1,non-toxic, zero radioactivity,non-asbestos 2, Fireproof Grade Class A1 3 Fire Times:1.5,hours,2 hours ,4hours. 3,Light Vermiculite fireproof doors are filled with vermiculite senior fire-resistant core as the fire doors core: Its advantages as follows: 1 fire insulation, sound insulation, environment-friendly , its indicators are better than other fillings2light weight.To the same ...