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CAS#: 7757-82-6 | Formula: Na2SO4 | Specifications: Assay 99.0 % - Min, Calcium 0.01 % Max, Chloride 0.001 % Max, Heavy Metals (by ICP-OES) 0.0005 % Max, Insoluble matter 0.01 % Max, Iron 0.001 % Max, Loss on ignition 0.5 % Max, Magnesium 0.005 % Max, Nitrogen compounds (as N) 0.0005 % Max, pH of 5% solution @ 25C 5.2 - 9.2 pH, Phosphate 0.001 % Max, Potassium 0.01 % Max