Polyester fiber, commonly known as "Dacron." It is a synthetic fiber derived from the polymerization of organic dicarboxylic acids and diols, known as PET fiber, and belongs to a class of high molecular compounds. Invented in 1941, it is one of the major types of synthetic fibers. The advantages of polyester fiber include excellent wrinkle resistance and shape retention, as well as high strength and elasticity recovery capabilities. It is durable, wrinkle-free, and non-static.

Polyester fibers possess a range of excellent properties, such as high tensile strength and modulus of elasticity, moderate resilience, superior heat-setting effects, and good heat and light resistance. The melting point of polyester fibers is around 255°C, with a glass transition temperature of approximately 70°C. They maintain shape stability under a wide range of applications, offer washable wearability, and also exhibit resistance to organic solvents, soaps, detergents, bleaches, and oxidizers, as well as good corrosion resistance to weak acids and alkalis. This makes them suitable for both wide-spectrum apparel and industrial applications. The rapid development of the petroleum industry has also provided a more abundant and cost-effective raw material supply for polyester fiber production. With advancements in chemical, mechanical, and electronic self-control technologies in recent years, the production process of raw materials, fiber formation, and processing has gradually become shortening, continuous, automated, and high-speed. Polyester fibers have become a synthetic fiber variety with rapid development and high yields. In 2010, the global production of polyester fibers reached 37.3 million tons, accounting for 74% of the total synthetic fiber volume in the world.