| Material A | Material B | Material C | ||||||
| Vf | mf | df (μm) | Vf | mf | df (μm) | Vf | mf | df (μm) |
| 0.38 | 0.79 | 12 | 0.47 | 0.71 | 8 | 0.45 | 0.70 | 18 |