Polyester fiber (polyester), commonly known as polyester. It is a synthetic fiber among chemical fibers. The synthetic fiber manufacturing industry is the largest and most branched sub-industry in the chemical fiber industry. In addition to polyester, its products also include acrylic, nylon, spandex, etc.

The English noun for polyester is terylene, which is mostly used to describe gray cloth, fabrics and clothing. For example: polyester-cotton gray cloth is called T/c cloth. Polyester is used for a more precise terminology of chemical raw materials. Generally, products made of polyester are called chemical fiber gray cloth or fabric.