Polyester film is often referred to by its abbreviation, PET film. The chemical name for this type of plastic is polyethylene terephthalate, which is commonly shortened to PET. It is a versatile and robust plastic in film form of various thicknesses, widths and transparencies.

Polyester film, is a polymer resin of the polyester family. Sometimes known as PET (polyethylene terephthalate), it is also commonly referred to by some trademarked brand names such as Mylar® brand, Melinex ®, and Grafix's own DuraLar.