Full definition
Material or system that seals pipe, cable and duct penetrations through fire-rated walls and floor assemblies to maintain compartment integrity. Materials: intumescent silicone (expands 5-10× when heated), mineral fiber mortar, elastomeric caulk, foam blocks. Ratings: 1H, 2H, 4H fire resistance. Required certifications: UL 1479, ASTM E814, FM 4991. Mandated by NFPA 101 and IBC building codes.