| material | 99 %Al2O3 |
| volume density(g/cm3 ) | 3.89 |
| Dielectric constant(1MC,25°C)F/M | 10.0 |
| compressive strength(MPa,25°C) | 2940 |
| strength of extension(MPa,25°C) | 238 |
| Hardness (Hv0.5) | 15.0 |
| Heat expansion | 8.0×10-6/°C(40-800°C) |
| Poisson's ratio | 0.23 |
| Max Tem.(°C) | 1750°C |