ASSAY(%) 99.4MIN 99.6MIN SULPHATE(AS SO4)(%) 0.10MAX 0.08MAX CHLORIDE(AS CI)(%) 0.004MAX 0.002MAX HEAVY METAL(AS PB)(%) 0.002MAX 0.001MAX ASH(%) 0.10MAX 0.08MAX IRON(AS PE)(%) 0.002MAX 0.001MAX