{"id":10512,"date":"2026-07-09T00:00:06","date_gmt":"2026-07-09T00:00:06","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10512"},"modified":"2026-08-08T08:38:31","modified_gmt":"2026-08-08T08:38:31","slug":"d980-vs-d9904br-vs-d912r","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/d980-vs-d9904br-vs-d912r\/","title":{"rendered":"D980 vs D9904BR vs D912R: Defoamer Selection Guide"},"content":{"rendered":"

D980 vs D9904BR vs D912R is primarily a system-and-incorporation decision.<\/strong> DF-D980 is a highly active solvent\/UV grind-stage defoamer that is prohibited in varnish. DF-D9904BR is a water-based, high-shear grind-stage defoamer. DF-D912R is a low-active solvent defoamer with better varnish compatibility and anti-cratering support. None is a universal late post-addition rescue.<\/p>\n

First prove that the defect is air or foam. Craters can come from contamination or incompatibility; pinholes can come from dewetting, porous-substrate outgassing, solvent\/water boil, excessive film build, or cure skinning. A correctly selected defoamer can still fail if added at the wrong stage.<\/p>\n

D980 vs D9904BR vs D912R decision map<\/h2>\n
\n\n\n\n\n\n\n\n\n
System\/evidence<\/th>\nFirst route<\/th>\nReason<\/th>\n<\/tr>\n<\/thead>\n
Solvent or UV pigmented system; strong grind-stage foam; not a varnish<\/td>\nD980<\/td>\n\u226595% solids, hydrophobic particles, 0.2\u20131.0%, grind addition<\/td>\n<\/tr>\n
Water-based system; microfoam\/pinholes follow high-shear manufacture<\/td>\nD9904BR<\/td>\n30% active, silica-free, 0.1\u20131.0%, co-solvent\/high-shear abrasive stage<\/td>\n<\/tr>\n
Solvent system; varnish compatibility and anti-cratering matter; grind exists<\/td>\nD912R<\/td>\n2% active, 0.1\u20130.25%, varnish-compatible solvent route<\/td>\n<\/tr>\n
Defect worsens with substrate temperature, porosity, heavy film, short flash, or cure ramp<\/td>\nProcess diagnosis<\/td>\nOutgassing\/boil\/skin formation may not be foam generated in the batch<\/td>\n<\/tr>\n<\/tbody>\n<\/table>
Original defoamer system map: select water versus solvent\/UV, then varnish fit, concentration, and documented grind-stage incorporation.<\/figcaption><\/figure>\n\n\n\n\n\n\n\n
Produto<\/th>\nComposition\/concentration<\/th>\nPublished use<\/th>\nBoundary<\/th>\n<\/tr>\n<\/thead>\n
CHLUMICRYL\u00ae DF-D980<\/strong><\/a><\/td>\nPolysiloxane with hydrophobic particles; \u226595% solids<\/td>\nSolvent\/UV; 0.2\u20131.0%; add to abrasive\/grind<\/td>\nNot applicable to varnish; remix precipitate; diluted solution storage only 1\u20132 days<\/td>\n<\/tr>\n
CHLUMICRYL\u00ae DF-D9904BR<\/strong><\/a><\/td>\nPolyether-modified polysiloxane, silica-free; 30% active in DPM<\/td>\nWater-based; 0.1\u20131.0%; combine with co-solvent then high-shear abrasive\/grind<\/td>\nNot recommended as late post-addition; cold stratification\/turbidity requires warming and mixing<\/td>\n<\/tr>\n
CHLUMICRYL\u00ae DF-D912R<\/strong><\/a><\/td>\nFluorocarbon-modified polysiloxane in isobutyl adipate; 2% active<\/td>\nSolvent; 0.1\u20130.25%; add to abrasive\/grind<\/td>\nBetter varnish compatibility does not create a post-addition instruction<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Choose D980 for strong solvent\/UV grind-stage foam<\/h2>\n

D980 is the concentrated route for solvent or UV pigmented systems. Its hydrophobic particles may precipitate during storage, so remix before use. If diluted with solvent, the public page limits the diluted solution to 1\u20132 days. Add it to the abrasive\/grind, not after foam appears in finished material.<\/p>\n

D980 is explicitly not applicable to varnish. Protect transparency, gloss, haze, craters, adhesion, cure, storage, and filterability. Its high concentration also means equal product percentages are not a fair comparison with 2%-active D912R.<\/p>\n

Choose D9904BR for water-based high-shear microfoam<\/h2>\n

D9904BR is the only water-based route in this comparison. The page recommends adding it to co-solvent first and then dispersing it with the abrasive under high-speed stirring. A late addition to a completed waterborne batch is not equivalent.<\/p>\n

