FeCl3.6H2O M.W. 270.30 5 kg Assay(iodometric) min 99.0% Substances insoluble in HCl max 0.05% Free acid(as HCl) max 0.2% Free chlorine(Cl) max 0.005% Sulphate(SO4) max 0.05% Total Nitrogen(N) max 0.005% Heavy metals(as Pb) max 0.005% Arsenic(As) max 0.001% Substances not precipitated by NH3 (as sulphate) max 0.1%