O-Rings - FEPM, 75 Shore A

O-rings are circular sealing rings with a round cross-section. When an O-ring is fitted into a groove and compressed between two surfaces, it forms a seal that prevents the escape of liquids or gases. O-rings are suitable for both static and dynamic applications.

These O-rings are made from FEPM, a fluoroelastomer based on a copolymer of tetrafluoroethylene and propylene. FEPM combines excellent heat resistance with outstanding resistance to steam, hot water, acids and bases, which makes it suitable for many applications where standard FKM cannot be used. It also has good resistance to ozone and weathering, and good electrical insulation properties. At 75 Shore A, the material offers a good balance of flexibility and resistance to extrusion.

Chemical Compatibility

FEPM is recommended for use with steam and hot water, acids and bases, amine-based corrosion inhibitors, brake fluids, hydraulic fluids, phosphate esters, petroleum oils, alcohols and hydrogen sulphide (H₂S).

Limitations

FEPM is not recommended for use with aromatic fuels, toluene, ketones, ethers or chlorinated hydrocarbons. FEPM has limited flexibility at low temperatures, so it is not recommended for low-temperature applications. It also has a higher compression set than many other elastomers.

Applications

These O-rings are suitable for oil and gas equipment, chemical processing, steam and hot water systems, and cooling systems.

Installation Guidance

Make sure that the groove and mating surfaces are clean and free from burrs. For high-pressure applications or larger clearance gaps, a harder grade or back-up rings may be required to prevent extrusion. Apply a thin film of compatible lubricant before fitting, and do not stretch or roll the O-ring over sharp edges or threads.

All dimensions are nominal. The information provided by AH Design Components Ltd is for reference only and is not a manufacturing specification. Please confirm that the product is suitable for your application before use.