Flat Sapphire Crystal Glass Discs Watch Glass Mirror D20mm to D29.5mm T1.5mm

Product Name: Sapphire Crystal Glass Discs
Features: high gloss, no bubble, high temperature resistance, corrosion resistance, high hardness, high transmittance
Wave Bands: 185 - 5000nm
Tolerance: ±0.01 ~ ±0.05mm
Other Processing Technology: accurate profiling edge grinding, chamfering, hole opening, fine grinding and coating
EST: 3-7days

Note: Sapphire glass generally refers to synthetic sapphire, which is quite different from natural sapphire, which is generally used for the manufacture of wrist watch mirror. It is wear-resistant material with tungsten titanium alloy and high-tech ceramics. Although these materials can resist abrasion, they can not withstand strong impact, and some materials with the same hardness or higher may scratch the surface of these materials. The main component of natural sapphire and sapphire glass is alumina (Al2O3), and the chemical composition and physical properties are basically the same.

Other Physicochemical Properties
Material: Al2O3-Sapphire
Thermal Conductivity: 10K / M
Breaking Strength: 780MPa
Coefficient of Thermal Expansion: 5 x 10 - 6 / K
Density: 4g / cm3
Melting Point: 2030 ℃
Boiling Point: 3000 ℃
Conductivity: non conductive
Hardness: 9 Mohs, second only to diamond
Refractive Index: 1.76 - 1.77 @ 550nm