Sodium Sulfate (By Na2SO4) % > =99.3 Calcium Magnesium (By Mg) Content %< =0.10 Chloride (By Cl) Content %< =0.05 Iron (By Fe) Content %< =0.001 The Content of Substance Insoluble in Water %< =0.02 Moisture Content %< =0.10 White Content Purity>=90 PH: 6-8 PARTICLE SIZE: 100-180 MUSH