Assay(%)99.5MIN 99.3MIN 99MIN Moisture(%)0.7MAX 1MAX 1MAX Iron(%) 0.001MAX 0.001MAX 0.003MAX Buring residue(%)0.4MAX 0.4MAX 0.4MAX 0.0005MAX 0.001MAX Sulphates(%)0.02MAX 0.02MAX 0.02MAX PH 4.0-5.8 4.0-5.8 4.0-5.8