... , fireproof rate B1 ISO certificate 1.FeatureMagnesium Plain Board (usually called magnesium oxide board ) is combined system of Mgo, MgCl2 and H2O ... , airport, subway, stadium, library, museum, theater, workshop, computer room, indoor swimming pool, outdoor advertisement, base board of all kinds of decoration and ... : 1220*2440mm ,with the thickness of 3-20mm Magnesium fireproof board