The full name is polyurethane. A polymer compound. In 1937, it was made by O. Bayer and others. There are two types of polyurethane: polyester and polyether. They can be made into polyurethane plastics (mainly foam plastics), polyurethane fibers (known as spandex in China), polyurethane rubber and elastomers.
Soft polyurethane (PU) mainly has a thermoplastic linear structure, which has better stability, chemical resistance, resilience and mechanical properties than PVC foaming materials, and has less compression deformation. Good heat insulation, sound insulation, shock resistance, and anti-virus performance. Therefore, it is used as packaging, sound insulation and filtering materials. Rigid PU plastic is light, soundproof, superior in heat insulation, chemical resistant, good electrical properties, easy to process, and low water absorption. It is mainly used in construction, automotive, aerospace, and thermal insulation materials. Polyurethane elastomer performance is between plastic and rubber, oil resistance, abrasion resistance, low temperature resistance, aging resistance, high hardness and elasticity. Mainly used in shoe industry and medical industry. Polyurethane can also be made into adhesives, coatings, synthetic leather, and the like.