{"id":10764,"date":"2026-07-20T00:00:36","date_gmt":"2026-07-20T00:00:36","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10764"},"modified":"2026-08-25T08:50:56","modified_gmt":"2026-08-25T08:50:56","slug":"d2645r-vs-d2791-vs-d2792","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/it\/d2645r-vs-d2791-vs-d2792\/","title":{"rendered":"D2645R vs D2791 vs D2792: System & Pigment Guide"},"content":{"rendered":"

D2645R vs D2791 vs D2792 is not a three-way waterborne comparison.<\/strong> DP-D2645R is a DBE-carried, 30%-active solvent-system dispersant. DP-D2791 is a 40\u00b13%-solids, water-carried route for inorganic and organic pigments with pigment-based dose data. DP-D2792 is a 58\u00b13%-solids water\/DPM route that additionally names carbon black but publishes no dosage.<\/p>\n

The old DP-D2791 link is incomplete; the current product page uses agesin-dp-d2791-dispersant<\/code>. Preserve the article URL but correct the product path.<\/p>\n

D2645R\/D2791\/D2792 decision map<\/h2>\n

The decision starts with carrier and pigment: CHLUMICRYL\u00ae DP-D2645R for solvent systems<\/a>, CHLUMICRYL\u00ae DP-D2791 waterborne dispersant<\/a> e CHLUMICRYL\u00ae DP-D2792 for broader waterborne pigment coverage<\/a> are not interchangeable without resin- and pigment-specific evidence.<\/p>\n

\n\n\n\n\n\n\n\n\n
System and pigment<\/th>\nPrimo percorso<\/th>\nApproval gate<\/th>\n<\/tr>\n<\/thead>\n
Solvent or solvent-free epoxy route uses black, organic pigment or matting powder<\/td>\nDP-D2645R<\/td>\nNot waterborne; confirm dose basis and carrier impact<\/td>\n<\/tr>\n
Waterborne TiO2, iron oxide or named organic pigment needs documented pigment-based dose<\/td>\nDP-D2791<\/td>\nCheck resin\/pigment matrix; no public carbon-black route<\/td>\n<\/tr>\n
Waterborne formulation needs broad inorganic\/organic plus carbon-black coverage<\/td>\nDP-D2792<\/td>\nObtain current dosage before a ladder<\/td>\n<\/tr>\n
System or pigment grade is unknown<\/td>\nCharacterize first<\/td>\nNo dispersant ranking<\/td>\n<\/tr>\n<\/tbody>\n<\/table>
Original D2645R\/D2791\/D2792 map: system carrier and pigment-specific evidence precede breadth claims.<\/figcaption><\/figure>\n\n\n\n\n\n\n\n
Prodotto<\/th>\nPublished data<\/th>\nDocumented fit<\/th>\nConfine<\/th>\n<\/tr>\n<\/thead>\n
DP-D2645R<\/strong><\/td>\nBlock copolymer in DBE; 30% active; solvent systems<\/td>\nHigh-pigment carbon black, organic pigment and matting powder; solvent-free epoxy example<\/td>\nNot waterborne; pigment-class dose basis is not labeled<\/td>\n<\/tr>\n
DP-D2791<\/strong><\/td>\nPolar-group copolymer in water; 40\u00b13% solids; VOC\/APEO-free<\/td>\nWaterborne inorganic and organic pigments across acrylic\/PUD\/PUA matrix<\/td>\nNo supported carbon-black entry; dose is explicitly on pigment amount<\/td>\n<\/tr>\n
DP-D2792<\/strong><\/td>\nPolar-group copolymer in water\/DPM; 58\u00b13% solids; APEO-free<\/td>\nWaterborne inorganic pigments, organic pigments and carbon black<\/td>\nNo public recommended dosage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Eliminate the wrong carrier system<\/h2>\n

DP-D2645R uses dibasic ester and its page says solvent-based systems. It should not be ranked inside a waterborne color-paste ladder. If the formulation is waterborne, begin with D2791 or D2792 and keep the DPM contribution from D2792 visible.<\/p>\n

Record resin dispersion, pH, water\/co-solvent, pigment grade, surface treatment, oil absorption or surface area, pigment\/binder ratio and target solids.<\/p>\n

Use DP-D2791 for documented pigment-based guidance<\/h2>\n

D2791 publishes its denominator: addition on pigment amount. Its table gives 10\u201315% for TiO2, 20\u201340% for iron oxides and 30\u201380% for listed organic pigments, with compatibility checks across acrylic, PUD and PUA systems.<\/p>\n

