Firestop/Draft Sealant by Accumetric, LLC

BOSS 136 firestop/draft sealant is a single-component, fire-rated product. It is a noncombustible filler caulking used for fire-stopping applications in the annular space around wires, pipes, ducts, vents, cable lines and other penetrations to the building envelope. It is a non-slumping sealant that sets to form a hard surface.