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

Dow DOWSIL 993 Structural Glazing Base Sealant

Dow DOWSIL 993 Structural Glazing Base Sealant is a high-performance, neutral-cure silicone adhesive designed for structural bonding of glass, metal, and stone in curtain wall systems. It offers exceptional UV resistance, weatherability, and adhesion without primers. Meets ASTM C1184 and ISO 11600 standards. Ideal for façade applications requiring long-term durability and movement accommodation up to ±50%.
  • dow dowsil 993 structural glazing base sealant_ae09a6b7
  • dow dowsil 993 structural glazing base sealant_ae09a6b7

Features Of Dow DOWSIL 993 Structural Glazing Base Sealant

  1. High-performance, one-component, moisture-curing silicone sealant engineered specifically for structural glazing applications.

  2. Excellent adhesion to common architectural substrates including anodized aluminum, powder-coated metal, and float glass—without primer in most cases.

  3. Superior UV resistance and long-term weatherability, maintaining elasticity and bond integrity under extreme temperature and humidity cycles.

  4. Non-staining formulation suitable for use with sensitive materials such as marble, limestone, and anodized finishes.

  5. Meets ASTM C1184 and ISO 11600 Class S 25 HM performance requirements for structural silicone glazing sealants.

Typical Applications Of Dow DOWSIL 993 Structural Glazing Base Sealant

  1. Structural bonding of insulating glass units (IGUs) to aluminum curtain wall framing systems.

  2. Weathersealing and structural attachment of vision glass in commercial high-rise façades.

  3. Bonding of spandrel glass panels and ceramic fritted glass to metal substructures.

  4. Secondary structural glazing in unitized curtain wall assemblies requiring high movement capability and durability.

  5. Rebonding and retrofit applications in existing building envelopes where proven silicone performance is required.

Specifications Of Dow DOWSIL 993 Structural Glazing Base Sealant

Chemical TypeAcetoxy-cure silicone polymer
Product FormThixotropic paste, supplied in 310 mL cartridges or 200 L drums
AppearanceOpaque, uniform paste; available in clear, white, and custom colors
Primary ApplicationsStructural glazing, façade bonding, and architectural weathersealing
Key FeaturesPrimerless adhesion, high modulus, excellent movement capability (±25%)
BenefitsReduced labor cost, consistent cure profile, low VOC emissions
Shelf Life12 months from date of manufacture when stored unopened at ≤25°C
Standards ComplianceASTM C1184, ISO 11600 S 25 HM, GB/T 16776


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