Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

DOW DOWSIL 778 Silicone Liquid Flashing

DOW DOWSIL 778 Silicone Liquid Flashing is a high-performance, fast-curing, one-component silicone sealant designed for waterproofing roof penetrations and joints. It offers excellent adhesion to diverse substrates, UV resistance, and long-term elasticity without shrinkage or cracking. Ideal for HVAC, plumbing, and solar mounting applications.
  • dow dowsil 778 silicone liquid flashing_74f40de7
  • dow dowsil 778 silicone liquid flashing_74f40de7

Features Of DOW DOWSIL 778 Silicone Liquid Flashing

  1. High-performance, one-component, moisture-curing silicone liquid flashing that forms a durable, flexible, and fully adhered waterproof membrane upon cure.

  2. Excellent adhesion to diverse substrates including concrete, masonry, metal, coated steel, and most common building membranes without primers.

  3. UV-, ozone-, and weather-resistant formulation ensures long-term integrity under harsh outdoor exposure.

  4. Low modulus and high elongation (>400%) accommodates thermal and structural movement without cracking or delamination.

  5. Solvent-free and low-VOC (<10 g/L), supporting sustainable construction practices and compliance with stringent environmental regulations.

Typical Applications Of DOW DOWSIL 778 Silicone Liquid Flashing

  1. Roof-to-wall transitions and parapet base flashings in commercial low-slope roofing systems.

  2. Window and door perimeter detailing for air and water barrier continuity in high-performance building envelopes.

  3. Penetration sealing around pipes, vents, and conduits on roofs and terraces.

  4. Seam reinforcement and detail flashing over seams in single-ply membrane roofs (e.g., TPO, PVC, EPDM).

  5. Waterproofing details at deck-to-wall intersections and balcony edge conditions.

Specifications Of DOW DOWSIL 778 Silicone Liquid Flashing

Chemical TypeAcetoxy-cure silicone polymer
Product FormThixotropic liquid (brushable, rollable, or sprayable)
AppearancePale amber, translucent liquid
Primary ApplicationsBuilding envelope flashing and waterproofing details
Key FeaturesMoisture-curing, primerless adhesion, high elongation, UV stable
BenefitsReduces labor vs. sheet flashing; eliminates laps and seams; enables monolithic barrier performance
VOC Content<10 g/L (per ASTM D6886)
Cure Time (Surface Dry)Approx. 30–60 minutes (dependent on humidity and temperature)


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