... board is made of content of mgo, mgcl2, alkali-resistant grassfibre mesh, plantifibre, natural perlite and modifying agent etc.Production ... when applying with galvanized steel studs.2. Waterproof:The board can keep its original shape without any deformation or expansion ... used as wallboard, ceiling, fire proof board, water proof board and etc. Also, the board can be good construction material at such ...