Not everything can be replaced, asbestos, graphite, rubber, nylon, etc. can replace polytetrafluoroethylene seals. If comprehensive performance such as corrosion resistance and high temperature resistance is required, there are also materials made of polytetrafluoroethylene, such as perfluoroalkoxy, but the temperature resistance is not as high as polytetrafluoroethylene. FEP (F46), short for polytetrafluoroethylene, is a material similar to polytetrafluoroethylene (F4). It is mostly a fluoroplastic, resistant to high and low temperatures, self-lubricating, and resistant to chemical corrosion. Perfluoroethylene propylene can also be produced by injection molding, which is easy to recycle and has superior comprehensive performance. However, its price is much higher than polytetrafluoroethylene (F4). If you feel that the performance of polytetrafluoroethylene is not enough, you can consider filling it with polytetrafluoroethylene. Some reinforcing materials such as carbon fiber, copper powder, and polystyrene can be filled in polytetrafluoroethylene to improve its performance and lifespan.