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3M Fire Block Foam FB-Foam is a fire block and draft stop used to help seal, fill, insulate and bond for non-rated residential and commercial construction. This foam-in-place fire block is heat-resistant (up to 240°F/115°C) and meets ASTM E 84 (mod) Class 1 for smoke spread and flame development. This fire block foam is ready-to-use and tack-free in approximately 5 minutes.