Description : Very fine, light white powder odourless. 15 gm. occupies a volume of about 150 Ml Solubility : Practically insoluble in water and ethanol 95%. It dissolves in dilute acids with at most slight effervescence Arsenic : Not more than 4 ppm Heavy Metals : Not more than 30 ppm Chloride : Not more than 0.125% Sulphate : Not more than 1.0% Calcium : Not more than 1.5% Iron : Not more than 0.1% Soluble Subs. : Not more than 2.0% Subs.Insoluble in acetic Acid : Not more than 0.1% Loss on Ignition : Not more than 8% Standards/Assay : Light magnesium oxide contains not less than 98.0% and not more than 100.5% of magnesium oxide.