Freudenberg Hydrogenated Nitrile (HNBR)

Freudenberg Hydrogenated Nitrile (HNBR) Material Description:

HNBR (hydrogenated-acrylonitrile-butadiene-rubber) is a material that is generated by full or partial hydrogenation of the double bond-containing butadiene portions of normal NBR polymers. Thus, HNBR offers a similar chemical resistance to NBR, but has better heat and oxidation stability. Furthermore, the material is characterized by high mechanical strength and improved abrasion resistance.

HNBR is often used in dairies, cheese-making facilities and other milk-processing plants, where the fat content of the product to be processed is so high that EPDM is no longer deployable.

Freudenberg Seal Distributor

Engineered Seal Products is proud to be a "Freudenberg North American Preferred Partnered":

  • Involvement of engineering services and technical material know-how from Freudenberg Sealing Technologies
  • Highest technical seal competence through qualified training and certified sealing know-how
  • Efficient and speedy cross-linked processes with Freudenberg Sealing Technologies • High and quick availability assuring a reliable delivery performance
Freudenberg (EPDM) Suitable Areas of Application:
  • Partly higher chemical resistance than NBR
  • Better heat and oxidation stability than NBR
  • High mechanical strength
  • Improved abrasion resistance
  • Can be used well in water, steam and ultrapure water
  • Temperature-resistant from –30 °C to +150 °C (–22 °F to +302 °F)

Freudenberg Hydrogenated Nitrile (HNBR) Compounds:

Compound Number Datasheet Hardness (Shore A) Low Temp High Temp Color Products
70 HNBR 254067 PDF 70 +- 5 -30 140 Green Molded parts
75 HNBR 231142 PDF 75 +- 5 -35 140 Black O-Rings
85 HNBR 216553 PDF 85 +- 5 -25 140 Green Molded parts

ASTM Designation
Shelf Life
15 Years
Hardness (Shore A) Range
65 - 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.