DOWSIL™ 791 Silicone Weatherproofing Sealant is a premium, one-part, neutral-cure RTV silicone sealant specifically designed for weathersealing applications in commercial construction. Engineered for maximum flexibility, it accommodates joint movement up to ±50% and delivers long-term adhesion on both porous and non-porous surfaces like glass, aluminum, masonry, and steel. With exceptional weather resistance, including UV, rain, and temperature extremes, this sealant is ideal for use in various climates and building codes.
Product Overview
Cure System : Neutral-cure RTV silicone
Cure Time : Tack-free in approximately 35–45 minutes; full cure in 7–14 days, depending on thickness and environmental conditions
Operating Temperature : -50°C to +150°C (intermittent peaks up to +205°C)
Colors Available : Black, Grey, Dark Grey, Metal Grey, Bronze, Limestone, Precast White, White
Packaging Options : Available in 310 mL cartridges and 600 mL sausages
Certifications : Complies with ASTM C920 Type S, Grade NS, Class 50; ISO 11600 F&G-25LM; EN15651-1/2:2012
Key Features
±50% Movement Capability : Accommodates significant joint movement, ideal for dynamic joints
Excellent Unprimed Adhesion : Adheres well to a variety of substrates, including aluminum, masonry, and coated glass
Outstanding Weather Resistance : Unaffected by UV, ozone, rain, or snow
Non-Sag, Easy-to-Gun Formula : Allows for clean application and tooling
Low VOC Content : VOC content of 31–45 g/L, contributing to green building certifications
Applications
Sealing Curtain Walls : Provides weatherproof seals for curtain wall systems
Glazing Joints : Ideal for sealing joints in glazing applications
Expansion Joints : Accommodates movement in expansion joints on commercial façades and building exteriors
Perimeter Sealing : Seals around windows, doors, and other building envelope penetrations
Safety and Handling
Ventilation : Use in well-ventilated areas to avoid inhalation of vapors released during curing
Skin and Eye Contact : Avoid contact; use appropriate personal protective equipment
Storage : Store in a cool, dry place below 30°C in original sealed containers
Shelf Life : Up to 12 months from the date of manufacture when stored properly
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