The carbon-black MA-100 row has no supported resin check or dosage. Do not infer a carbon-black recommendation from the broad product description. Test only combinations actually supported or confirmed by current technical data.<\/p>\n

Use DP-D2792 when carbon black is required<\/h2>\n

D2792 explicitly names carbon black together with inorganic and organic pigments and has the highest published solids in this group. However, it supplies no recommended dosage. Request a pigment-grade and resin-specific starting range before grinding.<\/p>\n

Equal supplied percentages are not equal active polymer: D2791 is 40\u00b13% solids and D2792 is 58\u00b13%. Report both supplied and solids-based addition and equalize DPM in the blank when relevant.<\/p>\n

Keep DP-D2645R in the solvent branch<\/h2>\n

D2645R is 30% active in DBE and directly supports high-pigment black, organic pigment and matting powder. Its 1\u201310%, 20\u201340% and 30\u2013100% class ranges do not state the basis; obtain that denominator before calculation.<\/p>\n

The solvent-free epoxy-floor example is application-specific. Validate resin compatibility, cure and VOC\/carrier effects in the actual solvent or solvent-free system.<\/p>\n

Run a pigment-specific grind<\/h2>\n
    \n
  1. Use the exact pigment\/resin combination and additive-free blank.<\/li>\n
  2. Add dispersant to the grind vehicle before pigment.<\/li>\n
  3. Hold equipment, media, fill, speed, energy and temperature.<\/li>\n
  4. Sample fineness, viscosity and color against energy.<\/li>\n
  5. Let down at equal solids, apply, cure and repeat after aging.<\/li>\n<\/ol>\n

    Measure grind and rheology separately<\/h2>\n

    ASTM D1210<\/a> provides a Hegman-type fineness assessment. ASTM D2196<\/a> covers rotational apparent viscosity, shear thinning and thixotropy.<\/p>\n

    Neither alone proves color strength, blackness, gloss, floating\/flooding or storage. Measure those endpoints plus sediment, redispersibility, foam\/density and viscosity drift in mill base and finished product.<\/p>\n

    Interpret color and storage together<\/h2>\n

    Measure color strength and undertone at equal pigment concentration, film thickness and letdown resin. For carbon black, include jetness and undertone; for TiO2, include hiding and tint strength; for organic pigments, include transparency and shade. A lower mill-base viscosity can still produce poorer color development.<\/p>\n

    Age the mill base and finished coating separately. Record clear-layer volume, soft or hard sediment, redispersibility energy, viscosity and color\/gloss drift. D2792\u2019s broader pigment statement does not prove stability with a specific carbon-black surface or waterborne resin, and D2791\u2019s matrix does not replace a real lot test.<\/p>\n

    Check co-solvent and pH compatibility<\/h2>\n

    D2791 is water-carried, while D2792 includes dipropylene glycol methyl ether. Equalize this co-solvent contribution in the blank and monitor pH, resin-particle stability and drying. Recheck after adding the complete binder, coalescent, thickener and other formulation components; a stable color paste can destabilize during letdown.<\/p>\n

    Errori comuni nel confronto<\/h2>\n

    Calling D2645R waterborne<\/h3>\n

    Its current product page explicitly identifies solvent systems.<\/p>\n

    Using D2791 for carbon black<\/h3>\n

    The published carbon-black matrix contains no supported entry.<\/p>\n

    Inventing a D2792 dose<\/h3>\n

    The page gives no recommended addition level.<\/p>\n

    Request a pigment-resin shortlist<\/h2>\n

    Send system, resin, pigment grade and surface data, pH, water\/co-solvent, solids, pigment\/binder ratio, equipment, grind curve, color\/gloss, rheology, foam and storage failure. Ask Longchang Chemical to confirm the D2791 matrix or provide a D2792 pigment-specific dosage<\/strong><\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

    A practical CHLUMICRYL\u00ae buyer guide for waterborne pigment dispersant selection, separating the broadest carbon-black-plus-mixed-pigment route, the titanium-dioxide-and-filler route, and the carbon-black-plus-organic-pigment route.<\/p>","protected":false},"author":6,"featured_media":10765,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nD2645R vs D2791 vs D2792: System & Pigment Guide<\/title>\n<meta name=\"description\" content=\"Compare D2645R, D2791 and D2792 by solvent or water system, pigment matrix, solids, dosage evidence, grind, color, rheology and storage.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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