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Main absorption features of different polymers.
| Polymer | Type of plastic | Main spectral absorption features |
|---|---|---|
| Polyethylene terephthalate (PET) | Water bottle | 1130 and 1660 nm |
| Polypropylene (PP) | Rope | 1192, 1394, 1730 nm |
| Polyester (PEST) | Rope | 1130, 1413, 1660 nm |
| Low-density polyethylene (PE-LD) | Cup | 1192, 1394, 1730 nm |
