We are offering ammonium sulphate extra pure (nh4)2so4 m.w. 132.14 minimum assay (acidimetric on dried substances) 98.5% ph(5% solution 20oc) 4.4-5.5 chloride(cl) 0.002% nitrate(no3) 0.002% heavy metals(as pb) 0.001% iron(fe) 0.001% arsenic(as) 0.0005% loss on drying(105oc) 1 % non-volatile matter 0.2% cas no : 7783-20-2 un no. Nr hs code : 3102 21 00 r : 363738 s : 26-36 f :