Ammonia solution 30% extra pure sp.gr. 0.89 nh3 m.w. 17.03 assay (acidimetric) about 30% maximum limits of impurities : chloride(ci) 0.002% sulphate(so4) 0.003% heavy metals(as pb) 0.0001% iron(fe) 0.0005% subst. Reducing kmno4(as o) 0.0008% residue on ignition(as sulphate) 0.003% cas no : 1336-21-6 un no. 82672 tariff : 2814 20 00 r : 34-37 s : 7-26-363739-45 f :