AR - Coating Polish Convex Sapphire Glass Ground And Beveled Edge Finish

Basic Information
Place of Origin: Guangdong, China (Mainland)
Brand Name: Tianzhili
Model Number: customized
Price: US $4.50
Detail Information
Material: Sapphire Size: 1-200mm
Shape: Custom Shape Feature: 9H Hardness
Surface Treatment: Polish Service: OEM,ODM
Coating: AR-Coating Application: Watch Glass
High Light:

convex sapphire


convex crystal glass

Product Description


AR - Coating Polish Convex Sapphire Glass Ground And Beveled Edge Finish
Product Description

Thermal PropertiesMechanical Properties
Thermal Coefficient of Expansion(0/300°C): 45-53 X 10 -7/°CDensity3.97 g/cm3
Annealing PointN/AKnoop Hardness1525-2000 Kg/mm2
Softening Point2040°C / 3700 °FYoung's Modulus50-55X106 psi / 345 GPa
Strain PointN/APoisson's Ratio.28-.33


Chemical PropertiesElectrical Properties
Hydrolytic ResistanceN/ADielectric ConstantAvg. 9.3-11.5
Acid ResistanceN/AResistivityN/A
Alkali ResistanceN/ADielectric Strength4.8X105 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.







Size tolerance


Edge Finish

   Ground and beveled

Surface Quality

   40-20 scratch-dig

Surface Flatness

λ/4 @ 633 nm


    ≤3 arc min (≤0.9 mrad)

Clear Aperture

  >80% of central diameter

Hardness (Knoop)

1370 kg mm-2

Young's modulus

3.4 x 1011 N m-2

Thermal Limit

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

  • UV and IR Optics - often used as infrared filters in military and industrial applications
  • Watch glasses, watch crystals, and gauge
  • Silicon on sapphire wafers; Superconductor substrate
  • High temperature and pressure windows, or where corrosion resistance and abrasion resistance are required
  • Electrical insulators
  • Thin film deposition
  • Transparent electronic substrate

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.

Contact Details

Phone Number : +8617722965647

WhatsApp : +8618606222729