite-coating fit.<\/p>","protected":false},"author":6,"featured_media":10554,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10553","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>PU Leather Additive Selection: 3370 vs 3467 vs 3565<\/title>\n<meta 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