| Characteristic | Typical value |
| Diameter | 6 - 12 mm |
| Lenght | 15 - 50 mm |
| Density | 1150 - 1400 kg∙m−3 |
| Humidity | 8% - 12% |
| Thermal power | 4.7 - 5.5 kW∙kg−3 |
| Residual ashes | 0.3% - 0.6% |