NBR, Nitrile O-Rings & Seals

Nitrile rubber is the most commonly used elastomer for O-Rings and other seals. Also known as Buna N, Nitrile, NBR. NBR O-Rings have a high tensile strength and good resistance to scratches, cracks and pressure deformation. The material and production costs of nitrile rubber are low compared to other elastomers.

The recommended temperature range of nitrile rubber is between -40 and 108 °C. Special low temperature Nitrile rubber types can handle temperatures of -54 °C. Special high temperature Nitrile rubber types can be used up to 135 °C. It is important to know that nitrile rubber is poorly resistant to ozone, sunlight and weather influences. The Nitrile seals must not be stored in the vicinity of ozone-generating electric motors or equipment.

Typical products for nitrile rubber are: O-rings, hoses, gaskets, diaphragms and hydraulic hoses. Due to its oil and fuel resistance, NBR O-rings are commonly used in automotive, marine and oil and gas applications.

NewDealSeals supplies Nitrile O-Rings & NBR seals in any dimension and in various compounds. Do you need expertise and quality service? Call +31(0)226362233 or mail us info@newdealseals.com.

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Black nitrile o-rings and NBR seals

Specifications NBR

  • Temperature range:
    -40 to 108 °C
  • Shore:
    30 / 40 / 50 / 60 / 70 / 80 / 90
  • Relative Cost:
    Rating symbol: Very high
  • Tradenames:
    Krynac® (LANXESS), Nipol® (Zeon Chemicals)
  • Common names:
    Nitrile, Buna-N, NBR
  • Colours:
    Black. Other colors on request.

NBR Characteristics

Resistance NBR
Abrasion Rating symbol: Good
Acid Rating symbol: Fair
Base Rating symbol: Good
Chemical Rating symbol: Fair to Good
Cold Rating symbol: Good
Flame Rating symbol: Poor
Heat Rating symbol: Good
Resistance NBR
Oil Rating symbol: Excellent
Ozon Rating symbol: Poor
Set Rating symbol: Good to Excellent
Steam Rating symbol: Poor
Tear Rating symbol: Fair to Good
Water Rating symbol: Good
Weather Rating symbol: Fair
Propertys NBR
Dynamic properties Rating symbol: Good to Excellent
Electrical properties Rating symbol: Fair
Gas impermeability Rating symbol: Good
Tensile strength Rating symbol: Good to Excellent

NBR performs well in

  • Petroleum oils & fuels
  • Silicone oils & greases
  • Ethylene glycol
  • Dilute acids
  • Water

NBR does not perform well in

  • Aromatic hydrocarbons (benzene, toluene, xylene)
  • Automotive brake fluid
  • Halogen derivatives (carbon tetrachloride, trichloroethylene)
  • Ketones (MEK, acetone)
  • Phosphate ester hydraulic fluids (Skydrol®, Pydraul®)
  • Strong acids

Typical NBR Applications

  1. Automotive, marine and aircraft fuel systems
  2. Shaft seals in oil applications
  3. Low temperature applications
  4. Hydraulic hoses
  5. Nitrile tubing