{"id":10857,"date":"2026-07-25T00:00:03","date_gmt":"2026-07-25T00:00:03","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10857"},"modified":"2026-08-09T06:17:45","modified_gmt":"2026-08-09T06:17:45","slug":"uv-screen-varnish-additives","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/id\/uv-screen-varnish-additives\/","title":{"rendered":"UV Screen Varnish Additives: Leveling, Foam & Cure"},"content":{"rendered":"

UV screen varnish additives should be selected after the defect is named.<\/strong> A thick screen-applied varnish can fail through poor leveling, trapped air, incomplete UV conversion, weak adhesion, excessive slip, rub loss or blocking. One silicone additive is not a cure for all seven.<\/p>\n

The most defensible first routes are CHLUMIAG\u00ae 3500 for a documented acrylic-functional radiation-cure leveling route, CHLUMILE\u00ae 3432 for general cross-system leveling, and CHLUMIAF\u00ae 3062 only when foam or entrained air has been measured. The public 2750 family page does not support the previous reactive or reverse-varnish assignment.<\/p>\n

UV screen varnish decision map<\/h2>\n
\n\n\n\n\n\n\n\n\n
Observed failure<\/th>\nFirst evidence check<\/th>\nRoute to screen<\/th>\n<\/tr>\n<\/thead>\n
Orange peel, poor flow or uneven gloss without bubbles<\/td>\nHold mesh, wet film, rheology and UV dose constant<\/td>\n3500 or 3432<\/td>\n<\/tr>\n
Wet bubbles become cured pinholes<\/td>\nTrack air after mixing, flood stroke, print stroke and dwell<\/td>\n3062<\/td>\n<\/tr>\n
Tacky surface, weak solvent resistance or blocking<\/td>\nMeasure lamp output, line speed, film build and through-cure<\/td>\nFix cure before additive escalation<\/td>\n<\/tr>\n
Adhesion or overprint fails after surface improvement<\/td>\nLocate substrate\/coating or intercoat failure<\/td>\nReduce surface modification and retest<\/td>\n<\/tr>\n<\/tbody>\n<\/table>
Original UV screen-varnish map: separate leveling, process air and cure before changing the surface package.<\/figcaption><\/figure>\n\n\n\n\n\n\n\n
Produk<\/th>\nPublished fit<\/th>\nSupplier guidance<\/th>\nBatas<\/th>\n<\/tr>\n<\/thead>\n
CHLUMIAG\u00ae 3500<\/strong><\/a><\/td>\nAcrylic-functional radiation-cure leveling; UV, solvent and water-based systems<\/td>\n0.05\u20131%; any stage or later; alkane\/aromatic dilution<\/td>\nProtect from light\/heat; avoid additive mixtures; confirm UV conversion<\/td>\n<\/tr>\n
CHLUMILE\u00ae 3432<\/strong><\/a><\/td>\nPolyether-modified polysiloxane leveling route; UV, solvent and water-based<\/td>\n0.05\u20131%; any stage; water\/alcohol\/alkane\/aromatic dilution<\/td>\nNot documented as a reactive network-building route; avoid mixing<\/td>\n<\/tr>\n
CHLUMIAF\u00ae 3062<\/strong><\/a><\/td>\n100% active nonionic silicone defoamer; UV, solvent and water-based<\/td>\nPrinting inks 0.1\u20130.5% total formulation<\/td>\nUse only for measured air; solvent dilution needs stability and defoaming tests<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Use 3500 for the documented reactive UV route<\/h2>\n

The 3500 product page states that it contains reactive acrylic functional groups and can crosslink into the polymer network in radiation-curing systems. That supports a reactive UV screen, but not an assumption of complete conversion in every oligomer, monomer, photoinitiator, pigment or lamp combination.<\/p>\n

Run a low-to-high 0.05\u20131% ladder while holding UV dose, peak irradiance, spectrum, line speed and wet film constant. Record surface and through-cure, gloss, leveling, slip, adhesion, rub, blocking and recoat. A smoother surface is not proof of cure.<\/p>\n

