... .Green ,natural Brief introductionMagnesium Oxide Fireproof Board(usually called magnesium oxide board) is the building material widely used ... radioactivity.. Composition The materials of paper magnesium fireproof board are Magnesia(MgO), Magnesium Chlorid(MgCl2) and Alkali ... , factory shopping malls, cinemas, theatres, hospitals, train or bus terminals, airports, and school constructions. Mgo ...