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Sunny Precision Optics Inc. |
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Sunny Precision Optics Inc. |
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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 |
