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CAS#: 7778-80-5 | Formula: K2SO4 | Specifications: Assay 99.0 % - Min, Heavy Metals (by ICP-OES) 0.0005 %, Insoluble 0.01 %, pH of 5% solution 5.5 - 8.5 pH, Chloride 0.001 %, Nitrogen compounds (%) 0.0005 %, Sodium 0.02 %, Calcium 0.01 %, Magnesium 0.005 %, Iron 0.0005 %