A commerical quality, intumescent, non combustible fire, smoke and draft stopping sealant. XtraStop550 is designed for filling areas around wires, vents, pipes, ducts and other wall penetrations & construction voids. The product is a commercial quality, intumescent, non-combustible fire, smoke and draft prevention sealant. Water-based, it can be used wherever ASTM E-814 Specification is needed. The product is engineered to withstand 3000 degrees for up to 8 hours, and can be safely removed with soap and water prior to curing.