magnesium oxide board Fireproof : Grade A Keep warm, insulate against heat, ... resistant4) Construction simple, easy and swift, easy to decorate, easy to cut, bore, plane, shear ,good surface finish ... industrial building, residential housing, public place and so on.Specifications:Thickness :3-20mmMax width:1220mmMax length:3000mmEdges: ... board for ceiling , fireproof door , partition wall, and so on