Buna Nitrile Rubber O-Rings for 3 ID, Pack of 10

Sterling Seal Buna N or Nitrile is a copolymer of butadiene and acrylonitrile, with the acrylonitrile content in commercial products varying 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. However, 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 with regard to compression set or cold flow, tear, and abrasion resistance. While they inherently possess good resistance to ozone, sunlight, or weather, this can be substantially improved through compounding.

It should be noted that 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.

ORBN041x10 is suitable for use across a wide temperature range from -30 degrees Fahrenheit to 250 degrees Fahrenheit, with good to excellent resistance to many petroleum oils/greases, hydraulic fluids, alcohol, mineral oil, and grease. It is compatible with aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oils and greases, diesel fuel, and fuel oil) but not with product fuels with a high aromatic content, aromatic hydrocarbons (benzene), or chlorinated hydrocarbons (trichloroethylene).

Buna N or Nitrile has good mechanical properties when compared with other elastomers and high wear resistance. It offers good to excellent resistance to many petroleum oils/greases, hydraulic fluids, alcohol, mineral oil, and grease, and has a 70 Durometer rating.

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