905 O-RING NITRILE (NBR, BUNA)
90 DUROMETER BLACK
CS: .072″ (1.83MM)
ID: .414″ (10.52MM)

N90905

Stock & Availability
In Stock: 34,384
Inbound Stock: 85,000
Qty Available
85,000 09/03/2024
Offsite Stock: 63,225 ($50 Line Min)
Expedited Shipping*: 04/29/2024
Standard Shipping: 07/18/2024
New Production: Unlimited ($250 Line Min)
Expedited Shipping*: 06/24/2024
Standard Shipping: 09/12/2024
*Add your desired qty and click ADD TO CART to see expedite fees and options.

Interchange Part Numbers

  • MCMASTER-CARR 9751K115

Additional information

Weight 0.0003 lbs
Shipping Dimensions 0.558 × 0.558 × 0.072 in
Material

Color

Durometer

Size

905

Description

SPEC SHEET: Nitrile (Buna) 90 Durometer.pdf

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)