ASMACO FIRESTOP SILICONE SEALANT is a single component high performance gun grade Fire-Stop Weather Sealant based on fire resistant Silicone formulation. ASMACO firestop silicone sealant helps to protect combustible & non-combustible penetrations for up to 4 hours fire rating. This product can be used for sealing all movement joints up to 50% & restricts the passage of fire & smoke.