Magnesium oxide fireproof boards are a building material made of magnesium oxide, magnesium chloride, and alkali glass fiber net. They are available in sizes from 1,220x2,440mm to 900x2,400mm and thicknesses from 3mm to 18mm. Magnesium oxide boards have outstanding fireproof performance due to their density, flexibility, durability, antisepsis, heat preservation, sound insulation, and environmental friendliness as they contain no asbestos. Beijing Hocreboard Building Materials Co.,Ltd manufactures and sells these boards.