Description
DOWSIL 991 HP (High Performance) is a premium, one-part, neutral-cure silicone sealant specially engineered to prevent fluid migration and reduce aesthetic staining on natural stones and sensitive building substrates. Its low-bleed formulation minimizes fluid streaking and dust pick-up on curtain walls and metal facade panels.
Key Features
Non-staining formulation on granite, marble, and limestone
Reduces dirt pick-up and unsightly fluid streaking
Medium modulus accommodating ±50% joint movement
Neutral cure: non-corrosive to sensitive metals and glass
Excellent unprimed adhesion to porous and non-porous surfaces
Exceptional resistance to weathering, UV, and ozone exposure
Smooth tooling and consistent extrusion across all seasons
Long-term elastomeric flexibility without hardening or cracking
Applications
- Weathersealing joints in natural stone cladding (granite, marble, limestone, sandstone)
- Expansion and perimeter joints on aluminium composite panels (ACP) and metal curtain walls
- Aesthetic facade joints where streak-free and non-staining performance is required
- Perimeter sealing around exterior windows, doors, and architectural facades
Important Notes
- DOWSIL 991 HP is dedicated to weathersealing and must not be used as a structural glazing adhesive.
- Substrate compatibility and stain testing should be conducted for sensitive natural stone installations.
- Not recommended for horizontal joints subject to vehicular traffic or continuous submerged conditions.
Colour & Packing
Colour: Black, Grey, White, Bronze, Natural Stone Finishes
Packaging: 600 ml Foil Sausage (20 pcs/box)
Cartridge: 300 ml Cartridge (24 pcs/box)
Download Data Sheet