Name: Dow DOWSIL FS 91 Defoamer
Brand: Guangzhou Eric Wei Chemical Co., Ltd.

Features Of Dow DOWSIL FS 91 Defoamer

Highly effective silicone-based defoamer for rapid foam knockdown and sustained foam control.
Excellent compatibility with water-based systems, including acrylic, vinyl acetate, and styrene-butadiene emulsions.
Low dosage requirement—typically effective at 0.05–0.3 wt% active in final formulation.
Thermally stable up to 120 °C, supporting high-temperature processing conditions.
Non-yellowing and non-staining, preserving clarity and color integrity in sensitive coatings and adhesives.

Typical Applications Of Dow DOWSIL FS 91 Defoamer

Architectural and industrial waterborne paints and coatings.
Adhesives and sealants, particularly pressure-sensitive and latex-based formulations.
Construction chemicals, including cementitious mortars and tile adhesives.
Textile auxiliaries such as dyeing and finishing baths.
Water treatment systems requiring low-foaming process aids.

Chemical Type	Dimethylpolysiloxane-based emulsion
Product Form	White to off-white aqueous emulsion
Appearance	Opaque, slightly viscous liquid
pH (1% aqueous solution)	6.0–8.0
Specific Gravity (25 °C)	0.98–1.02 g/cm³
Active Content	20–22 wt%
Storage Stability	≥12 months at 5–30 °C in unopened container
Freeze-Thaw Stability	Stable after one cycle (–10 °C for 24 h, then 25 °C for 24 h)

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E-mail: wangxingqiang@ericwchem.com
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