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DOWSIL 791 Silicone Weatherproofing Sealant
Description

Part of the Architectural Building Series, DOWSIL™ 791 Silicone Weatherproofing Sealant is a specified premium performance weathersealing product, specifically designed for general glazing and in curtain wall and building facades.

Produced in compliance with the internationally recognised PAS 2060 verified carbon neutrality standard, DOW Carbon-Neutral Silicones for Building Façades can support green-building design initiatives, enhance façade sustainability, and improve green-building ratings across the construction industry.

Available in black, grey, and white.

Key Features
  • Neutral cure
  • Excellent unprimed adhesion to a wide range of construction materials
  • Joint movement capability of (+/-50%)
  • Compatible with all DOW structural sealants
  • Excellent weatherability, virtually unaffected by sunlight, rain, snow, ozone or temperature extremes
  • Ease of application
  • Sustainability: Low embodied carbon DOWSIL™ Silicone
  • Project specific DOW Carbon Neutrality Certificate on request
  • Externally verified carbon neutrality according to PAS 2060
Scope of Use
  • Ideal for expansion, construction, perimeter and other joints
  • Suitable for use on coated glass, galvanised steel, copper, masonry and other porous substrates
Limitations on Use
  • Must be used in accordance with technical literature and maintenance guidelines
  • DOWSIL™ 791 Silicone Weather-proofing Sealant is not approved for use as a structural sealant
  • Some applications may require the use of a specific DOWSIL primer
  • For more information on compatibility with other products and specialist advice, please contact Glasscorp Architectural directly
  • Customers should independently determine the suitability of this product for their specific purpose prior to use
Statement of Building Code Compliance

DOWSIL™ sealants may contribute to compliance with the following code clauses when correctly applied.

  • B2 (Durability), B2.3.1(a). The durability of silicone is well established in NZ based on in-service use.
  • C2 – C6 (Protection from Fire), applicable performance criteria. Performance based on fire testing.
  • E2 (External Moisture) & E3 (Internal Moisture), applicable performance criteria. Silicone when applied seals joints and allowed to cure will resist water penetration.
  • F2 (Hazardous Building Materials), F2.3.1. Silicone is not considered hazardous, and does not emit harmful gases. 
In-Service History

DOWSIL™ 791 has been used extensively worldwide and in New Zealand for decades as a trusted commercial facade weather-seal product.

Other Performance Attributes
  • Sustainability: Low embodied carbon DOWSIL™ Silicone
  • Project specific DOW Carbon Neutrality Certificate on request
  • Externally verified carbon neutrality according to PAS 2060
  • Joint movement capability of (+/-50%)

Warranty & Maintenance

  • 15 year manufacturer warranty and 5 year installer/applicator warranty for DOWSIL™ sealants.
  • Follow DOW Silicone Sealant Maintenance Guidelines
Documents
BPIR Product Statement: DOWSIL Silicone Sealants

v.1.0

Material Safety Data Sheet: DOWSIL 791

2025

Technical Data Sheet: DOWSIL 791

2025

LEED Letter: DOWSIL 791

2025

Glasscorp on Masterspec
Masterspec Work Section: DOW Sealants
Maintenance Guidelines: DOW Silicone Sealants
Sealant Usage Calculations

2024

Glasscorp Architectural are glass and sealant specialists supporting architects in their design of cutting-edge, high-performance buildings.

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