Specifications
C-Axis Deviation +/-0.1°
Surface Quality:
S/D10/5
S/D20/10
S/D40/20
S/D60/40
S/D80/50
Orientation: Random, Zero°
Flatness: 633nm per 25.4mm
| Technical Data Sapphire / Corundum | ||
| Properties | Units | Value |
| Chemical Formula | Al2O3 | |
| Purity | ＞99.99% | |
| Density | g/cm3 | 3.98 to 4.1 |
| Hardness | Moh’s | 9 |
| Tensile Strength | MPa [kpsi] | 190 [28] |
| Compressive Strength | GPa [kpsi] | 2.1 [305] |
| Modulus of Elasticity | GPa [kip/in2] | 340-380 [49312 – 55114] |
| Friction Coefficient | 0.10 (Coefficient of dry friction on steel) | |
| Chemical Resistance | Inert to most chemical agents, even at high temperatures Attacked by HF at 300℃. | |
| Coefficient of Linear Expansion | °C-1 | 6.2×10-6 |
| PARA to C Axis, 20°C | ||
| Coefficient of Linear Expansion | °C-1 | |
| PERP to C Axis, 20°C | 5.4×10-6 | |
| Specific Heat | J/kg-K | 753 J/(K⋅kg) at 301°K |
| Thermal Conductivity, 20°C | W/m-K | 41.9 |
| Melting Temperature | °C [° F] | 2030 °C [3686 °F] |
| Maximum Useable Temperature | °C [° F] | 1950 ° [3542 °] |
| Dielectric Constant (Er) at 1 MHz | 7.5 to 10.5 | |
| Resistivity (25°C) | Ohm-cm | > 1016 |
| Ne (refraction index to λ = 589.3 nm) | 1.76 | |
| No (refraction index to λ = 589.3 nm) | 1.769 | |