... ,MgCl2,Fiberglass mesh We offer Grade A without sanded magnesium oxide board also: ALL LEVELS OF MGO BOARD TABLENOLevelComparison itemGRADE ... room, do not know the analysis methods of magnesium oxide (MgO) and magnesium chloride (MgCl2), without inspection of raw materialsNo chemical ... life 50 years10 years1 year1 month Fiberglass board,magnesium oxide fireproof board,fireproof insulation board