PET is a milky white or light yellow, highly crystalline polymer with a glossy finish.In relatively wide temperature range with excellent physical and mechanical properties, long-term use of up to 120 ℃ temperature, excellent electrical insulation, even under the high temperature and high frequency, its electric performance is still good, creep resistance, fatigue resistance, frictional resistance, dimensional stability are good, but the corona resistance is poor.PET is divided into fiber - grade polyester chip and non - fiber grade polyester chip.It is used to manufacture polyester staple fiber and polyester filament yarn, which is the raw material for processing fiber and related products of polyester fiber enterprises.Polyester is the largest production in chemical fiber.(2) the fiber polyester film and bottle, and other purposes, are widely used in packaging industry, electronic appliances, medical and health care, construction, automotive and other fields, including packaging is one of the largest non polyester fiber application market, is also the fastest growth in PET.