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

Dow DOWSIL 991 Silicone High Performance Sealant

Dow DOWSIL 991 Silicone High Performance Sealant is a premium-grade, acetoxy-cured silicone sealant offering exceptional adhesion to glass, metal, and ceramics. It delivers superior weather resistance, UV stability, and long-term elasticity. Ideal for structural glazing, façade applications, and demanding architectural joints where durability and reliability are critical.
  • dow dowsil 991 silicone high performance sealant_0370ae57
  • dow dowsil 991 silicone high performance sealant_0370ae57

Features Of Dow DOWSIL 991 Silicone High Performance Sealant

  1. Excellent adhesion to common construction substrates including glass, aluminum, anodized metal, and painted surfaces without primer.

  2. Outstanding resistance to weathering, UV radiation, ozone, and extreme temperatures (–40 °C to +150 °C continuous).

  3. High movement capability: ±50% joint movement accommodation per ASTM C719.

  4. Low modulus formulation provides superior stress relief in dynamic joints while maintaining long-term integrity.

  5. Acetoxy cure chemistry enables fast skin-over and deep-section cure under ambient conditions.

Typical Applications Of Dow DOWSIL 991 Silicone High Performance Sealant

  1. Structural and non-structural glazing systems in commercial façades and curtain walls.

  2. Perimeter sealing of insulated glass units (IGUs) and spandrel panels.

  3. Sealing of expansion joints in precast concrete and metal cladding assemblies.

  4. Weatherproofing of window and door perimeters in high-rise and architectural applications.

Specifications Of Dow DOWSIL 991 Silicone High Performance Sealant

Chemical TypeAcetoxy-curing silicone elastomer
Product FormThixotropic paste, single-component
AppearanceOpaque white or translucent gray (color options available)
Primary ApplicationsArchitectural glazing, façade sealing, IGU perimeter bonding
Key FeaturesHigh movement capability, UV stable, primerless adhesion on key substrates
BenefitsReduced labor cost via no-primer application; long service life in exposed environments
Shelf Life12 months in unopened original packaging at ≤25 °C
Standard Packaging300 mL sausage cartridge, 600 mL sausage cartridge


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