| Corrosion product | Pure P.h.e. | |
| Assignment | Wave number (cmā1) | Wave number (cmā1) |
| OH strech | 3440 | 3413.77 |
| NH strech | 3247.90 | 3203.54 |
| CāO stretch | 1406.5 | 1409.87 |
| C=N stretch | 1250 | 1276.72 |
| C=C strech | 1637.45 | 1641 |
| NH bend | 1627.61 | 1631.67 |