... :0086-18205329887 Website: http://www.centralqd.comSpecification and details: ITEMSTANDARDsodium sulphate (Na2SO4), %:99.0 MIN.water insolubles , %:0.05 MAX.Ca ... , Na2SO4 %>99.198.3water insoluble substance %<0.040.08calcium and magnesium content (in Mg), %<0.100.25chloride content (in CL), %<0 ... (Fe) content, %<0.00150.008moisture, %<0.100.30whiteness, % min8680 Sodium Sulphate Anhyrous(SSA)99%