... : http://www.centralqd.comSpecification and details: ITEMSTANDARDsodium sulphate (Na2SO4), %:99.0 MIN.water insolubles , %:0.05 MAX.Ca + Mg ... MIN. ItemValueType IType IIGrade AGrade Asodium sulfate content, Na2SO4 %>99.198.3water insoluble substance %<0.040.08calcium and magnesium content ... Fe) content, %<0.00150.008moisture, %<0.100.30whiteness, % min8680 Manufacturer of Sodium Sulphate Anhyrous(SSA ...