Description
DOWSIL 789P is a premium, one-part, neutral-curing silicone sealant engineered specifically for weatherproofing joints in curtain walls, panel facades, and external building envelopes. It cures on exposure to atmospheric moisture to form a resilient, flexible silicone rubber seal that delivers outstanding weatherability, durability, and adhesion in challenging exterior climates.
Key Features
One-component, gun-grade formulation with smooth tooling
Accommodates ±25% to ±50% joint movement capability
Neutral cure: non-corrosive to sensitive metals and glass coatings
Excellent adhesion without primer to common construction substrates
Outstanding resistance to weathering, UV rays, ozone, and temperature extremes
Consistent extrusion and tooling across broad temperature spans
Maintains long-term elasticity without hardening or cracking
Compatible with architectural finishes and neutral silicone systems
Applications
- Weathersealing dynamic expansion and control joints on building facades
- Perimeter sealing around window systems, storefronts, and curtain walls
- Sealing aluminium composite panels (ACP), metal panels, and stone cladding
- External joints between concrete, brick, stone, and metal substrates
Important Notes
- DOWSIL 789P is designed strictly for weathersealing applications and is not intended for use as a structural glazing adhesive.
- Not recommended for horizontal decks subject to vehicular traffic, continuous immersion in water, 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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