Track foam generation\/decay, density, wet-film bubbles, cured pinholes, craters, gloss, adhesion, and storage. If stored below 5\u00b0C it may stratify or become turbid; warm and mix as directed, then requalify before precision use.<\/p>\n

Choose D912R when solvent varnish compatibility matters<\/h2>\n

D912R is a solvent-only, 2%-active product whose page highlights varnish compatibility, defoaming, surface-tension reduction, and anti-cratering. The published range is 0.1\u20130.25% total formulation.<\/p>\n

Despite its varnish positioning, the page still instructs addition to the abrasive. If a clear varnish has no abrasive\/grind stage, obtain a current supplier-approved incorporation method rather than assuming late post-addition. Evaluate gloss, clarity, craters, recoat, and cure with foam control.<\/p>\n

Normalize active content before interpreting dosage<\/h2>\n

The products have very different concentrations: D980 is at least 95% solids, D9904BR is 30% active, and D912R is 2% active. Do not compare them at equal product weight and infer strength. They are formulated for different systems and compatibility profiles.<\/p>\n

Use supplier-supported product dosage, then record both as-supplied percentage and approximate active contribution. The active calculation is descriptive\u2014not permission to substitute one chemistry or cross a water\/solvent\/varnish boundary.<\/p>\n

Build a mechanism-controlled foam trial<\/h2>\n
    \n
  1. Reproduce generation.<\/strong> Fix batch size, vessel, blade, shear, time, temperature, and fill level.<\/li>\n
  2. Fix incorporation.<\/strong> Follow each product’s documented premix and grind stage.<\/li>\n
  3. Measure wet behavior.<\/strong> Record foam height\/decay, density, microbubble count, and viscosity.<\/li>\n
  4. Apply controlled films.<\/strong> Hold substrate, film build, flash, cure, temperature, and humidity.<\/li>\n
  5. Inspect guardrails.<\/strong> Count pinholes\/craters and measure gloss, haze, adhesion, cure, and storage.<\/li>\n<\/ol>\n

    Separate foam from dewetting and outgassing<\/h2>\n

    If circular defects map to substrate contamination, first run cleaning and wetting controls. If they worsen with porous or hot substrate, heavy film, short flash, or aggressive oven\/UV conditions, change those variables before escalating defoamer. Record when the defect appears: mixing, application, flash, cure, or cooling.<\/p>\n

    A defoamer cannot reliably stop gas generated under a film that skins too early, and a wetting additive cannot release air retained by high-shear manufacture.<\/p>\n

    Use film measurements with foam data<\/h2>\n

    ASTM D823<\/a> describes methods for producing uniform coating films on test panels. ASTM D523<\/a> covers specular gloss, while ASTM D3359<\/a> covers tape adhesion on suitable metallic substrates and explains interpretation limits.<\/p>\n

    Report foam generation\/decay, wet-film bubbles, cured pinholes\/craters, film thickness, gloss, haze, color, adhesion, cure, recoat, water\/chemical resistance, and storage. A clear liquid with low foam but more craters or adhesion loss is not a passing defoamer.<\/p>\n

    Common comparison errors<\/h2>\n

    Using D980 in varnish<\/h3>\n

    The prohibition is explicit. Choose a documented varnish-compatible route such as D912R and still confirm incorporation, clarity, gloss, and recoat.<\/p>\n

    Post-adding D9904BR<\/h3>\n

    The page requires co-solvent and high-shear abrasive\/grind incorporation and says it is not recommended for later addition.<\/p>\n

    Equating equal product dose with equal chemistry<\/h3>\n

    Concentration differs from 2% to at least 95%, and the carrier\/system fit differs. Compare within each product\u2019s documented range and purpose.<\/p>\n

    Request a D980\/D9904BR\/D912R shortlist<\/h2>\n

    Send the water\/solvent\/UV system, varnish or pigmented status, resin\/solvent, pigments\/fillers, current additives, grind and letdown sequence, shear, foam source, application, film build, flash\/cure, defect timing, and clarity\/gloss\/recoat requirements. Ask Longchang Chemical to compare D980, D9904BR, or D912R<\/strong><\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

    A practical B2B defoamer comparison for coatings and inks buyers choosing between DF-D980, DF-D9904BR, and D912R by system boundary, varnish compatibility, microbubble control, addition method, and anti-cratering risk.<\/p>","protected":false},"author":6,"featured_media":10513,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10512","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nD980 vs D9904BR vs D912R: Defoamer Selection Guide<\/title>\n<meta name=\"description\" content=\"Compare D980, D9904BR and D912R by solvent\/UV\/water system, varnish fit, active content, dosage and grind-stage incorporation before foam trials.\" \/>\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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