PET Film is a high performance, crystal clear thermoplastic made from ethylene glycol and dimethyl terephthalate (DMT). Compared with other common plastic films, PET film has higher tensile strength, excellent dimensional stability, low moisture absorption and maintains good physical properties in a fairly wide temperature range. It also has excellent UV resistance, excellent electrical properties, good optical clarity, high gloss and good gas barrier properties, but only moderate moisture resistance. It is an ideal film for high-quality printing and lamination, and is ideal for high-performance plastic films and sheets. It has a relatively high melting point, making it suitable for applications requiring autoclaving.
It is generally considered a specialty film due to its higher price relative to PVC, PE and PP films.
PET can be metallized to improve gas barrier properties for demanding applications where product shelf life is important.
PET films are ideal for a wide range of industrial, electronic and automotive applications. It is fully recyclable and can be easily reprocessed into many other products for many different applications.
However, unlike paper and other cellulosic products, PET does not break down easily. However, biodegradable additives can be used to enhance the biodegradability of this plastic without affecting its physical properties.
The most important polyester films are biaxially oriented PET or BOPET. 1 Compared to other common plastic films, it has better retention of physical properties over a fairly wide temperature range of about -70°C to 100°C.
Despite the higher price, BOPET has found many high-volume applications requiring this stronger and dimensionally stable film. A major disadvantage of BOPET is higher manufacturing costs and higher capital investment in equipment.