Physical properties: GB No. 61503. CAS No. 1304-28-5. Name: Barium oxide; Another name: barium peroxide. Molecular formula: BaO. Molecular weight 153.34. Boiling point: 2000℃. Melting point: 1923 ℃.Micro-soluble in cold water, soluble in hot water, acid, ethanol. Density: relative density (water = 1) is 5.72. Stability: stable. Hazard label: 15 (hazardous materials, keep away from food). Mainly application: desiccant for gas, manufacturing barium peroxide and barium salt