O-rings feitos de elastômero: o que significa?

O-rings made from elastomer: what do they mean?

Elastomer O-ring

Most O-rings are made from elastomer . Elastomer refers to the elasticity of rubbers that change shape when subjected to force and return to their original shape once the force stops.

The basis of these elastomers is rubber. This can be “natural” when it comes to plantations or “synthetic” when it comes to the chemical industry. Nowadays, the second option is normally applied for the production of O-rings.

One of the most used synthetic rubbers for the production of O-rings is NBR, whose chemical name of the basic polymer is: acrylonitrile butadiene rubber (DIN ISO 1629: NBR / ASTM D 1418: NBR).

Properties and advantages of NBR O-rings:

NBR O-rings offer good resistance to:

  • Oils and greases based on mineral oils
  • Halphatic Hydrocarbon
  • Vegetable and animal oils and fats
  • Hydraulic oils (H, HL, H-LP)
  • Hydraulic fluids (HFA, HFB, HFC)
  • Silicone oils and silicone greases
  • Water (maximum 80°C)

But it is not recommended to contact:

  • Fuels with high aromatic content
  • Aromatic hydrocarbons
  • Chlorinated hydrocarbons
  • Non-polar solvents
  • Glycol-based brake fluids
  • Ozone, atmospheric agents, aging

Information about NBR sealing rings

In O-rings, acrylonitrile butadiene rubber (NBR) is the most common material due to its good mechanical properties, high abrasion resistance, low gas permeability, and high resistance to oil-based mineral oils and grease. NBR is a copolymer of butadiene and acrylonitrile. Depending on the application, the acrylonitrile content can vary between 18% and 50%.

Here you will find our entire range of sealing rings available to purchase.

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