Specifications:
| Height（mm） | Inside dia（mm） | thickness（mm） |
| 300 | 300 | 20～40 |
| 500 | 500 | 40～60 |
| 600 | 800 | 60～70 |
Properties:
| Bulk density | Heat conductivity | Cracking Strength | Carbon content | Hydrogen content | Nitrogen content | Ash content |
| 0.15～0.22g/cm3 | 0.12w/m.k(500℃) | 0.12MPa | >92.0% | 1.2% | 1.5% | 0.75% |