Sterling Seal ORBN008x1000 Standard O-Ring, Buna Nitrile, 3/16 ID, 5/16 OD, Pack of 1000

Nitrile, also known as Buna N, is a copolymer of butadiene and acrylonitrile. The acrylonitrile content in commercial products varies from 18% to 48%. As the nitrile content increases, the resistance to petroleum-based oils and hydrocarbon fuels increases, but the low-temperature flexibility decreases.

Nitrile is the most widely used elastomer in the seal industry today due to its excellent resistance to petroleum products and its ability to be compounded for service over a temperature range of -65 to +275 degrees Fahrenheit (-54 to +135 degrees Celsius). Most military rubber specifications for fuel and oil-resistant MS and AN O-rings require nitrile-based compounds.

It is important to note that to obtain good resistance to low temperatures with nitrile compounding, it is almost always necessary to sacrifice some high-temperature fuel and oil resistance. Nitrile compounds are superior to most elastomers when it comes to compression set or cold flow, tear, and abrasion resistance.

Inherently, nitrile compounds possess good resistance to ozone, sunlight, or weather, but this can be substantially improved through compounding. However, since ozone and weather resistance are not always built-in, seals from nitrile bases should not be stored near electric motors or other equipment that may generate ozone or in direct sunlight.

The versatility of nitrile compounds makes them suitable for a wide range of applications, including:

1. Oil-resistant applications of all types
2. Low-temperature military uses
3. Off-road equipment
4. Automotive, marine, and aircraft fuel systems

Nitrile compounds have a durometer of 70 and are compatible with aliphatic hydrocarbons, such as propane, butane, petroleum oil, mineral oils, and greases, as well as diesel fuel and fuel oil. However, they are not compatible with fuels with a high aromatic content, aromatic hydrocarbons (benzene), or chlorinated hydrocarbons (trichloroethylene).

Compared to other elastomers, Buna N or Nitrile has good mechanical properties and high wear resistance, making it a valuable material for various industrial applications.

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