| Samples | T˚ of carbonization (en ˚C) | Impregnation rate | Agent activant | Carbonization time |
| Samples 1 | 400 | 5.0 g coal/50ml | KOH 10−1 N, 3 × 10−1 N et 5 × 10−1 N | 1 h 30 mn |
| Samples 2 | 700 | 5.0 g/50ml | KOH 10−1 N, 3 × 10−1 N et 5 × 10−1 N | 1 h 30 mn |