The barrier properties of polyethylene mean no or very little permeability of gases (e.g. oxygen), vapors (e.g. water vapour) and aromas. Depending on the film thickness, the following values result:
PE-LD films have low water vapor permeability and relatively high oxygen permeability.
The oxygen permeability of packaging films is usually measured on a flat film at a defined point at a temperature of around 23 ºC. The measuring method (DIN 53380-3) is standardized and very complex.