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Sapphire Crystal Substrate, Al2O3

Sapphire Crystal Substrate, Al2O3

Sapphire crystal substrate, also known as Al2O3 substrate, is a high-quality single crystal substrate made from sapphire, which is a type of corundum mineral. Sapphire crystal substrates are widely used in various industries, such as semiconductor, optics, and electronics, due to their excellent mechanical, thermal, and electrical properties.

Sapphire crystal substrates are highly transparent in the visible and near-infrared regions, making them ideal for optical applications such as windows, lenses, and prisms. They also have a high melting point, which makes them suitable for use in high-temperature applications. Additionally, sapphire crystal substrates are highly resistant to chemical and mechanical damage, making them durable and long-lasting.

Sapphire crystal substrates are available in various shapes and sizes, such as round, square, and rectangular. They can also be custom-made to meet specific requirements. The crystal structure of sapphire is hexagonal, which means that sapphire crystal substrates have anisotropic properties. This can be an advantage or disadvantage depending on the application.

Overall, sapphire crystal substrates are a versatile and reliable material that is widely used in many different industries for their unique combination of properties.


Catalog No. CERAMICS
Size Customized
Material Al2O3
Purity 95% 99% 99.7%
Density 3.8~3.9 g/cm3


At CG Material, we offer high quality Sapphire Crystal Substrate, Al2O3 with exceptional purity and precision in terms of size. Our products range in diameter from 1mm to 100mm and have a purity level of up to 99.8%. We also provide custom manufacturing options for special shapes to meet specific needs.

Sapphire Crystal Substrate Specifications

Crystal Class

Hexagonal system

Lattice Constants

a=4.785, c=12.991



Melting Point

2040 °C



Elastic Coefficient

C11= 495; C12=160; C33= 497; C44= 146; C13= 115; C14= 23 GPa

Thermal Conductivity

46.06 @ 0 oC, 25.12 @ 100 oC, 12.56 @ 400 oC ( W/(m.K) )

Thermal Expansion

7.5 x 10-6 /℃

Standard Orientation


Standard Size

 5x5mm, 10x10mm, Dia1"(25.4mm), Dia2"(50.8mm)

Or customized.

Standard Thickness

0.5mm, 1.0mm, 2.0mm, 5.0mm

Dielectric Constant

~9.4@ 300K at A-axis ~11.58@ 300K at C-axis


Single side polished or Double side polished

Sapphire Crystal Substrate Applications

Sapphire Crystal Substrates are used in the following applications:

– Sapphire substrates: IR Detectors; microwave integrated circuits;
– Aerospace: withstand high heat, windows, countermeasures lamps;
– Medical: surgical systems, contact tips for various surgical laser applications, endoscope lenses;
– Watch industry.



We handle our products with care to ensure they remain in their original condition during storage and transportation and to preserve their quality.



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