In skyscrapers where glass panels are bonded directly to the aluminum frame without mechanical clips, Silicone 799 (or its structural-grade equivalent) is the adhesive of choice. It transfers wind loads and dead loads while absorbing thermal expansion of the building.
Features a quick skin-over time of approximately 12 minutes and is tack-free within 18 to 20 minutes.
Offers excellent adhesion to most porous and non-porous materials, including PVC-U, polycarbonate, glass, and aluminum. silicone 799
Unlike acidic silicones, it won't react with or corrode common building materials like sensitive metals, masonry, or brick. High Elasticity:
This tri-layer structure—Substrate/Primer/Silicone—creates a bond interface that is significantly stronger and more durable than the bond formed by sealant alone. In skyscrapers where glass panels are bonded directly
Ideal for sealing glass panels and frames, including polycarbonate and PVC-U. Weathersealing:
| Property | Silicone 799 | Polyurethane (e.g., NP1) | Standard Silicone (DAP) | | :--- | :--- | :--- | :--- | | | ±50% | ±25% | ±20% | | UV Resistance | Excellent | Poor (degrades) | Good (5 years) | | Paintability | No (repels paint) | Yes | No | | Adhesion (no primer) | Glass, metal, concrete | Wood, concrete only | Glass only | | Lifespan | 20+ years | 5-10 years | 10 years | | Cost | High ($$$) | Medium ($) | Low ($) | Offers excellent adhesion to most porous and non-porous
Specifically formulated for use with plastic sheeting like polycarbonate and acrylic. Usage Limitations DOWSIL™ 799 Silicone Glass and Metal Building Sealant