... ,wood fiber etc .Incombustible: A Grade, GB8624Fire resistance :incombustibility A Class (GB8624-A)Density : 800-950kg/M2Moisture Content ... ,Vertical>6.0N/mm2Radioactivity :confirming to GB6566-2001 A-Class.Specifications:Raw material:Magnesium oxide , magnesium ... ,wood fiber etc .Incombustible: A Grade, GB8624Fire resistance : incombustibility A Class (GB8624-A)1200*2400mmThickness:3-20mm1,Fireproof ...