Polyester (Greek: Polyester) (PET or PES codes) are a type of polymer that has ester groups. As a special material, it is usually called polyethylene terephthalate or PET. Polyesters contain chemicals from natural reactions such as those found in plant bark catechins, as well as step-by-step polymerization syntheses such as polybutyrate. Natural polyesters and some synthetic polyesters are biodegradable, but this property does not include most synthesized polyesters. Depending on the structure of the polyesters, they may be thermoplastic or thermoset. There are also polyesters that can be dissolved in hardeners, but most polyesters are thermoplastic.

Polyesters are mostly used in the structure of synthetic fibers. Synthetic fibers from dimethyl terephthalate (DMT) or terephthalic acid and ethylene glycol (standard polyester fibers or commercial type of terylene ٰ terylene) or from 1 and 4 in methyl cyclohexane (vestan) or kodel, which is produced by smelting be.

Mass production of these fibers has started since 1945, and today, with a global production of 21 million tons in 2002, this fiber has the largest share of production among fibers.

182/5000
Characteristics: Density 1.38 g / cm3, High tear strength, Good elasticity, Abrasion resistance, Very good optical stability, High resistance to mineral and organic acids (decomposes in concentrated sulfuric acid)
Polyester fibers do not wrinkle and do not shrink, they are easy to wash and dry quickly. Available supplies: filament yarns, cross-sectional fibers (miscible with wool, cotton, and carpets), bundles of fibers, padding fibers, spunbond fabrics, and intermediate halo fibers : Hollow fiber) and two-component fibers