PET is a polymer, also called thermoplastic, that is produced through a process of continuous polymerization being melted.

Synonyms and Trade Names. Amilar; Daiya foil; Dowlex; Ethylene terephthalate polymer; Fiber V; Hostadur; Hostaphan; Lavsan; Lawsonite; Melinex; Mersilene; Nitron lavsan; Poly(oxy-1,2-ethanediyloxycarbonyl-1,4phenylenecarbonyl); Polyethylene glycol terephthalate; Terephtahlic acid-ethylene glycol polyester; thermoplastic, Polyester PET .

Composition. A polyester of terephthalic acid and ethylene glycol can be obtained by the poly= condensation of dimethyl terephthalate (q.v.) with ethylene glycol, and also terephthalic acid with ethylene glycol or ethylene oxide.

Properties. A white or light-cream material. Noted for high heat resistance and chemical stability. When melt-blown, it provides a good barrier for both flavors and hydrocarbons (fat). It is not transparent. PET is resistant to acids, bases, some solvents, and oils and fats. It is difficult to mold. The melting point of unmodified PET is below boiling. Monolayer films will hold a crease, are heat sealable, and transparent. Dens. 1.332²⁰. M. p. 255 to 265°C. n²⁵ =1.574. Insoluble in water.

Applications. PET is used for high-impact resistant containers. It is used for packaging of soda, mouthwash, pourable dressings, edible oils, and peanut butter. It is used for cereal box liners, soda bottles, boil-in-the-bag pouches, and microwave food trays. Modified PETS can be heated in a microwave or in a conventional oven at 180°C for 30 minutes. There has been a moderate amount of concern that additives from these trays may migrate into foods, particularly if the trays are reused in a microwave oven. PET is also used in the production of different bottles, fibers, films for food packaging, and different articles. Lavsan fabric is used in the dairy industry for filtering. Used in medicine for plastic vessels and for implantation.

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