ASSAY(CONTENT) 99.5%~100.5% LOSS ON DRYIN MOISTURE 7.5-9.0% SULFATE ASH ≤0.1% IRON ≤50PPM CHLORIDE ≤50PPM OXALATE ≤300PPM SULPHATE ≤150PPM HEAVY METALS ≤10PPM ARSENIC ≤1PPM