This symbol indicates which material the plastic packaging is made. The number(5) can be replaced by the numbers 1 to 7, and often the abbreviation(pp) of the type of material is listed.
| Number |
Material | Application | Properties |
| 1 | PET - Polyethylene Terephthalate | PET bottles, plastic beer glasses, blisters | Very strong, untearable |
| 2 | PE-HD - Polyethylene high density | Bottles, crates | Good chemical barrier |
| 3 | PVC - Polyvinylchlorid | Films, medicine packaging | Not invironmentally friendly, rarely used |
| 4 | PE-LD - Polyethylene low density | Films, bags | Good resistance to tearing |
| 5 | PP - Polypropylene | Containers, jars, pails, caps | Cheap, strong resistance to high tempratures and many chemicals |
| 6 | PS - Polystyrene | Disposable tableware, foam materials | Cheap and easy to edit. |
| 7 | Other plastics | - | - |
This symbol indicates the packaging is suitable for food.