The Sodium Sulphate Anhydrous min 99%, White content purity min 88%, Industrial Grade, PH value:6-8 About us : ... http://www.centralqd.comSpecification and details: ITEMSTANDARDsodium sulphate (Na2SO4), %:99.0 MIN.water insolubles , %:0.05 MAX.Ca + Mg (as Mg ... , %:0.20 MAX.Whiteness, %:86 MIN. ItemValueType IType IIGrade AGrade Asodium sulfate content, Na2SO4 %>99.198.3water insoluble substance %<0.040 ...