Properties of sapphire and sapphire wafers

Typical Properties of Sapphire Wafers and Substrates

Sapphire is a single crystal Al2O3 with a hexagonal (rhombohedral) crystal structure. Sapphire wafers and
sapphire substrates are available in C, R, A and M plane orientations.

Sapphire related services include, Sapphire wafer back-thinning, edge grinding, edge rounding, diameter reduction, hole drilling, chamfering, blending and polishing, v-grooves, surface pyramid structures, laser slag removal, slots and steps.

Technical Data Sheet

Name Orientation
C-Plane (0 Degree) 0001
R-Plane 1-102
A-Plane (Perpendicular to C) 11-20
M-Plane (Perpendicular to C and A)  
Mechanical Properties  
Density at 20°C 3.98 g/cm3
Hardness Knoop: 1500
Mohs: 9
Tensile Strength 275 - 400 MPa
40,000 - 58,000 psi
Flexural Strength 480 - 895 MPa
70,000 - 130,000 psi
Compression Strength (ultimate) 2.0 GPa / 300,000 psi
Young's Modulus (elasticity) 345 GPa / 50 x 106 psi
Bulk Modulus (compression) 250 GPa / 36 x 106 psi
Shear Modulus (rigidity) 145 GPa / 21 x 106 psi
Modulus of Rupture 350 - 690 MPa / 50,000 - 100,000 psi
Poisson's Ratio .29
Melting Point 2040°C / 3700°F / 2310 K
   
Thermal Properties  
Thermal Conductivity:  
Perpendicular to C at 23°C: 23.0 W/m°C
at 77°C: 16.8 W/m°C
Parallel to C at 24°C: 25.8 W/m°C
at 70°C: 17.35 W/m°C
Specific Heat at 18°C: 756 J/kg°C
at -182°C: 104 J/kg°C
   
Electrical Properties
Volume Resistivity at 25°C 1014 ohm/cm
Dielectric Strength 4.8 x 105
Dielectric Constant:  
   Perpendicular to C 9.4
   Parallel to C 11.5
Dissipation Factor 10-4tan δ


CTE (Coefficient of Thermal Expansion), x 106/ °C
Temp °C Perpendicular to C Parallel to C
70 6.95 5.90
100 7.08 6.05
200 7.66 6.60
300 8.30 7.32
400 9.00 8.07
500 9.63 8.88
600 10.45 9.77

 

 

 


Related Sapphire Web pages:

 

 

 

 

 

 

 

 

Return to Home Page Optical polishing, lapping, dicing and optical components polishing

print page

Last Updated 15 January 2013


Search

Power Search Powered by KSearch

 

Valley Design East
Two Shaker Road, Bldg. E-001
Shirley, MA 01464
Phone: 978.425.3030
Fax: 978.425.3031

Valley Design
West 
Santa Cruz, CA 95060 
Phone: 831.420.0595 
Fax: 831.420.0592


©2014 Valley Design Corp. All Rights Reserved