3M Fire Barrier IC 15WB Sealant - 4.5 gallon Pail

Is a latex sealant designed for use as a one-part fire, smoke, noxious gas and water sealant. In addition, the unique intumescent property of this material (expands when heated) means that as the noncombustible pipe, cable or pipe insulation is consumed by fire, sealant expands to maintain the penetration seal.