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

Dow DOWSIL 503W Wetting Agent

Dow DOWSIL 503W Wetting Agent is a silicone-based surfactant from Dow’s DOWSIL™ portfolio, designed to enhance substrate wetting and leveling in waterborne coatings, inks, and adhesives. It reduces surface tension rapidly, improves pigment dispersion, and delivers excellent compatibility with acrylics and polyurethanes—without foam or residue.
  • dow dowsil 503w wetting agent_c6d054b4
  • dow dowsil 503w wetting agent_c6d054b4

Features Of Dow DOWSIL 503W Wetting Agent

  1. Low-surface-tension silicone-based formulation enabling rapid substrate wetting and spreading on low-energy surfaces.

  2. Excellent compatibility with silicone and organic polymer systems, including RTV, HTV, and addition-cure silicones.

  3. Non-foaming and thermally stable up to 200 °C, supporting high-temperature processing without degradation.

  4. Reduces interfacial tension without compromising cured elastomer mechanical properties or electrical insulation performance.

  5. Halogen-free and RoHS-compliant, supporting environmentally responsible manufacturing requirements.

Typical Applications Of Dow DOWSIL 503W Wetting Agent

  1. Surface treatment for silicone rubber coatings on plastics, metals, and composites in automotive trim and electronics encapsulation.

  2. Wetting aid in liquid silicone rubber (LSR) injection molding for improved mold filling and reduced voids.

  3. Interfacial modifier in silicone pressure-sensitive adhesives (PSAs) to enhance substrate adhesion on polyolefins and PET films.

  4. Processing additive for silicone-based conformal coatings used in printed circuit board (PCB) protection.

Specifications Of Dow DOWSIL 503W Wetting Agent

Chemical TypeLinear polydimethylsiloxane (PDMS) derivative with reactive siloxane end-groups
Product FormClear, low-viscosity liquid
AppearanceColorless to pale yellow, transparent liquid
Primary ApplicationsWetting agent for silicone elastomers, coatings, and adhesives
Key FeaturesLow surface tension (~21 mN/m at 25 °C), non-volatile, hydrolytically stable
BenefitsImproved substrate coverage, reduced pinholes, enhanced interfacial adhesion
Storage ConditionsStore in original sealed container at 5–30 °C; protect from moisture and direct sunlight
Regulatory StatusREACH registered; no SVHCs above threshold; compliant with EU RoHS Directive 2015/863


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