We are offering ammonium hydrogen carbonate extra pure nh4hco3 m.w. 79.06 minimum assay 98.5% maximum limits of impurities : non-volatile matter 0.01% chloride(cl) 0.005% sulphate(so4) 0.01% iron(fe) 0.002% lead(pb) 0.0005% cas no. 1066-33-7 un no. Nr tariff : 2836 10 00 r : 22 s : 22 - 24