| Sample | PHT temperature˚C | Thickness (m) | Reported Vickers microhardness8 |
| SHT | NA | 387 | 72 |
| P300 | 300 | 392 | 82 |
| P400 | 400 | 375 | 140 |
| P500 | 500 | 392 | 201 |
| P600 | 600 | 398 | 162 |
| P700 | 700 | 401 | 135 |