... the materials ,its ignition point in 2700'c Specification:Raw material: Magnesium oxide , magnesium chloride ,fiber glass ,perlite ... 6.0N/mm2Radioactivity :confirming to GB6566-2001 A-Class.Specifications:Raw material:Magnesium oxide , magnesium chloride ,fiber glass ,perlite ... ,planning drilling ,nailing and cutting etc .Magnesium oxide board have been used primarily as fireproof materials for walls ...