Ammonia solution sp. Gr. 0.91 about 25% nh3 suitable for mirror industry nh3 m.w 17.03 assay min 25% maximum limits of impurities : non-volatile matter 0.01% chloride(ci) 0.001% sulphate(so4) 0.002% arsenic(as) 0.00002% iron(fe) 0.0001% lead(pb) 0.0001% cas no : 1336-21-6 un no. 82672 hs code : 2814 20 00 r : 34-37 s : 7-26-363739-45 f :