... asbestos 3) Moisture-proof CE,ISO, Magnesia oxide board/Mgo board/Fireproof board Materials:Magnesium chloride, magnesia, perlite, alkali endured ... , subways, gymnasiums, libraries, museums, theaters, factory buildings and computer laboratoriesTechnical date: HeadingUnit UsedInspection valueStandardDensitykg/m³.0.96-1.12g ... 0-2.5 are qualified, for 4mm, our board could reach 4.5 kj/m2. so our boards ...