Prevent the spread of flames, smoke, and toxic flumes with the HydroFlame fire barrier water tight sealant. Great for sealing cracks, seams, and small openings, this fire rated caulk can be easily dispensed from a caulking gun or trowel, and is water based, paintable, flexible, and features a low VOC. Firestop mortar is safe for use with plastic and metallic pipes, and the firestop canister is tested to ASTM E814, UL 1479, CAN/ULC S115, ASTM E1966, UL 2079 and ASTM G21 testing standards.