Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

DOW DOWSIL 904H Defoamer

DOW DOWSIL 904H is a high-performance silicone coating additive with advanced thermo-mechanical attributes. The colorless transparent liquid (1,200-2,500 mPa·s) stays stable at pH 5-10 and ≤80°C, boosting leveling by 40% at 0.5%-3% dosage. ISO 9001/REACH-certified, it lessens orange peel defects and improves abrasion resistance (25% lower Taber wear index) in waterborne, solvent-based, and powder coatings.

Product Information of DOW DOWSIL 904H Defoamer

  1. Dynamic Leveling Ability: Nano-silicone particles remove brush/roller marks through surface tension gradient control.

  2. Enhanced Scratch Resistance: Raises pencil hardness by 2 grades (per ASTM D3363).

  3. Strong Chemical Stability: Withstands 72-hour immersion in 5% NaOH/10% HCl without discoloration.

  4. Eco-Friendly Compliance: APEO/VOC-free, meeting GB 18582-2020 standards.

  5. Excellent UV Durability: Maintains 90% gloss after 1,000-hour QUV-A aging.

Areas of Application of DOW DOWSIL 904H Defoamer

  1. Architectural Coatings: Improves latex paint flow for 30% quicker application.

  2. Industrial Coatings: Prolongs epoxy floor coating service life by 50%.

  3. Automotive Clearcoats: Reduces microfoam in waterborne varnishes and enhances gloss by 15%.

  4. Powder Coatings: Achieves Ra≤0.3 μm surface smoothness in polyester/TGIC systems.

  5. Wood Coatings: Cuts pinhole defects by 60% in UV-cured finishes.

Specifications Of DOW DOWSIL 904H Defoamer

Type
Silicone coating additive
Appearance
Colorless transparent liquid
Active Content
Polyether-modified polydimethylsiloxane (80-85%)
Dynamic Viscosity
1,200-2,500 mPa·s
pH Range
5-10
Density
1.01-1.05 g/cm³
Surface Tension
21.5 dyn/cm
Flash Point
>100°C (closed cup)
Thermal Stability
No stratification (80°C/24h)
Recommended Dosage
0.5%-3% (by total weight)
Shelf Life
24 months (sealed, 5-40°C)
Packaging
20kg/plastic drum or 200kg/steel drum


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