We are offering mercuric oxide red ar hgo m.w. 216.59 assay 99.0-100.5% minimum limits of impurities : substances insoluble in hcl 0.03% chloride(cl) 0.01% sulphate(so4) 0.005% total nitrogen(n) 0.005% lead(pb) 0.0005% copper(cu) 0.0005% cadmium(cd) 0.0001% zinc(zn) 0.0005% iron(fe) 0.005% substances not reducible with formic acid (residue on ignition) 0.025% cas no: 21908-53-2 un no. 6.11641 hs code : 2825 90 30 r : 262728-33 s : 13-28.1-45 f :