SPECIFICATION Sodium Sulfate (By Na2SO4) %> =99.2 Calcium Magnesium (By Mg) Content %< =0.15 Chloride (By Cl) Content %< =0.35 Iron (By Fe) Content %< =0.002 The Content of Substance Insoluble in Water %< =0.05 Moisture Content %< =0.20 White Content Purity>=85 PH: 6-8 Besides, we can also produce sodium sulphate anhydrous with special requirement (PH: 6-8, low content of Ca and Mg, Fe (<=100pm), Chloride (<=0.05%), high purity (Na2So4: 99.5% Min)