Sapphire
Sapphire has good thermal properties, excellent electrical
, dielectric properties, resistant to chemical attack, strength even at high
temperatures. These properties make Sapphire widely used in some environments
where reliability, optical transmission and strength are required.
| Crystal structure |
Hexagonal System |
| Density |
3.98 g/cm3 |
| Thermal Conductivity |
25.12 W/m/K |
| Thermal Shock Resistance |
790 W/m |
| Thermal Expansion Coefficient |
5.8x10-6/K |
| Hardness |
9 Mohs |
| Melting Point |
2040¡ã |
| Refractive Index |
1.83 @0.26mm, 1.76 @0.63mm, 1.58 @5.57mm |
| Dimension Tolerance |
-0.1 mm |
| Thickness Tolerance |
-0.2 mm |
| Flatness |
<¦Ë per 25 |
| Surface Quality |
80/50 Scratch&Dig |
| Parallelism |
<3 arc min |
| Perpendicularity |
<5 arc min |
| Wavefront Distortion |
<¦Ë/2 |
