We offer ammonium iodide extra pure nh4i m.w. 144.94 asssay(arg.) 99% ph(5% solution) 4.5-6.5 chloride and bromide(as cl) 0.02% sulphate(so4) 0.05% copper(cu) 0.001% iron(fe) 0.001% nickel(ni) 0.001% lead(pb) 0.001% cas no : 12027-06-4 un no. Nr tariff : 2827 60 90 r : 3637-38 s : 26-36 f :