Magnesium oxide, min. 98 %, Ph.Eur., USP, heavy, Molar mass (M) 40,30 g/mol, Density (D) 3,58 g/cm³, Boiling point (bp) 3600 °C, CAS No. [1309-48-4], EG-Nr. 215-171-9, Empirical formula MgO