| Sample ID | Coating formulations | Critical normal load for scratch visibility (N) | |
| Top layer materials | Soft base layer thickness (µm) | ||
| TS |
| - | 5.8 |
| TB5 | TMPTA | 5 | Over 20 N |
| TB15 |
| 15 | Over 20 N |
| PS |
| - | Over 20 N |
| PB5 | PETA | 5 | Over 20 N |
| PB15 |
| 15 | Over 20 N |