Stock & Availability

In Stock: 582
Inbound Stock: 20,696
Qty Available
7,900 05/18/2022
7,796 06/09/2022
5,000 07/20/2022
Overseas Stock: 1,350 ($50 Line Min)
Expedited Shipping*: 01/31/2022
Standard Shipping: 04/20/2022
New Production: Unlimited ($250 Line Min)
Expedited Shipping*: 05/09/2022
Standard Shipping: 08/03/2022
*Add your desired qty and click ADD TO CART to see expedite fees and options.

Interchange Part Numbers

  • MCMASTER-CARR 9751K132

Additional information

Weight 0.00402 lbs
Shipping Dimensions 2.573 × 2.573 × 0.118 in




SPEC SHEET: Nitrile (Buna) 90 Durometer

Nitrile Rubber (NBR)

Material Description

Nitrile rubber (NBR) also known as Buna N is one of the most commonly used sealing elastomers due to its resistance to petroleum-based fuels and lubricants and its relatively low price. Nitrile elastomers are copolymers of acrylonitrile and butadiene. There are a number of common variations of nitrile compounds.

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 improved fuels and polar lubricants resistance. Standard NBRs typically have 34% ACN content.

Cure system: Sulfur-cured

Standard Nitriles are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Peroxide-cured nitriles have better heat resistance and lower compression sets but are more expensive and more difficult to process.

Temperature Range:

Standard Low Temp: -40&degC (-40&degF)
Standard High Temp: 100&degC (212&degF)