Sapphire Crystal
Sapphire Crystal have been used as watch cover for almost 100years. Watch makers use it as watch cover mainly by it's good strengs properties. Sapphire is only sofer than diamond by Moh's hardness, it means sapphire Crystal can be only scratched by diamond.
Sapphire also have a good light transmittance ability,it can transmitt the light from 190nm~2100nm. from DUV~IR.
We have various stocked sapphire watch covers for your choosing, MOQ from 1pcs! Low Price, best quality you can find in the world!
Basic Properties Of Synthetic Sapphire
|
Properties |
Index |
Chemical Formula: |
Al2O3 |
Optical Index Of Refraction: |
No:1.768/ Ne:1.760 589.3nm |
Compressive Strength: |
300,000 PSI |
Flexural Strength : |
100,000 PSI |
Tensile Strength: |
58,000 PSI |
Mohs Hardness: |
9 Grade |
Maximum Temperature (Continuous): |
2000℃ |
Coefficient Of Expansion-Perpendicular to C-axis: |
4.3x10-6/℃
|
Coefficient Of Expansion-Parallel to C-axis: |
5.4x10-6/℃ |
Conductivity: |
46w/mk |
Specific Heat (0~100℃): |
0.16cal/g℃ |
Please contact us if you want to know more, also you can check our stocked
Sapphire Crystal