Hayward O-Ring Materials

Hayward ball valves are available with o-rings in two primary materials: EPDMand FPM/FKM (Fluorocarbon). The correct choice depends on the chemicals, temperature, and operating conditions of your application.

Quick O-Ring Material Comparison

Material	Max Continuous Temp	Best For	Not Recommended For
EPDM	300°F (149°C)	Water, steam, dilute acids, dilute alkalis, alcohols	Petroleum oils, hydrocarbon solvents, diester lubricants
FPM / FKM (Fluorocarbon)	400°F (204°C)	Petroleum oils, many chemicals, high temperatures	Some polar solvents, hot water/steam (check compatibility)

EPDM (Ethylene Propylene Diene Monomer)

EPDM rubber is an elastomer prepared from ethylene and propylene compounds. It has been used continuously to a temperature of 300°F. The material is recommended for water, steam, dilute acids, dilute alkalis, and alcohols. EPDM is not recommended for petroleum oils or diester lubricants.

FPM or FKM (Fluorocarbon Rubber)

The fluorocarbon elastomers have a maximum service temperature of 400°F. Fluorocarbon materials are recommended for petroleum oils, many chemicals, and high-temperature applications. They offer excellent resistance to a wide range of aggressive fluids.

Need Help Choosing?

If you are unsure which o-ring material is most compatible with your application, please send us an inquiry. We can review your media, temperature, and pressure requirements and recommend the best option.