NBR O-rings < 40 Shore A

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The origin of NBR

Nitrile-butadiene rubber (NBR) was developed by the chemical company ‘I.G. Farbenindusty’ from Germany between WWI and WWII. At first the material was called Buna-N® and was later renamed to Perbunan®. The material first came to market in the 30s and is nowadays the most used elastomer for standard seals like O-rings and other seals.

What is NBR?

NBR is an elastomer, which is a synthetic polymer obtained by the copolymerization of acrylonitrile and 1,3-butadiene. The characteristics are partly determined by the amount of acrylonitrile in the material and this varies from 18 to 50 percent. As the acrylonitrile increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases and the rubber can become brittle.

What is NBR used for?

  • Seals
  • O-rings
  • Gaskets
  • Pipe and Cable Covers

The advantages of NBR

  • Resistant against oils, fats, hydrocarbons, diluted acids
  • Has good mechanical qualities and is wear-resistant
  • Good resistance to heat
  • It is powerful and elastic
  • It has a working temperature range of -35°C tot + 120°C (-30 ° F tot + 250 ° F)

The downside of NBR

  • It has limited resistance to weather and ozone conditions
  • Not well resistant to aromatic compounds, halogenated hydrocarbons, ketone brake fluids and strong acids
  • Must be kept out of direct sunlight
  • The working temperature range is limited in comparison to other materials

On this page we offer our range of 40> Shore A O-Rings. Search for your specific O ring by using the filters on the left of the page or take your time and browse our wide range of our products. When you can not find the product you are looking for in our  40> Shore A made from NBR, please send us a Direct Enquiry. Together we can discuss the specifications and find the right product for you.

26 products
Most sold arrow_drop_down
ProductDimensionsMaterialHardness (Shore A)CertificationStock
O-Ring 10x3.5 NBR-BUNA 40 Shore A - Black - ses-441471 O-ring Black10 x 3.5NBR-Buna0.137795 Shore ANee56 icon
O-Ring 81.92x5.33 NBR-BUNA 40 Shore A - Black - ses-300360 O-ring Black81.92 x 5.33NBR-Buna0.2098421 Shore ANee53 icon
O-Ring 135x6.5 NBR-BUNA 40 Shore A - Black - ses-424279 O-ring Black135 x 6.5NBR-Buna0.255905 Shore ANee58 icon
O-Ring 2.9x1.78 NBR-BUNA 40 Shore A - Black - ses-325805 O-ring Black2.9 x 1.78NBR-Buna0.0700786 Shore ANee51 icon
O-Ring 69.6x5.7 NBR-BUNA 40 Shore A - Black - ses-314211 O-ring Black69.6 x 5.7NBR-Buna0.224409 Shore ANee60 icon
O-Ring 58.74x3.53 NBR-BUNA 40 Shore A - Black - ses-326785 O-ring Black58.74 x 3.53NBR-Buna0.1389761 Shore ANee54 icon
O-Ring 116.84x5.33 NBR-BUNA 40 Shore A - Black - ses-301704 O-ring Black116.84 x 5.33NBR-Buna0.2098421 Shore ANee60 icon
O-Ring 398x11 NBR-BUNA 40 Shore A - Black - ses-303619 O-ring Black398 x 11NBR-Buna0.43307 Shore ANee55 icon
O-Ring 72.4x5.33 NBR-BUNA 40 Shore A - Black - ses-301632 O-ring Black72.4 x 5.33NBR-Buna0.2098421 Shore ANee57 icon
O-Ring 398x10 NBR-BUNA 40 Shore A - Black - ses-311165 O-ring Black398 x 10NBR-Buna0.3937 Shore ANee59 icon
O-Ring 130x6.5 NBR-BUNA 40 Shore A - Black - ses-424278 O-ring Black130 x 6.5NBR-Buna0.255905 Shore ANee57 icon
O-Ring 613x8 NBR-BUNA 40 Shore A - Black - ses-326776 O-ring Black613 x 8NBR-Buna0.31496 Shore ANee54 icon
O-Ring 104.14x5.33 NBR-BUNA 40 Shore A - Black - ses-300359 O-ring Black104.14 x 5.33NBR-Buna0.2098421 Shore ANee58 icon
O-Ring 21.59x5.33 NBR-BUNA 40 Shore A - Black - ses-523035 O-ring Black21.59 x 5.33NBR-Buna0.2098421 Shore ANee51 icon
O-Ring 50.17x5.33 NBR-BUNA 40 Shore A - Black - ses-523036 O-ring Black50.17 x 5.33NBR-Buna0.2098421 Shore ANee56 icon
O-Ring 12.29x3.53 NBR-BUNA 40 Shore A - Black - ses-424236 O-ring Black12.29 x 3.53NBR-Buna0.1389761 Shore ANee58 icon
O-Ring 110.49x5.33 NBR-BUNA 40 Shore A - Black - ses-301723 O-ring Black110.49 x 5.33NBR-Buna0.2098421 Shore ANee51 icon
O-Ring 62x5 NBR-BUNA 40 Shore A - Black - ses-303899 O-ring Black62 x 5NBR-Buna0.19685 Shore ANee51 icon
O-Ring 499x8 NBR-BUNA 40 Shore A - Black - ses-326777 O-ring Black499 x 8NBR-Buna0.31496 Shore ANee56 icon
O-Ring 50.52x1.78 NBR-BUNA 40 Shore A - Black - ses-475935 O-ring Black50.52 x 1.78NBR-Buna0.0700786 Shore ANee51 icon
O-Ring 117.07x3.53 NBR-BUNA 40 Shore A - Black - ses-325278 O-ring Black117.07 x 3.53NBR-Buna0.1389761 Shore ANee53 icon
O-Ring 433.6x10 NBR-BUNA 40 Shore A - Black - ses-301502 O-ring Black433.6 x 10NBR-Buna0.3937 Shore ANee55 icon
O-Ring 88.27x5.33 NBR-BUNA 40 Shore A - Black - ses-300361 O-ring Black88.27 x 5.33NBR-Buna0.2098421 Shore ANee57 icon
O-Ring 62.87x5.33 NBR-BUNA 40 Shore A - Black - ses-303650 O-ring Black62.87 x 5.33NBR-Buna0.2098421 Shore ANee55 icon
O-Ring 52x2 NBR-BUNA 40 Shore A - Black - ses-318813 O-ring Black52 x 2NBR-Buna0.07874 Shore ANee53 icon
O-Ring 65x5 NBR-BUNA 40 Shore A - Black - ses-301942 O-ring Black65 x 5NBR-Buna0.19685 Shore ANee59 icon