Firestop Sealants and Caulks are applied to gaps and voids made from penetrants through fire-rated walls. Firestop Sealants will stop the passage of smoke and flame through these voids during the event of a fire. Most Firestop Caulks and Sealants are "Intumescent" which means that they will expand and harden when the fire caulk hits an elevated temperature caused by a fire. The intumescent char will block and seal any gaps or openings and block smoke or other toxic fumes from passing through. Browse our inventory of fire sealant caulk below or contact us today for more information!