... ://www.centralqd.comSpecification and details: ITEMSTANDARDsodium sulphate (Na2SO4), %:99.0 MIN.water insolubles , %:0.05 MAX.Ca + Mg (as Mg), ... ) , %:0.002 MAX.moisture , %:0.20 MAX.Whiteness, %:86 MIN. ItemValueType IType IIGrade AGrade Asodium sulfate content, Na2SO4 %>99.198 ... 60iron(Fe) content, %<0.00150.008moisture, %<0.100.30whiteness, % min8680 Manufacturer of Sodium Sulphate Anhyrous(SSA)99%