Buna Nitrile O-Rings, 5/16 ID, 7/16 OD, Pack of 1000

Buna N or Nitrile is a copolymer of butadiene and acrylonitrile, with acrylonitrile content varied in commercial products from 18% to 48%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but 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 F (- 54 to +135 degrees C). Most military rubber specifications for fuel and oil resistant MS and AN O-rings require nitrile base compounds.

It should be noted, however, that to obtain good resistance to low temperature 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. Inherently, they do possess good resistance to ozone, sunlight or weather, but this can be substantially improved through compounding. Nevertheless, since ozone and weather resistance are not always built in, seals from nitrile bases should not be stored near electric motors or other equipment which may generate ozone, or in direct sunlight.

ORBN011x1000 is suitable for use across a wide temperature range from -30 degrees F to 250 degrees F, with good/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 is widely used in oil-resistant applications of all types, including low temperature military uses and off-road equipment, as well as in automotive, marine, and aircraft fuel systems.

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