Material Selection Guide
This section provides a brief review of the various elastomers currently available for use in Parker's O-rings and custom elastomeric seals.
Service recommendations mentioned in this section are necessarily abbreviated. For more comprehensive and specific information on this important subject, see the Fluid Compatibility Tables in Section VII of the hard print or pdf version of the Parker O-Ring Handbook.
Rubber terms described in this section are further explained in the eHandbook glossary.
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Acrylonitrile-Butadiene (NBR)
Nitrile rubber (NBR) is the general term for acrylonitrile butadiene copolymer.
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Carboxylated Nitrile (XNBR)
Carboxylated nitrile (XNBR) is a special type of nitrile polymer that exhibits enhanced tear and abrasion resistance.
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Ethylene Propylene Rubber (EPR, EPDM)
EPR copolymer ethylene propylene and ethylene-propylenediene rubber (EPDM) terpolymer are particularly useful when sealing phosphate-ester hydraulic fluids and in brake systems that use fluids having a glycol base.
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Silicone (Q, MQ, VMQ, PVMQ)
Silicones have good ozone and weather resistance as well as good insulating and physiologically neutral properties.
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Hydrogenated Nitrile (HNBR, HSN)
Hydrogenated Nitrile (HNBR, HSN) has superior mechanical characteristics, particularly high strength, that helps reduce extrusion and wear.
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Fluorocarbon (FKM)
Fluorocarbon (FKM) has excellent resistance to high temperatures, ozone, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals.
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Fluorosilicone (FVMQ)
FVMQ has similar mechanical and physical properties to VMQ but offers improved fuel and mineral oil resistance.
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Tetrafluoroethylene-Propylene (AFLAS)
Tetrafluoroethylene-propylene (AFLAS®) provides chemical resistance that is excellent across a wide range of aggressive media.
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Perfluoroelastomer (FFKM)
Perfluoroelastomers (FFKM) currently offer the highest operating temperature range, the most comprehensive chemical compatibility, and the lowest off-gassing and extractable levels of any rubber material.
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Chloroprene Rubber (CR)
Chloroprene was the first synthetic rubber developed commercially and exhibits generally good ozone, aging and chemical resistance. It has good mechanical properties over a wide temperature range.
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Butyl Rubber (IIR)
Butyl (isobutylene, isoprene rubber, IIR) has a very low permeability rate and good electrical properties.
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Ethylene Acrylate (AEM, Vamac)
Ethylene acrylate is a terpolymer of ethylene and methyl acrylate with the addition of a small amount of carboxylated curing monomer
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Polyacrylate (ACM)
Polyacrylate (ACM) has good resistance to mineral oil, oxygen, and ozone.
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Polyurethane (AU, EU)
Polyurethane elastomers, as a class, have excellent wear resistance, high tensile strength and high elasticity in comparison with any other elastomers.
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O-Ring & Engineered Seals
2360 Palumbo Drive
Lexington, KY 40509
Ph: 859-269-2351
Fax: 859-335-5128
oesmailbox@parker.com www.parkerorings.com
