PU, polyurethane fiber (spandex for short), excellent performance of spandex: outstanding high resilience. The high resilience of spandex is incomparable to all elastic fibers at present. Its elongation at break is more than 400%, and the highest can reach 800%. Even at 300% stretching, the rebound recovery rate is still above 95%. Excellent tensile strength and tear strength; Strong weather resistance and ultraviolet radiation resistance; Resistant to chemicals and washing; Good affinity with dyes.

Spandex has been widely used in textiles, and it is a new textile material with high added value. There are four main forms of its use: bare yarn, core-spun yarn, covered yarn and twisted yarn. Such as stockings, swimsuits, dance clothes, lycra (pure cotton coated spandex yarn), clothing and so on. In traditional textiles, adding spandex below 10% can greatly improve the grade of traditional fabrics and present a soft, comfortable and elegant style.

Polyurethane material is the abbreviation of polyurethane, which is called polyurethane in English and is a kind of polymer material. Polyurethane is a new type of organic polymer material, known as "the fifth largest plastic", and is widely used in many fields of national economy because of its excellent properties. The product application fields involve light industry, chemical industry, electronics, textiles, medical treatment, architecture, building materials, automobiles, national defense, aerospace, aviation and so on.

PE, polyester fiber, commonly known as "polyester". PET fiber is a kind of synthetic fiber obtained by spinning polyester condensed from organic dibasic acid and diol. Invented in 194 1, it is the most variety of synthetic fibers at present.