Sterling Seal and Supply (STCC) ORBN455 Number 455 Standard O-Ring, Buna Nitrile Rubber, 13 ID, 13-1/2 OD Standard Buna Nitrile Rubber O-Ring

Sterling Seal & Supply's Buna N or Nitrile 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 base 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 0-rings require nitrile-based compounds.

It is important to note 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. 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.

ORBN455 is suitable for use across a wide temperature range from -30 degrees Fahrenheit (-34 degrees Celsius) to 250 degrees Fahrenheit (121 degrees Celsius) and is compatible with aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oils and greases, diesel fuel, and fuel oil). It is not compatible 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 has good/excellent resistance to many petroleum oils/greases, hydraulic fluids, alcohol, mineral oil, and grease. The versatility and performance of Buna N or Nitrile make it a widely used material in various applications, including off-road equipment, automotive, marine, and aircraft fuel systems.

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