Dow Corning 796 Construction Sealant

Neutral-Cure Silicone Sealant for Windows, Doors & Brickwork

Dow Corning 796 (also known as DOWSIL™ 796) is a one-part, low-modulus, neutral-curing silicone sealant ideal for exterior perimeter sealing. It delivers excellent adhesion to PVC-u, aluminium, wood, glass, and brickwork—making it perfect for weatherproofing window and door frames, glazing joints, and brick-to-frame interfaces.

Key Features & Benefits

• Neutral Cure: Non-corrosive and safe for sensitive materials like sealed glass—no primer needed in many cases.
• Low Modulus & Highly Elastic: Accommodates up to ±25 % joint movement. 
• Excellent Adhesion: Bonds to PVC-u, aluminium, painted surfaces, masonry, and glazed areas—without priming. 
• Fast Skin-Over Time: Forms a skin in approximately 15 minutes and is tack-free in around 35 minutes at 23 °C/50 % RH. 
• Durable & Weather-Resistant: Excellent resistance to UV, ozone, and extreme temperatures.
• Compliant with Standards: Meets ISO 11600 F&G Class 25 LM, and other international specs. 

Typical Technical Properties

• Application Temp: +5 °C to +40 °C (41–104 °F) 
• Specific Gravity: ~1.52 
• Elongation at Break: ~700 % 
• Movement Capability: ±25 % 

Common Applications

• Weather-sealing PVC-u, aluminium, and wood frames
• Sealing around glazing and window perimeters
• Sealing brickwork to frames and other construction substrates

Installation Tips

• Ensure substrates are clean, dry, and free of contaminants.
• Apply a continuous bead, tooling within skin-over time for best adhesion.
• Avoid using on substrates sensitive to alcohols (by-products of cure).