|Shape:||Custom Shape||Feature:||9H Hardness|
convex crystal glass
AR - Coating Polish Convex Sapphire Glass Ground And Beveled Edge Finish
|Thermal Properties||Mechanical Properties|
|Thermal Coefficient of Expansion||(0/300°C): 45-53 X 10 -7/°C||Density||3.97 g/cm3|
|Annealing Point||N/A||Knoop Hardness||1525-2000 Kg/mm2|
|Softening Point||2040°C / 3700 °F||Young's Modulus||50-55X106 psi / 345 GPa|
|Strain Point||N/A||Poisson's Ratio||.28-.33|
|Chemical Properties||Electrical Properties|
|Hydrolytic Resistance||N/A||Dielectric Constant||Avg. 9.3-11.5|
|Alkali Resistance||N/A||Dielectric Strength||4.8X105 v/cm|
Sapphire crystal is more reflective than mineral crystal due to its higher index of refraction. (1,8 compared to 1,47). Applying one or more layers of AR (anti-reflective) coating will limit this reflection to a very low level. Very often, lines and marks on the top surface of a sapphire crystal are mistaken for scratches but are actually the scratched AR coating, or just AR coating wearing off after time. An AR coating on the inside of the crystal provides a good AR performance while avoiding this problem. If you do scratch a sapphire crystal, then it cannot be polished away and will need to be replaced.
Ground and beveled
λ/4 @ 633 nm
≤3 arc min (≤0.9 mrad)
>80% of central diameter
1370 kg mm-2
3.4 x 1011 N m-2
22 W m-1 K-1
Thermal expansion coefficient
8.4 x 10-6 K-1
Overview of Synthetic Sapphire
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.
Applications of Synthetic Sapphire
Properties of Synthetic Sapphire
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.