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

Dow DOWSIL 33 Additive

Dow DOWSIL 33 Additive is a silicone-based rheology modifier from Dow’s DOWSIL™ portfolio, designed to enhance flow, leveling, and anti-sag performance in coatings, adhesives, and sealants without compromising cure speed or clarity.
  • dow dowsil 33 additive_ee1032dc
  • dow dowsil 33 additive_ee1032dc

Features Of Dow DOWSIL 33 Additive

  1. Enhances flow and leveling in silicone-based coatings and sealants.

  2. Improves substrate wetting on low-energy surfaces including plastics and fluoropolymers.

  3. Reduces surface tension without compromising thermal or chemical stability.

  4. Compatible with addition-cure and condensation-cure silicone systems.

  5. Non-volatile and non-reactive—functions as a processing aid, not a crosslinker.

Typical Applications Of Dow DOWSIL 33 Additive

  1. Automotive silicone gasketing compounds.

  2. Electronics encapsulants and potting formulations.

  3. Architectural glazing sealants for structural silicone bonding.

  4. Medical-grade liquid silicone rubber (LSR) processing aids.

  5. Industrial release coatings for high-temperature molds.

Specifications Of Dow DOWSIL 33 Additive

Chemical TypeOrganomodified siloxane
Product FormClear, low-viscosity liquid
AppearanceColorless to pale yellow, transparent
Density (25 °C)0.94–0.96 g/cm³
Refractive Index (25 °C)1.40–1.42
Volatile Content (150 °C, 3 h)<1.0 wt%
Flash Point (PMCC)>150 °C
Storage StabilityStable for 24 months in unopened original container at 5–30 °C


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