| Physical Properties | |
| Color | Dark Brown |
| Crystal Form | Alpha-alumina trigonal system |
| Hardness | 9.0 Mohs scale |
| Melting Temperature | About 2050 ℃ |
| Maximum Use Temperature | 1800℃ |
| True Density(g/cm3) | ≥3.90 |
| Magnetic Material | 0.01% |
| Grit NO. | F12 | F14 | F16 | F20 | F24 | F30 | F36 | F40 | ||
| B.D. | 1.85 | 1.82 | 1.80 | 1.78 | 1.76 | 1.74 | 1.72 | 1.69 | ||
| Grit NO. | F46 | F54 | F60 | F70 | F80 | F100 | F120 | F150 | ||
| B.D. | 1.67 | 1.65 | 1.63 | 1.60 | 1.57 | 1.54 | 1.51 | 1.49 | ||
| Grit NO | F180 | F220 | ||||||||
| B.D | 1.47 | 1.45 | ||||||||
