Synthetic sapphire (Corundum or Al2O3) single crystal is a highly trusted material with its excellent chemical stability, mechanical property, and light transmission. It is often used in aggressive environments where reliability, optical transmission and strength are required.
Synthetic sapphire is the hardest of all known oxide crystals with a 9 on the Mohs scale. Synthetic sapphire is second in hardness only to diamond, and retains its high strength at high temperatures. Synthetic sapphire crystals have good thermal properties, with excellent electrical and dielectric properties. In addition, synthetic sapphire combines zero porosity with near total resistance to acids and alkaline substances. Synthetic sapphire is insoluble in watch, and only reacts with hydrofluoric acid, phosphoric acid and potassium hydroxide at high temperature of above 300 degree Celsius.
Stanford Materials has been a provider of many kinds of synthetic sapphires, including sapphire wafers, sapphire lenses, sapphire substrates, watch glasses, and sapphire boule for many years. Synthetic sapphire is anisotropic hexagonal crystal. Its properties depend on crystallographic direction (relative to the optical C-axis). Our synthetic sapphire wafers are generated using the latest technology to maximize quality and transmittance. Because of our product’s quality, you can trust that it is your best choice for a variety of demanding applications.
|Physical and Optical Properties of Synthetic Sapphire|
|Transmission Range||170-6500nm, >80% in IR range|
|Specific Heat||0.418 W.s/g/K|
|Thermal Conductivity||25.12 W/m/K|
|Thermal Shock Resistance||790 W/m|
|Thermal Expansion Coefficient||5.8x10-6/K|
|Dielectric Constant||11.5°C (Parallel to the c-axis) 103-1010Hz 25
9.3°C (Perpendicular to the c-axis) 103-1010Hz 25
|Refractive Index||1.83 @0.26 m, 1.76 @0.63 m, 1.58 @5.57 m|