DOWSIL™ 790 Silicone Building Sealant – Ultra-Low Modulus Weatherseal

Dow Chemicial

DC790-10-30ZWH

Sale price $26.95 Regular price $29.04

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DOWSIL™ 790 Silicone Building Sealant – High-Movement Weatherseal

DOWSIL™ 790 Silicone Building Sealant is a one-part, ultra-low-modulus, neutral-curing silicone elastomer designed for high-movement weathersealing applications. This durable sealant offers excellent primerless adhesion to porous substrates such as concrete, natural stone, and masonry, making it ideal for demanding construction projects. Available in a variety of colors, it provides exceptional weather resistance and long-lasting performance.

Key Features and Benefits

  • Ultra-Low-Modulus: Allows for extension/compression joint movement of +100/-50%.
  • Primerless Adhesion: Excellent unprimed bonding to porous substrates like concrete and natural stone.
  • Durable Weather Resistance: Withstands UV exposure, rain, snow, and temperature extremes.
  • Plasticizer-Free and Low-Staining: Protects the integrity of surrounding materials.
  • Easy Application: Applies smoothly across a wide temperature range.
  • Variety of Colors: Matches diverse architectural needs with options such as Gray, Charcoal, Sandstone, and more.

Applications

  • Weathersealing joints in natural stone, masonry, and precast concrete.
  • Curtainwall and mullion weatherseals.
  • Expansion and control joints in construction.
  • High-movement joints requiring flexibility and durability.

Why Choose DOWSIL™ 790?

DOWSIL™ 790 Silicone Building Sealant is engineered for the most challenging weathersealing applications. Its ultra-low-modulus composition reduces stress on substrates, ensuring reliable performance in joints with extreme movement. Its neutral-cure chemistry and low VOC content further enhance compatibility with modern construction standards.

This product was previously branded as Dow Corning. Learn more about the Dow Corning to DOWSIL rebranding.

Technical Specifications

Property Value
Color Options Adobe Tan, Black, Gray, Sandstone, White
Tack-Free Time 60 Minutes
Cure Time 168-336 Hours
Movement Capability +100/-50%
Durometer 15 Shore A
VOC Content 23 g/L
Shelf Life 360 Days

Available Sizes

  • 10.1 oz (300 mL) cartridge
  • 20 oz (590 mL) sausage
  • 2.9 kg pail

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