Description
DOWSIL 789 Silicone Weatherproofing Sealant is a one-part, neutral-curing silicone sealant specifically designed for general weathersealing in curtain walls and building facades. It cures rapidly upon exposure to atmospheric moisture to produce a durable, flexible silicone rubber joint seal capable of withstanding extreme weather conditions.
Key Features
One-part, gun-grade formulation for easy tooling
Neutral cure: non-corrosive to metals, glass, and masonry
Accommodates ±50% movement in properly designed joints
Excellent unprimed adhesion to porous and non-porous substrates
High resistance to sunlight, UV radiation, rain, and snow
Fast skinning and tack-free cure profile
Remains flexible across temperatures from -50°C to 150°C
Good compatibility with other neutral silicone sealants
Applications
- Weathersealing joints in curtain walling and building facades
- Perimeter sealing around window frames, door openings, and metal panels
- Expansion joints, control joints, and panel joints in precast concrete and masonry
- Sealing aluminium composite panels (ACP) and architectural cladding
Important Notes
- DOWSIL 789 is formulated for weatherproofing and must not be used as a structural glazing adhesive.
- Not intended for use on continuous water immersion joints, underground sealing, or surfaces that bleed oils, plasticizers, or solvents.
Colour & Packing
Colour: Black, Grey, White
Packaging: 500 ml Sausage / 600 ml Sausage (20 pcs/box)
Cartridge: 300 ml Cartridge (24 pcs/box)
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