What are the meanings of 0.4 and PE of plastic bag "PE 0.4"?
2026-01-21
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In the context of a plastic bag,
PE stands for Polyethylene, the type of plastic material used. The number 0.4 indicates the thickness of the material, most likely in millimeters (0.4 mm), though it could refer to a different unit like microns depending on the regional standard. PE Explained
- PE (Polyethylene) is the most common type of plastic used globally, particularly for packaging applications such as plastic bags, films, and containers.
- It is a thermoplastic polymer that is valued for its versatility, durability, water resistance, and chemical resistance.
- The two main types are Low-Density Polyethylene (LDPE, which is more flexible and used for most bags) and High-Density Polyethylene (HDPE, which is more rigid and used for things like milk jugs). The material type can often be identified by a recycling code (usually #2 for HDPE and #4 for LDPE) found within a chasing arrows symbol.
0.4 Explained
The value 0.4 refers to the thickness of the plastic film.
- In many contexts, this number refers to 0.4 millimeters (mm).
- This is equivalent to 400 microns (since 1 micron = 0.001 mm) or approximately 16 mil (since 1 mil = 0.0254 mm).
- A bag with a thickness of 0.4 mm (400 microns) is considered very thick and heavy-duty, suitable for industrial use or sharp/heavy items. In comparison, standard grocery bags are typically much thinner, around 0.04 mm (40 microns).
| Marking | Meaning |
|---|---|
| PE | Polyethylene (material type) |
| 0.4 | Thickness, typically 0.4 mm (or 400 microns) |
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