CAS 7783-20-2 appears in our catalog under these names: Ammonium sulfate, Puratronic½, 99.999% (metals basis) , Ammonium sulfate, 98+% , Ammonium sulfate, 99.95% (metals basis) , Ammonium sulfate, ACS, 99.0% min , Ammonium sulfate, 0.5M aq. sol . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 10g, 50g, 250g, 1000g, 5000g, 100g, 500g, 2kg.