Alpha Chemika Posted in Business on 1-22-18 We are offering ammonium nitrate extra pure nh4no3 m.w. 80.04 minimum assay 98.5% maximum limits of impurities : chloride(cl) 0.002% sulphate(so4) 0.01% phosphate(po4) 0.0005% heavy metals(as pb) 0.001% more… CAS No.: 6484-52-2 Purity: 98.5%