O-rings
Materials
We supply our O-rings in over 100 general and high-specification grades of elastomer (and other materials) including ranges of low-temperature and rapid gas decompression (RGD) resistant materials.
Aflas® (FEPM)
- Resists oils, lubricants and some fuels
- Suitable for sour (H2S) gas, amines or high temperature water/steam
- Our AF69/90 grade is formulated for rapid gas decompression resistance
Butyl (IIR)
- Very low gas permeability
- Suitable for vacuum and high pressure applications
- Must not be used with mineral oils
Chloroprene (CR)
- General purpose elastomer, usually known as neoprene
- Suitable for use with many media
- Largely unaffected by sunlight and atmospheric ageing
Chlorosulphonyl polyethylene (CSM)
- Excellent resistance to weathering
- Gives good service with many media on static sealing duties
- Suited mainly to static sealing duties

DuPontTM Kalrez® (FFKM)
- Perfluoroelastomer compounds with almost universal chemical resistance
- Specific grades operate at up to 325°C
- James Walker is authorised distributor for DuPont Kalrez items used for fluid sealing and handling duties
Elast-O-Lion® (HNBR)
- Our range of high-performance hydrogenated nitrile compounds
- Excellent mechanical and chemical properties
- Three RGD-resistant grades are recommended for oilfield duties
- Stocked O-ring grades: Elast-O-Lion® 101, 180 and 985
Epichlorohydrin (ECO)
- Good resistance to mineral oils, fuels and ozone
- Sealing applications limited by corrosive properties and poor compression set resistance
Ethylene-propylene (EPM/EPDM)
- Excellent resistance to weathering, ozone, water and steam
- O-rings in EP62 range are approved for potable water duties
- Stocked O-ring grade: EP18/H/75
Fluoroelastomers (FKM)
- Viton®, Tecnoflon® and DyneonTM are well-known compounds
- Suitable for severe chemical conditions and high temperatures
- FR25/90, FR58/90 grades are RGD resistant and qualified to Norsok M-710
- Stocked O-ring grades: FR10/80, FR25/90, FR58/90
Fluorosilicone (FVMQ)
- Widely used for static seals in aerospace fuel systems
- Resistant to hydrocarbon oils, petroleum fuels and mineral-based hydraulic fluids

Kalrez® 0090 RGD resistant perfluoroelastomer
Excellent all-around performance in harsh oil and gas environments
More InfoNatural rubber (NR)
- High strength with good abrasion resistance
- Suitable for use with hot/cold water, ammonia, ethylene glycol, dilute acids and alkalis
- Synthetic rubbers have superior resistance to heat, weathering and oils
Nitrile (NBR)
- We have a vast range of compounds based on various acrylonitrile/butadiene ratios
- Stocked O-ring grade: PB80, for use with mineral oils - especially hydraulic fluids - water and some solvents
- Our Proteus grade is generally suitable for aqueous food applications

O-rings for oil and gas duties
Vast range in general and RGD-resistant materials
- Precision moulded in over 100 elastomer grades
- International, national and industry standard rings
- Many thousands of different types and sizes stocked
- All popular sizes ex-stock in RGD-resistant materials
Polyurethane (AU/EU)
- Good mechanical properties - often used for drive transmissions
- Excellent resistance to weathering
- Good resistance to hydrocarbon fuels and mineral oils
- Sealing duties limited by stress relaxation above +50°C
Silicone (VMQ)
- Good resistance to heat, weathering and compression set
- Excellent electrical resistance
- Sealing duties limited by high gas permeability, low tensile strength and poor resistance to tear and abrasion
- Stocked O-ring grade: SIL 80/2