... industry standard, and we have perfact management system. Na2SO4 % ≥ 99%Water insoluble matter % ≤ 0.05Ca and Mg % ≤ 0. ... 35Fe % ≤ 0.002Moisture % ≤ 0.20Whiteness % ≥ 88PH value : 9 - 11anhydrous sodium sulphateis a kind of material which is used for industry ... ,widely used for washing, Sodium Sulphide, textile print, glass, paper-making, leather manufacturing, ...