sapphire optics
Sapphire Properties
   
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sapphire optics  
Knowledge & Service >> Sapphire Properties
 
  Information of Sapphire
  Sapphire is a form of Aluminum Oxide (Al2O3). In its natural state, Al2O3 is a white powdery material.
  Sapphire is one of the hardest minerials and ranks a 9 on the Mohs scale.
  Sapphire offers wide band transmission from UV to Mid-IR (0.15-5.5µm). 
  Sapphire features exceptional properties of high hardness, high strength, scratch resistance, high temperature resistance, purity, chemical durability and superior radiation stability.
  These unique properties make sapphire ideal material for optical windows, tubes, rods and balls used in many Scientific, Industrial and Military applications.
sapphire-windows-sapphire-lens
Benefits of Sapphire
Extremely hard, strong and wear resistant
Excellent thermal conductivity/heat resistance
Exceptionalchemical stability
Superior dielectric material with a high dielectric constant
Extremely high melting temperature (2030 °C)
Excellent transmission bandwidths (UV to IR)
sapphire-windows-sapphire-lens
Sapphire Properties
Subjects
Units
Value
General
Chamical Formula
Al2O3
Melting Temperature
2040
Optical
Index of refraction
1.769 (parallel to C-axis)
1.760 (perpendicular to C-axis)
Infrared of penetrable index
>85%
Mechanical
Density
g/cm³
3.98
Mohs Hardness
9
Knoop Hardness
dan/mm²
1800 (parallel to C-axis)
2200 (perpendicular to C-axis)
Tensile Strength
GPa
0.19
Compressive Strength
GPa
2.1
Flexural Strength
GPa
340~380
Electrical
Dielectric Constant
9.3~11.5
Dielectric Strength
v/cm
4.8x105
Resistivity
Ω/cm
>1016(25)
Thermal
Thermal Expansion
6.7x10-6 (parallel to C-axis)
5.0x10-6 (perpendicular to C-axis)
Specific Heat (0~100)
cal/g
0.16

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Keywords: Sapphire Windows, Sapphire Lens, Sapphire Light Guides, Sapphire Balls, Sapphire Rods, Jewel Bearings, Sapphire Tube, sapphire watch glass
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