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Sapphire

Chemical formula

 

Al2O3

   

Physical:

  

Crystallographic structure

 

Hexagonal

Density

 

3.98 gm/cc

Melting point

 

2040°C

Solubility

 

98 x 10-6 gm/100 gm H2O

Maximum operating temperature

 

2000°C

Thermal expansion

 

3.2 - 8.4 x 10-6/°C

   

Optical:

  

Standard orientations

  
 C-Axis

(0001)

 A-Axis

(1120)

 M-Axis

(1010)

 R-Axis

(1102)

Lattice constant

 

a = 4.758 Å

  

c = 12.991 Å

Dielectric constant

 

10.6 parallel to C axis at 300 mHz

  

8.6 perpendicular to C axis at 300 mHz

Optical transmission range

 

0.15 - 5.5 microns

Refractive index

 

1.755 at 1.0139 microns

 

  • Sapphire is a most useful material for harsh environmental applications.
  • Excellent quality of hardness, high strength and chemical stability.

Protective windows:

Standard or UV stable
Maximum diameter: 8 inch
Minimum diameter: 0.25 inch
Minimum thickness: 0.33 mm
Finish (S/D): 80/50, 60/40 maximum
Typical usage: gas, temperature and pressure meter windows

Scanner windows:

Size: 8 " x 1.5 " or 6 " x 6
Minimum thickness: 0.33 mm
Finish (S/D): 80/50 or 60/40

Optical substrates, epi growth substrates and electro-optical units

Wedges:
Max. and min. wedge angle: 15 minute to 60 degrees
Maximum diameter: 4 inch
Finish (S/D): 80/50 or 60/40

Optical and mechanical rods, plates and parts

Wafer carriers:
Sizes: 1", 2", 3"and 4"diameter
Thickness: 0.33 mm, 0.45- 0.5 mm, 1 mm

Rods:
Diameters: up to 30 mm
Lengths: up to 300 mm
Tolerances: (standard) 0.05 mm
Produced by EFG growth process

Tubes:
Outside diameter: up to 40 mm
Inside diameter: over 0.8 mm
Lengths: up to 300 mm


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