Alias: Strontium difluoride. Molecular formula: F2Sr. Molecular weight: 125.62. Properties: Colorless powder, cubic crystal system (fluorite type). Density (g/mL, 25°C): 4.24. Melting point (°C): 1190. Boiling point (°C, normal pressure): 850. Boiling point (°C, 5.2 kPa): 2644. Refractive index (n20/D): 1.442. Slightly soluble in hydrochloric acid, very slightly soluble in water, insoluble in hydrofluoric acid, ethanol, and acetone. Main uses: Can be used in the manufacture of optical glass and single crystals for lasers. Also used in the pharmaceutical industry and daily chemical industry, such as an additive for anti-caries toothpaste, flux, high-grade electronic components, etc. Also used as a substitute for other fluorides. The company's annual output is 4,000 tons.