Features and Applications of PET Films
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FEATURES
• Polyester or polyethylene terephthalate (PET) is a high-performance, crystal clear thermoplastic made from ethylene glycol and dimethyl terephthalate (DMT). In comparison with other common plastic films, PET film has higher tensile strength, excellent dimensional stability, low moisture absorption, and good retention of physical properties over a fairly wide temperature range. It also has superior UV resistance, excellent electrical properties, good optical clarity, high gloss, and good gas barrier but only moderate moisture barrier properties. It is the ideal film for quality printing and lamination and a good choice for high-performance plastic films and sheets. It has a relatively high melting point, which makes it suitable for applications that require sterilization at high temperatures.
• The most important polyester film is biaxially oriented PET or BOPET. In comparison 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 its higher price, BOPET has found many high-volume applications that require this stronger and dimensionally stable film. A major drawback of BOPET is the higher manufacturing costs and higher capital investment in equipment.
Because of its higher price relative to PVC, PE, and PP film, it is generally considered a specialty film.
• PET can be metalized which results in improved gas barrier properties for demanding applications where long product shelf life is important. PET film is well suited for a broad 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 cellulose products, PET does not readily decompose. However, biodegradable additives are available that enhance the biodegradation of this plastic without affecting its physical properties.
APPLICATIONS
PET film has a wide range of applications due to its high stability in physical and chemical properties, and its high transparency and recyclability. Specific application areas include magnetic recording, photosensitive materials, electronics, electrical insulation, industrial films, packaging decoration, screen protection, optical grade mirror surface protection, etc.
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