... board widely used in construction and decoration.1:Material:1:Magnesium oxide, 2:Magnesium chloride,3:Fiberglass mesh, 4:Sawdust, 5 ... :Perlite etc. We use, highly-purified active MgO as the main fireproof material of board, high-quality MgCl ... -combustible perlite as filling materials.2:Performance: Fireproof MgO board's unique smooth and rough surface, is providingdiversified functions ...