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

Chemours Co. Viton^® (FKM)

• See Fluoroelastomers

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

DuPont^TM 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

Dyneon^TM (FKM)

• See Fluoroelastomers

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 Dyneon^TM 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

Hydrogenated nitrile (HNBR)

• See Elast-O-Lion^®

Kalrez^® 0040 perfluoroelastomer

Specifically designed for low-temperature applications

Kalrez^® 0090 RGD resistant perfluoroelastomer

Excellent all-around performance in harsh oil and gas environments

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

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

Tecnoflon^® (FKM)

• See Fluoroelastomers