The Sodium Sulphate Anhydrous min 99%, White content purity min 88%, Industrial Grade, ... :0086-18205329887 Website: http://www.centralqd.comSpecification and details: ITEMSTANDARDsodium sulphate (Na2SO4), %:99.0 MIN.water insolubles , %:0.05 MAX.Ca ... (Fe) content, %<0.00150.008moisture, %<0.100.30whiteness, % min8680 Sodium Sulphate Anhyrous(SSA)99%