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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 explosive decompression resistance.
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Butyl IIR
- Very low gas permeability.
- Suitable for vacuum and high pressure applications.
- Must not be used with mineral oils.
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Chloroprene CR
- General purpose elastomer, usually known as neoprene.
- Suitable for use with many media.
- Largely unaffected by sunlight and atmospheric ageing.
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Chlorosulphonated polyethylene CSM
- Hypalon® is a popular example.
- Excellent resistance to weathering.
- Gives good service with many media on static sealing duties.
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Dyneon® FPM/FKM
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Elast-O-Lion® HNBR
- Our range of high-performance hydrogenated nitrile compounds.
- Excellent mechanical and chemical properties.
- Four grades are explosive decompression resistant for oilfield duties.
- Stocked 'O' ring grades: Elast-O-Lion® 101, 180 & 985.
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Epichlorohydrin ECO
- Good resistance to mineral oils, fuels and ozone.
- 'O' ring sealing applications limited by corrosive properties and poor compression set resistance.
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Ethylene-propylene EPM/EPDM
- Excellent resistance to weathering, ozone, water and steam.
- Our EP62 range is approved for potable water duties.
- Stocked 'O' ring grade: EP18/H/75.
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Fluolion® PTFE
- Polytetrafluoroethylene has outstanding resistance to virtually all media.
- Excellent material for 'O' ring back-up rings.
- Flow characteristics limit its use for 'O' ring seals.
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Fluoroelastomers FPM/FKM
- Viton,® Tecnoflon® and Dyneon® are well-known compounds.
- Suitable for severe chemical conditions and high temperatures.
- FR25/90, FR58/90 & 98 grades are explosive decompression resistant with FR25/90 & FR58/90 qualified to Norsok M-710.
- Stocked 'O' ring grades: FR10/80, FR25/90, FR58/90.
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Fluorosilicone FVMQ
- Widely used for static seals in aerospace fuel systems.
- Resistant to hydrocarbon oils, petroleum fuels and mineral-based hydraulic fluids.
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Hydrogenated nitrile HNBR
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Hypalon® CSM
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Kalrez® FFKM
- Perfluoroelastomer compounds with almost universal chemical resistance.
- Specific grades operate at up to 315°C.
- James Walker is authorised UK distributor for Kalrez® items used for fluid sealing and handling duties, manufactured by DuPont Performance Elastomers.
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Natural 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.
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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 food applications.
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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.
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Silicone VMQ
- Good resistance to heat, weathering and compression set.
- Excellent electrical properties.
- Sealing duties limited by high gas permeability, low tensile strength and poor resistance to tear and abrasion.
- Stocked 'O' ring grade: SIL 80/2.
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Tecnoflon® FPM/FKM
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Viton® FPM/FKM
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We supply our 'O' rings in over 100 general and high-specification grades of elastomer (and other materials) including ranges of low-temperature and explosive decompression (ED) resistant materials.
