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Specialty Products

PR-855 Fire Stop Foam

PR-855 fire stop foam is a black, two-part, room temperature vulcanizing (RTV) silicone foam that cures to a free blown density ranging from 15 to 20 lbs/ft3 within a period of one to three minutes after mixing. The mixed product will expand and cure to a foamed elastomer with only a slight exotherm (approximately 35 °F internal temperature rise).


PR-855 is supplied in PPG Semkit two-part disposable cartridges for easy mixing and application in the field. It is recommended to consult the PR-855 application practice before attempting to use this product.