| Item | Category | Unit | Diameter（mm） | |||||
| 75--200 | 250--350 | 400--500 | ||||||
| Top grade | First grade | Top grade | First grade | Top Grade | First grade | |||
| A | B | A | B | A | B | |||
| Resistivity (≤） | body | MΩ.m | 8.0 | 9.0 | 8.0 | 9.0 | 8.0 | 9.0 |
| joint | 7.5 | 7.5 | 7.5 | |||||
| Flexural strength（≥） | body | Mpa | 10.0 | 10.0 | 8.0 | |||
| joint | 15.0 | 15.0 | 15.0 | |||||
| Elastic modulus（≤） | body | Gpa | 12.0 | 12.0 | 12.5 | |||
| joint | 14.0 | 14.0 | 14.0 | |||||
| Bulk density（≥） | body | G/cm³ | 1.58 | 1.58 | 1.58 | |||
| joint | 1.68 | 1.68 | 1.68 | |||||
| Thermal expansion coefficient（≤）（100-600）CET | body | ×10-6/℃ | 2.7 | 2.7 | 2.7 | |||
| joint | 2.5 | 2.5 | 2.5 | |||||
| Ash value（≤） | 0.3 | 0.3 | 0.3 | |||||
| Note: The ash content and the coefficient of thermal expansion are reference numbers. | ||||||||
