Fluorine lined butterfly valve

Butterfly valve seal material PTFE and EPDM difference

2025-07-12

This article compares the performance differences and application scenarios of two key sealing materials for butterfly valves, PTFE (polytetrafluoroethylene) and EPDM (ethylene propylene diene rubber). PTFE is known for its excellent chemical stability, corrosion resistance (acid and alkali/solvent resistance) and low coefficient of friction, and is widely used in the chemical, petroleum, pharmaceutical and other industries, but its mechanical strength is weak and caution is required at high temperatures. epdm, on the other hand, possesses excellent weatherability ( Aging, ozone, high temperature, water vapor) and insulation, especially suitable for outdoor piping, waterproofing and electrical applications, but its chemical stability is relatively weak compared to PTFE. When choosing, it is necessary to weigh the characteristics of the two according to the specific working conditions (fluid characteristics, environmental conditions) to optimize the performance and life of the butterfly valve.