The lining materials used in plastic centrifugal pumps are usually selected based on their chemical resistance, as well as their ability to withstand the mechanical stresses of the pumping operation. Some common lining materials used in plastic centrifugal pumps include polyvinyl chloride (PVC), polypropylene (PP), polytetrafluoroethylene (PTFE), and ethylene chlorotrifluoroethylene (ECTFE).

        PVC linings are a cost-effective option for pumps that handle low to moderate levels of corrosive fluids. They offer good chemical resistance to a wide range of chemicals and are generally suitable for applications involving temperatures up to 140°F.

        PP linings are often used in pumps that handle corrosive fluids at higher temperatures, as they offer excellent chemical resistance and can withstand temperatures up to 212°F. They are also resistant to most organic solvents and acids.

        PTFE linings are used in pumps that handle highly corrosive fluids, such as acids and caustics, as they provide excellent chemical resistance and can withstand temperatures up to 500°F. They are also known for their low coefficient of friction, making them suitable for applications where the pumped fluid is abrasive.

        ECTFE linings are used in pumps that handle aggressive chemicals at elevated temperatures, as they offer excellent chemical resistance and can withstand temperatures up to 300°F. They also have a low coefficient of friction, making them suitable for abrasive applications.

        The main difference between these lining materials is their specific properties and performance characteristics. PVC is a low-cost option with moderate chemical resistance, while PP offers better chemical resistance at higher temperatures. PTFE is an excellent choice for highly corrosive fluids and abrasive applications, while ECTFE is a good choice for aggressive chemicals at elevated temperatures. The selection of the lining material should be based on the specific requirements of the pumping application.