Polyester film, when metallized, offers the best combination of oxygen and moisture barrier properties to keep food products fresh and favorable. PET is particularly suited to water- and solvent-based ink systems, pluspolyester film has the thermal properties and machinability to run well in both horizontal and vertical form and feed equipment.

Certain cartons (such as gable tops and aseptic bricks) are made from board sandwiched between or coated with thin layers of polymer. Often, foil is added for extra barrier performance. As many as five or seven layers of material may be involved in these structures, with polyester film often serving the role as moisture barrier enhancers, heat seals, or interlayer adhesion promoters (tie layers).

General packaging films and specialised barrier films:

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