Material grade | Electric resistance (uΩ.m) | Compressive Strength (Mpa) | Flexural Strength (Mpa) | Ash content (%) | Density (g/cc) |
| Standard | ≤ 8.5 | 20 | ≥ 11.5 | 0.15 | 1.6 -1.7 |
| High density | ≤ 8.5 | 28 | ≥ 13 | 0.06 | 1.7 -1.9 |
| High purity | ≤ 10 | 45 | ≥ 37 | 0.005 | 1.7-1.9 |
| Isostaic graphite | ≤ 15 | 65 | ≥ 40 | 0.06 | 1.75-1.9 |
Product quality protection 
