Flame-resistant all-purpose, fire-retardant foam sealant that exceeds testing standards. Self-extinguishing by eliminating oxygen flow. Using FireBreak in these penetrations blocks air infiltration, which means fire will take longer to burn through to adjoining rooms. Approved Type V residential fireblock penetration sealant. Meets UL 1715, UL-94 V-O, ASTM 814 E-84. Fills and seals service penetrations where fire spreads most quickly. Slows flame spread, UL tested / Class 1 Foam. Size 12 ozs.