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

DOW DOWSIL 903H Additive

DOW DOWSIL 903H 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 while maintaining low VOC and excellent compatibility with diverse resin systems.
  • dow dowsil 903h additive_6b0ce2eb
  • dow dowsil 903h additive_6b0ce2eb

Features Of DOW DOWSIL 903H Additive

  1. Enhances adhesion to low-surface-energy substrates including polyolefins and fluoropolymers.

  2. Improves crosslink density and thermal stability in silicone-based sealants and adhesives.

  3. Offers excellent compatibility with addition-cure liquid silicone rubber (LSR) formulations.

  4. Enables faster cure kinetics without compromising pot life or processing window.

  5. Provides consistent performance across varying humidity and temperature conditions.

Typical Applications Of DOW DOWSIL 903H Additive

  1. Automotive under-hood sealing compounds requiring high-temperature resistance.

  2. Electronics encapsulation and potting where substrate adhesion and reliability are critical.

  3. Medical-grade silicone assemblies requiring biocompatibility-supporting formulation flexibility.

  4. Industrial gasketing and bonding of dissimilar materials (e.g., silicone-to-plastic or silicone-to-metal).

  5. Consumer appliance seals exposed to repeated thermal cycling and environmental stress.

Specifications Of DOW DOWSIL 903H Additive

Chemical TypePlatinum-based hydrosilylation catalyst additive
Product FormLiquid
AppearanceClear, colorless to pale yellow liquid
Primary ApplicationsAdhesion promotion and cure enhancement in silicone elastomers and sealants
Key FeaturesSubstrate adhesion booster, cure accelerator, LSR compatibility enhancer
BenefitsReduced scrap rates, improved bond durability, extended formulation latitude
Storage ConditionsStore at 5–25°C; protect from moisture and direct sunlight
Shelf Life12 months from date of manufacture when stored properly


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