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. Seals electrical runs through wall studs. Fills, seals, and insulates gaps up to 1/2". Air-tight water resistant seal. Tack free in 6 minutes, trims in 30 minutes. Cures rigid in 8 hours, Superior adhesion to building materials. One can equals up to 17 tubes of caulk, all direction dispensing, UL Classified.