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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.

Benefits:

  • 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

Properties

These values are not intended for use in preparing specifications.

Typical Properties

  • 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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Please Contact Dow for additional information.

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DOWSIL™ 991 Silicone High Performance Sealant
No Technical Data Sheets are available online for this material.
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DOWSIL™ 991 Silicone High Performance Sealant
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