CAS 7727-21-1 appears in our catalog under these names: Potassium Persulfate, Potassium peroxydisulfate, 97% , Potassium peroxydisulfate ACS, 99.0% min , Potassium peroxydisulfate, ACS, 99.0% min , Potassium persulfate, 99+%, ACS reagent. Offered by: TRC, Thermo Scientific (Alfa Aesar), Thermo Scientific (Acros), Thermo Scientific (Fisher), Chemat. Available pack sizes: 10g, 1g, 2500g, 500g, 250g, 1kg, 2.5KG, 5KG.