Differences Between PTFE and EPDM Sealing Materials in Butterfly Valve

This article compares the performance differences and application scenarios of two key sealing materials used in butterfly valves: PTFE (polytetrafluoroethylene) and EPDM (ethylene propylene diene monomer). PTFE is renowned for its exceptional chemical stability, corrosion resistance (resistance to acids, alkalis, and solvents), and low coefficient of friction, and is widely used in the chemical, petroleum, and pharmaceutical industries; however, it has relatively low mechanical strength and requires caution when used at high temperatures. EPDM, on the other hand, offers excellent weather resistance (resistance to aging, ozone, high temperatures, and moisture) and insulation properties, making it particularly suitable for outdoor piping, waterproofing, and electrical applications; however, its chemical stability is relatively weaker than that of PTFE. When selecting a material, the characteristics of both must be weighed against specific operating conditions (fluid properties and environmental conditions) to optimize the performance and service life of the butterfly valve.