CAS 7778-80-5 appears in our catalog under these names: Potassium sulfate, Puratronic½, 99.997% (metals basis) , Potassium sulfate, 99% , Potassium sulfate, ACS, 99.0% min , Potassium sulfate, 99.99% (metals basis) . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 5g, 25g, 1000g, 5000g, 500g, 2kg, 100g.