1,non-toxic, zero radioactivity,non-asbestos 2, Fireproof Grade Class A1 3 Fire Times:1.5,hours,2 hours ,4hours. 3, ... better than other fillings2light weight.To the same specifications, vermiculite fireproof door is only half of the weight of traditional products ... , one hour, and so on all levels. 7 vermiuclite fire board for fire door