EPDM O-Rings

About

Property FKM (Viton®-type fluoroelastomer) EPDM (Ethylene Propylene Diene Monomer) Temperature range Typically -20°C to +200°C (some grades higher) Typically -50°C to +150°C Oils & fuels Excellent Poor Hydraulic fluids (petroleum-based) Excellent Poor Water & steam Fair to poor (especially hot water/steam) Excellent Weathering & UV Excellent Excellent Ozone resistance Excellent Excellent Acids & chemicals Good to excellent for many chemicals Excellent for many water-based chemicals Cost Higher Lower Choose Viton if: The seal will contact oils, fuels, diesel, gasoline, lubricants, or petroleum-based hydraulic fluids. You need high-temperature resistance. It's used in automotive, aerospace, chemical processing, or industrial equipment. Choose EPDM if: The seal will contact water, hot water, steam, glycol coolants, or many cleaning chemicals. It's used in plumbing, potable water systems, HVAC, or outdoor applications. You need good low-temperature flexibility.