DOWSIL™ 991 Silicone High Performance Sealant

A medium modulus elastomeric sealant specifically designed for weatherproofing sensitive porous stone and metal panel substrates.

Uses:

Specially formulated to prevent staining of porous substrates such as natural stone and minimize streaking on metal panels and glass.
Forms a durable, flexible, watertight bond with most building materials and can be used for new and remedial construction applications.

Non-staining on natural stone and reduces residue rundown on metal and glass panels
Medium modulus, high movement capability - can accommodate ± 50% movement in a properly designed joint
Good unprimed adhesion to a wide variety of building materials such as natural stone, glass, metal, ceramic tile, fluorocarbon paint finishes and anodized aluminum
Outstanding UV and weathering resistance
Good working time
10-year Limited Weatherseal and Non-Staining Warranties are available
One-part easy to use formulation
Formulated to prevent staining of porous substrates and reduce streaking on glass and metal panels to improve building aesthetic performance
Excellent weathering and durability resulting in longer lifecycle and superior long-term weatherproofing
Excellent unprimed adhesion to most building substrates

These values are not intended for use in preparing specifications.

Adhesion to Yes No Anodized Aluminum, Brickwork, Concrete, Enamelled and Reflective Glass, Fluorocarbon Coated Aluminum, Glass, Granite, Heat Strengthened Glass, Limestone, Low E Coated Glass, Marble, Metal Panels, Polyester Powder Coated Aluminum/Steel, Stainless Steel
Appearance Yes No Opaque, Translucent
Chemistry Yes No Neutral
Color Yes No Black, Bronze, Custom, Grey, Limestone
Cure System Yes No 1-Part Cure
Durometer - Shore A Yes No 24 Shore A
Elongation Yes No 800 %
Flow/Sag (Slump) Yes No < 2.55 mm
Modulus @ 150% Elongation, maximum Yes No 49.3 psi
Movement Yes No Medium
Movement Capability Yes No -50 to 50 %
Number of Parts Yes No One
Resistance Type Yes No Ozone Resistance, Thermal Resistance, UV Resistance, Water Resistance
Shelf Life Yes No 360 Days
Special Features Yes No Non Stain Sealant
Specific Gravity @ 25°C Yes No 1.24
Substrate Yes No Non-porous, Porous
Tack-Free Time-50% RH Yes No 40 Minutes
Tear Strength Yes No 34.27 ppi
Temperature Range Yes No -29 to 50 °C
Tensile Strength Yes No 246 psi
Water Resistant Yes No true
Where Used Yes No Factory, Job Site
Working Time Yes No 20 Minutes

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