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Synthetic Sapphire is a single crystal form of corundum, Al2O3, also known as alpha-alumina, and single crystal Al2O3, have 9.0 hardness. Sapphire is aluminium oxide in the purest form with no porosity or grain boundaries, making it theoretically dense.
The combination of favourable chemical, electrical, mechanical, optical, surface, thermal, and durability properties make sapphire a preferred material for high performance system and component designs. For various semiconductor applications, sapphire is the best choice in comparison with other synthetic single-crystals.
| Industrial Sapphire Wafer Specifications | |
|---|---|
| Product name | industrial sapphire wafer |
| sapphire optical lens chemical formula | AL2O3 |
| Crystal structure | Hexagonal |
| Hardness Mohs | 9H |
| Compressvise strength | Gpa 2.0 |
| Density(20ºC) | 3.98g/cm³ |
| Fusion point | 2040ºC |
| Boiling point | 2980ºC |
| Coefficient of Thermal Expansion | α=5.8×10⁻⁶ /K |
| Specific heat | 0.418W.s/g/k |
| Thermal conduction | 25.12W/m/k(@100°C) |
| Optical transmission range | 0.17-5.5μm |
| Transmission(0.3~5um) | 85-88% |
| Refractive index | no=1.768nd |
| ne=1.76nd | |
| dn/dt | 13×10⁻⁶/K(@633nm) |
| Permittivity | 11.5(//c), 9.3(⊥c) |
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| Specifications Sheet | |
|---|---|
| Diameter (Φmm) | 8.0, 10.0, 12.7, 15.0, 20.0, 25.4, 30.0 |
| Thickness (mm) | 0.5, 1.0, 2.0 |
| Diameter Tolerance (mm) | +0.0/-0.2 (General), +0.0/-0.1 (High Precision) |
| Thickness Tolerance (mm) | ±0.2 (General), ±0.05 (High Precision) |
| Clear Aperture | >75% (Small Size), >90% (Large Size) |
| Parallelism | 3 min. (General), 10 sec. (High Precision) |
| Surface Quality: Scratch/Dig | 80/50 (General), 40/20 (High Precision) |
| Flatness (per 25mm@633nm) | λ(General), λ/4 (High Precision) |
| Bevel (face width x 45º) | <0.25mm |
| Coating | Upon customer's request |
| Refractive index (nd) | 1.768 |
| Coefficient of dispersion (Vd) | 72.2 |
| Density (g/cm3) | 3.97 |
| TCE(μm/mºC) | 5.3 |
| Soften Temperature(ºC) | 2000 |
| Knoop hardness(kg/mm2) | 2200 |