building materials

People in the purchase of PVC flooring, often ask whether it can pass the fire. Here, it is necessary for us to understand, by the way, how this level is divided, PVC flooring in the national standard GB8624-97 in the combustion performance of building materials will be issued several levels. 1, Class A: non-combustible building materials: almost non-combustible materials. 2, B1 level: refractory ...