Hydrogenated Nitrile Rubber (HNBR)

Description:

Hydrogenated Nitrile (HNBR) is a synthetic polymer that is obtained by saturating the double bonds in nitrile’s butadiene segments with hydrogen. HNBR is known for its physical strength and resistance to heat, oil, and chemicals.

Common Uses:

HNBR is found in:

  • Sealing for oil well exploration and processing
  • Dynamic and static seals, hoses, and belts
  • Oil resistant applications
  • Industrial applications
  • Automotive air conditioning systems

Properties:

Standard Compound: -40°C (-40°F) to 150°C (302°F)

Special Compound: -55°C (-67°F) to 165°C (330°F)

Hardness: 50 to 90 Shore A

ASTM D1418 Designation: HNBR

ASTM D2000 Designation: CH, DF, DH

Standard Colors: Black, Green

Optional Colors:

Production:

HNBR’s are usually peroxide cured. They can also be sulfur cured to improve properties of flexibility in dynamic systems, but this will reduce the compound’s heat resistance and cause poorer compression set.

Advantages:

HNBR rubber compounds perform well in petroleum based oils and fuels, aliphatic hydrocarbons, vegetable oils, silicone oils and greases, ethylene glycol, water and steam to 150°C ( 300°F), and dilute acids, bases and salt solutions to moderate temperatures.

Limitations:

HNBR rubber compounds are susceptive to exposure to chlorinated hydrocarbons, esters, ethers, ketones, and strong acids.

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