Polyethylene terephthalate (PET) is a plastic from the polyester family. It is processed and used in many forms. Among the best known uses are the production of plastic bottles of all kinds and processing into textile fibres. Due to a special processing PET can be absolutely colourless and have a high light transmission. Therefore it is often used as food packaging or bottle. Besides its use as a high-quality packaging material for food, PET is also used in the clothing industry (textile fibres) and in medical technology.