Polyurethane cots have excellent physical properties, no hardening and aging after long-term use, good tear resistance, resilience and excellent wear resistance, so they are long in service life, easy to store and will not affect the use effect after long-term storage; Able to withstand high pressure, high speed and high humidity production environment. Experiments show that the tensile strength and wear resistance of polyurethane cots are 3 times and 5 times that of natural rubber cots, respectively. Compression permanent deformation and good resilience; The service life of polyurethane cots is more than 3 times that of ordinary cots. Cot is a rolled product with metal or other materials as the core and rubber as the sleeve. According to the purpose, it can be divided into paper-making cots, printing cots, printing cots, husking cots, metallurgical cots and mimeographed cots. According to the surface morphology, it can be divided into: flat roller pattern cots; EPDM cots can be divided into butyl cots, nitrile rubber rollers, polyurethane cots and silicone rubber cots according to materials. Special for pump valve (PU); Corrosion-resistant, wear-resistant, water-resistant and methanol-resistant valve linings, seals, couplings, diaphragms, muffling layers, floating balls and other products can be customized to withstand low temperature (-35℃).