... incombustibility A Class (GB8624-A)1200*2400mmThickness:3-20mm1,Fireproof :It belongs does not burn the materials ,its ... .Magnesium oxide board have been used primarily as fireproof materials for walls and ceiling in office building, ... and preservation structures ,sign boards ,fireproof partition walls,low fencing partitions .fireproof pipeline ,fireproof doors cornice baffle boards, public restroom ...