| Conductivity (mS/cm) | |||||||
| Samples without HPW | 30˚C | 60˚C | 80˚C | Samples with HPW | 30˚C | 60˚C | 80˚C |
| SPEEK | 10.20 | 14.00 | 28.60 | - | - | - | - |
| SS2 | 16.42 | 30.56 | 45.37 | SH2 | 7.70 | 16.79 | 28.98 |
| SS4 | 25.80 | 49.69 | 67.80 | SH4 | 14.70 | 23.21 | 35.11 |
| SS6 | 7.77 | 14.54 | 21.96 | SH6 | 14.95 | 34.66 | 50.44 |