Description: 
Appearance:Colorless crystalline or white powder.
Properties:Very slightly soluble in water (18 ℃, 87mg/L), slightly soluble in dilute acids (especially nitric acid). The relative density 3.148.  melting point1248℃ . The boiling point 2260℃ 
Uses:Optical lens coating. Ceramics, electronics industry.
Storage:Sealing preservation. Also can use glass gar.