Silicon dioxide (SiO2) Appearance: colorless transparent pellets Density: 2.202 g/cm3 Vapor pressure: 1 Pa at 2000癈 10 Pa at 2200癈 Hardness(Mohs hardness): 5.5 Melting point: 1700℃ Solubility:non-soluble in water, soluble in acid Transmittance scope: 200-2000nm Refractive index(550nm): 1.46 Vapour deposition condition: evaporated by electron gun Vapour deposition temp.:1800-2200℃ Purity: >99.999% Applications: anti-reflection film, multi-layer film, filter, spectroscope, film for capacitors, etc. Specs: ?*2mm ?*3mm ?5*10t ?5*7t 1-2mm 1-3mm We are able to produce products of all materials and specs according to customer's demand