1) Chemical data :
Al2O3 | SiO2 | CaO | MgO | Na2O |
92~93% | 3~6% | 1~1.6% | 0.2~0.8% | 0.1% |
2) Physical data :
Specific gravity (g/cc) | >3.60 |
Apparent porosity (%) | 0 |
Flexural Strength (20ºC, Mpa) | 280 |
Compressive strength (20ºC, Mpa) | 850 |
Rockwell hardness (HRA) | 80 |
Vickers hardness (hv) | 1050 |
Moh’s hardness (scale) | ≥9 |
Thermal Expansion (20-800ºC, x10-6/ºC) | 8 |
Crystal Size (μm) | 1.3~3.0 |