| MAIN MADE CORUNDUM PROPERTY | ||
| General | Chemical Formula | Al2O3 |
| Crystal System | Trigonal | |
| Class | Hexagonal-scalenohedral | |
| Melting Temperature | 2030°c | |
| Thermal | Thermal Expansion | Parallel to C-axis: 6.7× 10-6 |
| Perpendicular to C-axis: 5.0×10-6 | ||
| Specific Heat | 0.18 Cal/gmoK（25℃） | |
| Mechanical | Density | 3.98 ~ 4.1g/cm3 |
| Hardness | 9Moh’s Scale | |
| （Hv）≥1700kg/mm2 | ||
| Modulus Of Elasticity | 340-380Gpa | |
| Compressive Strength | 2.1Gpa | |
| Tensile Strength | 0.19Gpa | |
| Optical | Index of Refraction | Parallel to C-axis:1.769 |
| Perpendicular to C-axis:1.76 | ||
| Index of IR Transmission | 85% | |
| Electrical | Electrical Resistance | 1016 Ω/cm(25°c) |
| Dielectric Constant | 7.5-10 | |
| Chemical | Corrosion Resistance | Can not be corroded by acid or alkali at normal temperature, only can be corroded by HF at 300°c |
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