Materials
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Butyl (IIR)
Butyl rubber (isobutylene-isoprene rubber or IIR) has a very low permeability rate
and good electrical properties, but poor short-term rebound.
Chloroprene (CR)
Also known by the tradename Neoprene®, polychloroprene was the first synthetic rubber and exhibits generally good ozone, aging, and chemical resistance.
Ethylene Acrylic (AEM)
Ethylene acrylate is a mixed polymer of ethylene, methyl acrylate and a small amount of carboxylated cure-site monomer.
Ethylene Propylene (EPDM)
EPDM is a terpolymer of ethylene, propylene, and a diene third monomer used for cross-linking.
Fluorocarbon (FKM, FPM)
Fluorocarbon (FKM) has excellent resistance to high temperature and a broad range of chemicals. Permeation resistance and compression set are excellent.
Fluorosilicone (FVMQ)
Fluorosilicone is a silicone polymer chains with fluorinated side-chains for improved oil and fuel resistance. The mechanical and physical properties are very similar to those of silicone.
Hydrogenated Nitrile (HNBR)
Hydrogenated nitrile was developed as an air-resistant variant of nitrile rubber.
Perfluoroelastomer (FFKM)
Perfluoroelastomer is a rubber version of PTFE.
Polyacrylate (ACM)
ACM (acrylic rubber) has good resistance to mineral oil, oxygen and ozone. The water compatibility and cold flexibility of ACM are considerably worse than with NBR.
POLYURETHANE (AU, EU)
Polyurethane elastomers have excellent wear resistance, high tensile strength and high elasticity in comparison with any other elastomers. Permeability is good and comparable with butyl.
Silicone (VMQ)
Silicones possess good insulating properties and tends to be physiologically neutral. However, silicone elastomers have relatively low tensile strength, poor tear and wear resistance.
PTFE
PTFE (Polytetrafluoroethylene) has outstanding chemical resistance, a very low coefficient of friction, and excellent thermal stability.
Acrylonitrile-Butadiene (NBR)
Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene terpolymer. Polymers with higher ACN content exhibit less swell in gasoline and aromatic solvents, while lower ACN polymers exhibit better compression set and low temperature flexibility. Polymer is also called Buna-N.
View the Parker O-Ring Material Offering Guide
