Bond It 750ml No-Nonsense Fire Rated Expanding Foam Filler Sealant Hand Held This 750ml Canister of Fire-rated expanding foam has high thermal and acoustic insulation properties making it an excellent sealant/insulation material. B2 with CFC-free propellant is a one-component, self-expanding, ready-to-use polyurethane foam with propellants which are completely harmless to the ozone layer and meets the German Fire Class B2 (DIN 4102-Part 1) Up to 240 minutes fire rating Excellent Adhesion on most substrates High Bond Strength Efficient Seal against Smoke and Gas Excellent Filling Characteristics 750ml Canister Ideal for the Fixing and insulating of doors, window frames, insulating of pipes and filling holes and gaps, Filling of joints and fixing and insulating wall panels, corrugated roof sheets, roof tiles.