Nitrile Rubber (NBR, Buna-N)

Description:

Nitrile rubber, also known as Nitrile butadiene rubber (NBR) and Buna-N, is a synthetic copolymer composed of acrylonitrile and butadiene. Nitrile is widely used due to its resistance to oils, fuels, and other chemicals.

Common Uses:

Nitrile is found in:

  • Automotive, marine, and aeronautical fuel and oil systems
  • Disposable non-latex gloves
  • Belts, hoses, O rings, gaskets
  • Oil seals
  • Adhesives
  • Footwear and floor mats

Properties:

Standard Compound: -40°C (-40°F) to 100°C (212°F)

Special Compound: -55°C (-67°F) to 135°C (275°F)

Hardness: 40 to 90 Shore A

ASTM D1418 Designation: NBR

ASTM D2000 Designation: BF, BG, BK, CH

Standard Colors: Black

Optional Colors:

Production:

Standard NBR compounds have a 34% acrylonitrile (ACN) content. However, the ACN content can be varied from 18% to 50% to adjust the temperature and resistance properties of the material.

Nitriles can be sulfur or peroxide cured which affects the temperature and hardness and compression set properties of the material.

Advantages:

Nitrile rubber compounds perform especially well in petroleum based fuels and oils, aliphatic hydrocarbons, vegetable oils, silicone oils and greases, ethylene glycol, dilute acids, and water below 100°C (212°F).

Limitations:

Nitrile rubber compounds are susceptive to the ozone, ketones, ethers, esters, aromatic hydrocarbons, automotive brake fluid, strong acids, and aldehydes. Products made with Nitrile rubber, such as non-latex gloves, may spontaneously oxidize when coming into contact with strong oxidizers.

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