Polyethylene terephthalate (sometimes written poly(ethylene terephthalate)), commonly abbreviated PET, PETE, or the obsolete PETP or PET-P, is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containersfor liquids and foods, thermoforming for manufacturing, and in combination with glass fibre for engineering resins.
It may also be referred to by the brand names Terylene in the UK Lavsan in Russia and the former Soviet Union, and Dacron in the US.
The majority of the world’s PET production is for synthetic fibres (in excess of 60%), with bottle production accounting for about 30% of global demand.In the context of textile applications, PET is referred to by its common name, polyester, whereas the acronym PET is generally used in relation to packaging. Polyester makes up about 18% of world polymer production and is the fourth-most-produced polymer after polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC).
PET consists of polymerized units of the monomer ethylene terephthalate, with repeating (C10H8O4) units. PET is commonly recycled, and has the number “1” as its resin identification code(RIC).
Depending on its processing and thermal history, polyethylene terephthalate may exist both as an amorphous (transparent) and as a semi-crystalline polymer. The semicrystalline material might appear transparent (particle size less than 500 nm) or opaque and white (particle size up to a few micrometers) depending on its crystal structure and particle size.
The monomer bis(2-hydroxyethyl) terephthalate can be synthesized by the esterification reaction between terephthalic acid and ethylene glycol with water as a byproduct, or by transesterification reaction between ethylene glycol and dimethyl terephthalate (DMT) with methanol as a byproduct. Polymerization is through a polycondensation reaction of the monomers (done immediately after esterification/transesterification) with water as the byproduct
PET (polyethylene terephthalate) is USEFUL, DURABLE; RECYCLABLE It is a type of durable plastic found in many food grade and non-food grade PET packaging products. PET is highly desirable as a packaging product because of its versatility, lightweight and strength, thus making it a very popular material among manufacturers of many different kinds of products.
PET is also highly recyclable, provided it goes through the correct recycling process to remove dirt, contaminants and other materials that may compromise the quality of the final product.