Buna Nitrile O-Rings

Buna Nitrile O-Ring Material Description

Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to their resistance to petroleum-based fuels and lubricants and their relatively low price. Nitrile elastomers are copolymers of acrylonitrile and butadiene. (Learn why NBR is a popular choice). There are a number of common variations of nitrile compounds. Nitrile o-rings may also come in a metal-detectable variation while retaining the same qualities as the general Nitrile o-ring compound.

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For applications requiring o-rings with high visibility, High-Visibility Nitrile o-rings are recommended. High-Visibility o-rings maintain properties identical to its original compound, with the addition of a distinguishable neon green hue.

Acrylonitrile Content

The acrylonitrile (ACN) content of the polymer chains can vary from 18% to 50%. Lower ACN content gives better low-temperature properties but inferior resistance to fuels and polar lubricants. Higher ACN content gives lesser quality low-temperature properties but improves fuels and polar lubricants resistance. Standard NBRs typically have 34% ACN content.

Cure System: Sulfur-Cured & Peroxide Cured

Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Peroxide-cured nitrile o-rings have better heat resistance and lower compression sets but are more expensive and more difficult to process. Standard materials in stock include sulfur-cured 70 & 90 durometers (N70, N90) and peroxide-cured 90 durometer (N90PC).

Buna Nitrile Compounds

Compounds Durometer Color Temp Range (F) Data Sheet Description N50 50

Black

-40 to +212 General purpose N70-A101 70

Black

-22 to +250 General purpose N 70

Black

-40 to +212 NSF 61, FDA N 70

Black

-40 to +212 UL 157 Approved N 70

Black

-67 to +212 General purpose, low temp resistance N 70

Black

-35 to +250 General purpose N 70

Blue

-40 to +212 Metal/X-ray detectable, FDA-Grade N 70

Green

-40 to +212 General Purpose N 70

White

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Green

-40 to +212 Metal/X-ray detectable, FDA-Grade N90-A101 90

Black

-13 to +250 General purpose N 90

Black

-65 to +300 Low Temperature N90HG 90

Green

-4 to +248 High visibility N90PC 90

Black

-20 to +257 Peroxide-Cured

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Nitrile Buna-N (NBR) O-Rings Material Description

Nitrile Buna-N (NBR) o-rings are one of the most common and widely used sealing materials because of its excellent sealing and mechanical properties at a low cost. Nitrile offers excellent tensile strength, abrasion resistance, tear resistance, and compression resistance. Optimal environments include petroleum oils and fuels, silicone oils and greases, propane, ethylene glycol, butane, vegetable, mineral oils and greases, dilute acids, and water and steam applications (below 212°F).

Engineered Seal Products has the expertise and inventory for your nitrile Buna-N (NBR) o-ring applications. For over 50 years, ESP has been the leading engineering, quality, and supply chain choice for both standard and custom sealing applications. A seal, no matter the application, has to do just that.

Also Know As:

Nitrile, Buna-N, acrylonitrile-butadiene terpolymer, Breon, Butakon®, Chemigum®, Hycar®

Contact us to discuss your requirements of NBR O Ring. Our experienced sales team can help you identify the options that best suit your needs.