PE (Polyethylene) filler masterbatches are additives used in the production of monolayer films to modify the properties of the film. These masterbatches typically contain a high percentage of mineral fillers, such as calcium carbonate, talc, or other inert materials, which are mixed with PE resin to achieve specific characteristics in the resulting monolayer film.

Filler masterbatches can increase the opacity of monolayer films, making them less transparent. This is beneficial in applications where the film is used to block or reduce light transmission, such as in agricultural mulching films or blackout curtains.