Sapphire

More than 98% LEDs are based on sapphire

Excellent physical and chemical properties of sapphire make it an indispensable component for a variety hi-tech applications. Sapphire crystal lattice is the best match for mass production of nitride-based light emitting diodes (LEDs).

Versatile material of the future

The latest achievements in sapphire growing and processing make it available for a variety of new promising applications including consumer electronics, dentistry, spacecraft windows and RFICs. Unparalleled hardness, outstanding chemical resistance, low refractive index and melting point over 2000 °C make synthetic sapphire a versatile material of the future.

 

Products «Monocrystal»

Sapphire wafers

Sapphire wafers

Our sapphire substrates increase LED brightness and narrowed wavelength distribution

Sapphire ingots

Sapphire ingots

Monocrystal is the world’s largest sapphire ingot manufacturer

Sapphire crystal screens

Sapphire crystal screens

For screen cover of mobile devices

Sapphire watch glass blanks

Sapphire watch glass blanks

Watch glasses made of our sapphire provide excellent adhesion with different coatings

Sapphire properties

General
Chemical composition: Al2O3
Growing method: Kyropoulos
Crystal structure: hexagonal
a = b = 4.77 A
c = 13.04 A
Thermal
Melting point: 2050 °C
Linear expansion coefficient: 6,7 x 10-6 / °C parallel to С axis
5.0 x 10-6 / °C perpendicular to С axis
Thermal conductivity: 46,06 W/(mK) (0°C)
Mechanical
Density 3,98 g/cm3
Hardness Mohs: 9
Knoop: 1900 parallel to С axis
2200 perpendicular to С axis
Tensile strength: 400 MPa (25°C) 275 MPa (500°C) 345 MPa (1000°C)
Flexural strength: 450-895 MPa
Compression stress: 2,0 GPa
Young's modulus 345 GPa
Electric
Dielectric permeability: 9,3 (103 - 109 Hz, 25°C) perpendicular to С axis
11,5 (103 - 109 Hz, 25°C) parallel to С axis
Specific resistivity: 1016 Оhm·сm (25°C)
1011 Оhm·сm (500°C)
106 Оhm·сm (1000°C)

Sapphire parameters

Resistant to high temperatures Melts only at 2050°C. Chemically inert at high temperature
Hard and durable
  • Scratch resistant to all materials but diamond
  • High pressure resistant
  • Abrasion resistant
Resistant to most agressive environments
  • Long-life performance, e.g. 5 times longer than quartz
  • High chemical purity
Wide transmittance range from UV to IR 80~90% at 0,25 - 4,50 um
High thermal conductivity Provides rapid heating and cooling
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