Impedes the spread of fire and smoke through service penetrations. Recognized as an alternative fireblocking material for residential construction with three floors or less. Tested according to ASTM E84, ATM E814 (modified) , UL1715. Bright orange foam for easy code identification. Seals service penetrations between floors and electrical runs through wall studs. Air-tight water resistant seal. Superior adhesion to building materials. Tack free in 6 minutes, trims in 30 minutes. Cures rigid in 8 hours. One can equals up to 19 tubes of caulk, all direction dispensing, UL Classified.