CAS 7783-83-7 appears in our catalog under these names: Ammonium iron(III) sulfate dodecahydrate, ACS, 98.5-102.0% , Ammonium iron(III) sulfate dodecahydrate, 98+% . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 500g, 2.5kg, 2500g.