... BGRADE C1magnesium board compositionMagnesium oxide (activity 85%), magnesium sulfate, wood chips, silicon carbide, low-alkali glass ... fiber mesh,modifierMagnesium oxide (activity 85%), magnesium chloride, sawdust, perlite, alkali glass fiber mesh, ... modifierMagnesium oxide (activity 80%), magnesium chloride, sawdust, perlite, high alkali glass fiber mesh ...