Building materials play an important role in the fire prevention measures of buildings, so each country has strict corresponding requirements for the flame retardancy of building materials. Among them, the building material fire test standard BS 476 is also one of the important test standards, so what are its requirements for building material fire resistance? BS 476-7 Fire test on building materials and structures－standard name: BS 476-7: Part 7: Method of test to determine the classifica