Use 3432 for general leveling evidence<\/h2>\n

3432 is a cross-system leveling and wetting route with the same published 0.05\u20131% range. It can be useful when the decision is surface balance rather than reactive incorporation. Compare it alone against the blank and 3500; the public page advises avoiding mixtures with other additives.<\/p>\n

Check crater suppression, print definition, edge hold, gloss uniformity, slip, adhesion and subsequent decoration. Excess surface activity can improve appearance yet weaken intercoat acceptance or alter blocking.<\/p>\n

Use 3062 only when air is demonstrated<\/h2>\n

3062 is a defoamer, not a general cure or leveling additive. Standardize mixing, ink return, screen flood, squeegee speed, dwell and substrate temperature. Compare wet-film bubbles with cured pinholes so dewetting is not mistaken for foam.<\/p>\n

If solvent dilution is used, follow the product-page instruction to test storage stability and defoaming performance first. Select the lowest level that controls air without causing craters, haze, gloss loss, adhesion loss or poor recoat.<\/p>\n

Why 2750 leaves the first shortlist<\/h2>\n

The current shared 2750\/2760\/2780\/2505 page describes multi-component modified polydimethylsiloxane, UV\/solvent compatibility, 0.1\u20133% and variant viscosities. It does not document acrylic reactive groups, network crosslinking, or a 2750-specific reverse-varnish function. Those claims require a current individual TDS and supplier confirmation.<\/p>\n

Build a controlled screen-varnish trial<\/h2>\n
    \n
  1. Fix the print process.<\/strong> Hold mesh, emulsion, squeegee, stroke, wet film and dwell.<\/li>\n
  2. Fix the UV process.<\/strong> Record lamp type, age, spectrum, dose, irradiance, line speed and cooling.<\/li>\n
  3. Use one additive at a time.<\/strong> Run blank plus a compact ladder.<\/li>\n
  4. Condition before judging.<\/strong> Use the same post-cure time, temperature and humidity.<\/li>\n
  5. Challenge downstream work.<\/strong> Include rub, stack\/block, adhesion, foil, overprint or die-cut needs.<\/li>\n<\/ol>\n

    Measure cure and print performance separately<\/h2>\n

    ASTM D5402<\/a> uses solvent rubs to assess solvent resistance of chemically changing coatings, but explicitly warns that solvent resistance alone does not prove full cure. ASTM D5264<\/a> compares abrasion resistance of printed materials under controlled laboratory conditions. ASTM D3359<\/a> is a limited tape-adhesion rating method and must be matched to substrate and film thickness.<\/p>\n

    Report UV measurements, wet\/dry film, tack, solvent rub, gloss, haze, rub loss, adhesion failure mode, COF, stack temperature\/pressure, odor and downstream converting. Use production substrate and ink beneath the varnish.<\/p>\n

    Common selection errors<\/h2>\n

    Calling every pinhole a foam defect<\/h3>\n

    Track the defect from wet mixing through cure. Air, dewetting, substrate outgassing and incomplete cure require different corrections.<\/p>\n

    Calling 2750 reactive without product-specific evidence<\/h3>\n

    The public family page does not substantiate the former reactive or reverse-varnish positioning for 2750.<\/p>\n

    Approving gloss before cure<\/h3>\n

    Appearance can pass while through-cure, rub, adhesion or blocking fails. Keep those gates separate.<\/p>\n

    Request a UV screen-varnish shortlist<\/h2>\n

    Send the varnish oligomer\/monomer, photoinitiator, pigment or matting, current additives, substrate and underlying ink, mesh, film build, UV equipment, line speed, defect photos, and cure, adhesion, rub, slip, blocking and converting limits. Ask Longchang Chemical to compare 3500, 3432 or 3062<\/strong><\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

    A practical CHLUMICRYL\u00ae buyer guide for UV screen varnishes that separates reactive cured-surface control, print-face leveling and crater balance, and trapped-air cleanup in thick-film screen-varnish work.<\/p>","protected":false},"author":6,"featured_media":10858,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10857","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nUV Screen Varnish Additives: Leveling, Foam & Cure<\/title>\n<meta name=\"description\" content=\"Choose UV screen varnish additives for reactive leveling, general surface control or verified foam. 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