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Identification system for packaging materials.
| Material | Abbreviations | Numbering |
|---|---|---|
| Low-density polyethylene | LDPE | 4 |
| Polypropylene | PP | 5 |
| Polystyrene | PS | 6 |
| Corrugated fiberboard | PAP | 20 |
| Non-corrugated fiberboard | PAP | 21 |
| Paper | PAP | 22 |
| Steel | FE | 40 |
| Wood | FOR | 50 |
Always check your local regulations.