Magnesium oxide board 1.Fireproof & Waterproof 2.Sound-insulation and sound-absorbing 3.Excellent impact resistance Magnesium oxide board is a kind of environmental-friendly fireproof board widely used in construction and decoration. It's made from magnesium oxide, magnesium chloride, fiberglass mesh, sawdust, perlite etc. We use, highly-purified active MgO as the main fireproof material of board ...