PEEK is a special engineering plastic with excellent heat resistance, chemical corrosion resistance, wear resistance and good mechanical strength. The high wear resistance of PEEK ensures that the sleeve surface can remain smooth even in harsh working environments, such as high temperature, high humidity, and highly corrosive media, reducing the friction coefficient, reducing energy consumption, and improving overall efficiency. Compared with traditional metal sleeves, PEEK-processed sleeves can easily cope with the erosion of various strong acids, strong alkalis and organic solvents, and maintain a long-term stable working state.