KMnO4 M.W. 158.03Assay(by iodometry) min 99.5%Substances insoluble in water max 0.1%Chloride & Chlorates(as Cl) max 0.003%Sulphate(SO4) max 0.01%Total nitrogen(N) max 0.003%Lead(Pb) max 0.002%Copper(Cu) max 0.001%Iron(Fe) max 0.002%