1.purity:99.99 2.density:2.20g/cm3 3.refractive index :1.46(0.05u) 4.transimssion band:0.20-9(um) Specifications4N Silicon ... Appearance:Metallic dark gray Trademark4NMain component Si, not less than (%) 99.99Content of other elements, not more than (%) Al0.003B0.0005Ca0 ... alloys, silicone, ceramics, electronics, military, chemical, and photovoltaic industries. 4n high purity silicon metal