Nitrile (NBR) Butadiene Rubber Seals for Industrial and Domestic Use

Nitrile Butadiene Rubber (NBR) is usually considered as the backbone of the industrial and automotive rubber products industries. NBR is actually a complex family of unsaturated synthetic rubber copolymers of acrylonitrile (ACN) and butadiene. The physical and chemical properties of NBR depend on the percentage of acrylonitrile in the base polymer. Generally, this type of synthetic rubber is resistant to oil, fuel, grease, water, air and flame retardant liquids (HFA, HFB, HFC).

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Today, NBR is one of the most popular sealing elements due to its strong engineering properties. NBR rubber seals, can be used in hydraulic liquid, gas oil, silicon oil, animal and vegetable oils and fats as well as hot and cold water.

Beneficial Aspects of Nitrile Rubber Seals

The following aspects of NBR have made it the most widely used elastomer in the sealing industry today:

Nitrile rubber, also known as NBR and Buna-N is a useful gasket material that many buyers refer to as nitrile. Useful though it is, Nitrile Rubber Gaskets are not a solution to every sealing challenge. Here’s some advice on when and when not to use it.

Properties of Nitrile Rubber

Nitrile or NBR is a synthetic rubber with good flexibility and resilience over a temperature range of -30 to +200 °F (-34 to +93 °C). It has good strength and abrasion resistance and a low compression set, all of which make it an effective gasket material. It’s also available as FDA-approved white nitrile for food industry applications.

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A particular strength of nitrile is its ability to withstand attack by oils and fuels. Many gasket materials swell and break down when exposed to lubricants, hydraulic fluids or gasoline, but not nitrile. As a result, it’s used extensively with engines, generators, and fuel and hydraulic systems.

It does however have some weaknesses. It’s not for high-temperature applications, it doesn’t have good weather resistance and it will be attacked by polar solvents.

Polar Solvents and Nitrile Rubber Gaskets

Polar solvents are those where the molecules are composed of atoms with significantly different electrical charges. One example is oxygen and hydrogen. Others are acetone, ethanol, and acetic acid. In chemistry terms, these are considered to have a high permittivity or dielectric constant. You might notice that compounds with a high dielectric constant, like pure water, are also good electrical insulators.

Nitrile is susceptible to attack by polar solvents like those listed above. Interestingly though, while water is also polar, it’s a solvent to which nitrile has some resistance. However, for sealing against water, better gasket material choices would be neoprene or EPDM.

Consider Conditions Before Asking for Nitrile

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