Ammonium ferric sulphate dodecahydrate, min. 98,5 %, p.a., ACS, ISO, Molar mass (M) 482,19 g/mol, Density (D) 1,71 g/cm³, CAS No. [7783-83-7], EG-Nr. 233-382-4, Empirical formula (NH4)Fe(SO4)2 · 12 H2O