NBR O-rings

NBR O-rings are one of the most widely used and cost-effective sealing solutions due to their excellent resistance to petroleum-based oils and fuels, good mechanical properties, and broad temperature range for general industrial applications.
Key Features and Properties
Material: NBR (Nitrile Butadiene Rubber), also known as Buna-N or Nitrile, is a synthetic elastomer produced by the copolymerization of butadiene and acrylonitrile.
Temperature Range: Typically effective from -30°C to +120°C (-22°F to +248°F), though special compounds can extend the low-temperature range to -50°C or the high end to +135°C.
Mechanical Properties: Offers strong tensile strength, high abrasion resistance, and good resistance to compression set, making it suitable for both static and light dynamic applications.
Hardness: Available in various hardness levels, with 70 Shore A being the standard and 90 Shore A used for high-pressure applications where maximum rigidity is needed.
Chemical Compatibility
Resistant To:
Mineral oils and greases
Petroleum-based oils, fuels (gasoline, diesel, kerosene), and silicone greases/oils
Hydraulic fluids (HFA, HFB, HFC types)
Aliphatic hydrocarbons (propane, butane)
Water (up to 80°C or 176°F) and ethylene glycol-based fluids
Diluted acids and alkalis
Not Recommended For Use With:
Ozone, UV radiation, and outdoor weathering/sunlight
Aromatic hydrocarbons (benzene, toluene, xylene)
Strong acids, ketones (acetone, MEK), esters, and aldehydes
Chlorinated solvents (e.g., chloroform, trichloroethylene)
Phosphate ester hydraulic fluids (Skydrol)
Typical Applications
Due to their excellent resistance to oils and fuels, NBR O-rings are widely used in a variety of industries:
Hydraulic and Pneumatic Systems: Used in cylinders, valves, and pumps to prevent fluid or gas leakage.
Automotive Industry: Essential for seals in engines, fuel systems (hoses, gaskets), and gearboxes.
HVAC Systems: Selected for their resistance to oils, coolants, and refrigerants.
Industrial Machinery: Applied in pumps and general machinery where contact with oils and grease is frequent.
Food and Drinking Water: Special FDA and NSF61 certified compounds are available for use in applications with food contact.