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PU tube is also TPU tube, which is a kind of transparent pneumatic hose obtained by selecting polyurethane granules and improving the secret formula and extruding at high temperature to vulcanize rubber. The model specifications are 10*6.5, 12*8, 4*6. Polyurethane is made by addition polymerization of organic chemical diisocyanate or polyacrylate and dimethyl or polymethyl chemical substances. The key is used in the automation technology pneumatic control valve, which is used to deliver air compression to manipulate the cylinder fitness exercise and to achieve all system software work. Its characteristic is that the tube body is soft and has good acid and alkali resistance. When used in an air compressor, it is very likely that various vegetable oils may enter the tube body or surface and be stained. After testing its acid and alkali resistance It is stronger than the oil-resistant rubber tube of nitrile rubber material.