Dow Corning 999A Silicone


Dow Corning® 999-A Silicone Building & Glazing Sealant is intended for general construction applications. It may be applied as a primary seal to most glass, plastic and metal assemblies if tested and shown to be acceptable for the intended use.


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  • Resistant to sunlight, rain, sleet, snow, ultraviolet radiation, ozone and temperature extremes
  • Retains design properties even after years of exposure – seals remain watertight and weatherproof
  • Wide service temperature range from -60 to 177°C (-76 to 350°F) with intermittent temperatures up to 200°C (392°F)


  • One-part acetoxy RTV silicone sealant that cures in the presence of air and moisture