A thermoplastic polyester resin made from ethylene glycol and terephthalic acid; melts at 265°C; used to make films or fibers. Abbreviated PET.
a polyester produced by polycondensation of terephthalic acid or its dimethyl ether with ethylene glycol.
Polyethylene terephthalate is a white, odorless solid with molecular weight 20,000 40,000; the maximum crystallinity of unoriented polyethylene terephthalate is 40 45 percent, and of the oriented variety, 60 65 percent; density, 1.38 1.40 g/cm 3 (20 C); melting point, 255 -265 C; softening point, 245 -248 C.
Polyethylene terephthalate is insoluble in water and organic solvents and is relatively resistant to dilute acid solutions, such as 70-percent H2 SO4. 5-percent HCl, or 30-percent CH3 COOH, and to cold solutions of alkalies and bleaching agents, for example, sodium hypochlorite or hydrogen peroxide. It hydrolyzes under the action of alkaline solutions at temperatures above 100 C and, at 200 C, even under the action of water.
Polyethylene terephthalate has high strength and resistance to abrasion and repeated tensile and bending stress, low hygro-scopicity (moisture content, 0.4 0.5 at 20 C and 60 percent relative humidity), and a working temperature range of 60 to 170 C. It is a good dielectric (loss tangent, 0.013 0.015 at 1 megahertz) and is relatively resistant to light, X rays, and -rays.
Polyethylene terephthalate is processed mainly into fibers and films, and also into various molded products, such as radio components and chemical equipment. World production of polyethylene terephthalate in 1973 was about 3.5 million tons.
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In our polyethylene terphthalate (‘PET’) product segment, our injection stretch blow molding manufacturing platform has been a success in attracting numerous existing and new customers.
These components are primarily made of polyethylene terphthalate (PETE) and polystyrene, which are plastics that are widely recycled today.
In 1993, consumers nationwide recycled 450 million pounds of PET plastic — polyethylene terphthalate — a 23 percent increase since 1992, according to an independent national survey.