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 |