CRC Flame Resistant Sealant to fill, seal, bond, retrofit and insulate. Forms a permanent, waterproof, and airtight bond to most surfaces. UL classified as a flame resistant sealant. Meets key building code requirements as an approved fire block for service p

Flame Resistant Sealant to fill, seal, bond, retrofit and insulate. Forms a permanent, waterproof, and airtight bond to most surfaces. UL classified as a flame resistant sealant. Meets key building code requirements as an approved fire block for service penetrations.