Hydrogenated Nitrile (HNBR) O-Rings

Hydrogenated Nitrile (HNBR) O-Rings Material Description

Hydrogenated Nitrile o-rings come from adding hydrogen to the nitrile molecular chain to make it more stable. The addition of hydrogen reduces the number of carbon-carbon double bonds, making it less reactive. It can be used in petroleum oils and fuels, R134a refrigerant gas, silicone oils and greases, ozone applications, vegetable and animal fats and fluids, water and steam (up to 300° F).

Engineered Seal Products has the expertise and inventory for your hydrogenated nitrile (HNBR) 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:

Therban®, Tornac®, Zetpol®

What's The Difference Between Hydrogenated Nitrile (HNBR) & Nitrile (NBR) O-Rings?

In comparison with NBR, HNBR has better abrasion resistance, tear resistance, high-temperature properties and resistance to chemical attacks.

Hydrogenated Nitrile (HNBR) Advantages:

Compatible for applications that come in contact with:

  • Petroleum oils and fuels
  • R134a refrigerant gas
  • Silicone oils and greases
  • Ozone applications, improved compression set characteristics
  • Vegetable and animal fats
  • Fluids
  • Water and steam (up to 300° F)
Hydrogenated Nitrile (HNBR) Disadvantages:

Incompatible for applications that come in contact with:

  • Chlorinated hydrocarbons
  • Ketones, esters and ethers
  • Strong acids

Hydrogenated Nitrile (HNBR) Material Properties


Hydrogenated Nitrile (HNBR) Material Temperature Range:

Heat Resistance: Up to approximately 300°F (150°C)

Cold Flexibility: Down to approximately -55°F (-48°C).

Normal Recommended Temperature Range Normal recommended temperature range

Extended Temperature Range Extended Temperature Range for short term only

Abrasion Resistance Good
Chemical Resistance Fair / Good
Cold Resistance Good
Heat Resistance Excellent
Oil Resistance Excellent
Ozone Resistance Good
Tensile Strength Excellent
Water/Steam Resistance Excellent

Material properties & Temp ranges based on Parker o-Ring Handbook (ORD 5700) recommendations.


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ASTM Designation
HNBR
Shelf Life
15 Years
Hardness (Shore A) Range
50 - 90

Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.

ESP’s shelf life recommendation is based on the ARP 5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture, to the time of assembly.