| ceramic physical property | ||||
| technical parameter | unit | 95%Al2O3 | 99%Al2O3 | 99.5%Al2O3 |
| content of Al2O3 | % | 95 | 99 | 99.5 |
| density | g/cm3 | 3.7 | 3.88 | 3.9 |
| hardness | HRA | 85 | 88 | 90 |
| porosity rate | % | 0.4 | 0.2 | 0.15 |
| fractural strength | MPa | 250 | 310 | 350 |
| coefficient of heat expansion | 10(-6)/K | 5.5 | 5.3 | 5.2 |
| thermal conductivity | W/M.K | 27.8 | 26.7 | 26 |