Table 4
Summary of the filtration experiments results.
| Filtration | Aging | Pre-filtration | Filtration temperature (°C) | Filter mesh (μm) | FR250 | Average viscosity loss (%) |
|---|---|---|---|---|---|---|
| 1 | No | No | Ambient (~25 ) | 8 | 106 | 65.9 |
| 2 | 24 h at 90 °C | No | 90 | 8 | 2.91 | 21.2 |
| 3 | 24 h at 90 °C | No | 90 | 1.2 | 5.37 | 70.1 |
| 4 | 24 h at 90 °C | 8 μm2 * | 90 | 1.2 | 1.51 | 21.3 |