... sandedGRADE A without sandedGRADE BGRADE C1magnesium board compositionMagnesium oxide (activity 85%), magnesium sulfate, wood chips, ... chloride, sawdust, perlite, alkali glass fiber mesh, modifierMagnesium oxide (activity 80%), magnesium chloride, sawdust, perlite, high ... alkali glass fiber mesh, modifierMagnesium oxide (activity 70%), magnesium chloride, sawdust, perlite, high ...