Sealing Shielding

How to Enhance Safety and Avoid Mix-up of Seals in Automotive Applications

How to enhance safety and Avoid Mix-up of Seals in Automotive applications - neuer werkstoff automotive

Modern high-performance engines require seals and sealing systems that deliver top performance in terms of operating reliability and service life as well. The new Parker Prädifa HNBR material N9192-80 meets the challenging requirements of these applications in an outstanding manner. Due to the intelligent formulation of the periodically linked HNBR compound, the seal’s strength values, abrasion performance and restoring rate could be improved to yet another higher level. For high-load dynamic applications, this means an enormous gain in reliability. In addition, thanks to its gray color, the risk of confusing the seals with commonly used black seals can be excluded.


In N9192-80, Parker Prädifa is offering a new universally usable HNBR compound for challenging demands. The material that is particularly suitable for automotive applications is characterized by good cold flexibility down
to -35 °C and resistance against commonly used hydraulic media, specifically in automobiles. In addition, N9192-80 exhibits very good resistance to coolants and engine oils. Wear resistance has been improved by 30% compared to standard HNBR compounds.


Enormous gain in reliability

HNBR polymers are produced by hydrogenation of NBR, which results in higher temperature resistance and better protection against oxidative attacks. Compared with conventional HNBRs, the new N9192 compound was improved once more by skillful selection of the raw materials and formulation. Due to the material´s gray color, a mix-up of the seals with black seals (e.g. based on EPDM, FKM, AEM and ACM) in automobiles can be excluded. As mix-ups harbor the risk of seal failure in important technical components that may result in high costs up to and including recalls and the associated risk of major image loss to the manufacturer, this is a significant gain in reliability and safety.


Excellent resistance

N9192 is resistant against mineral oil based hydraulic fluids and fully synthetic transmission fluids. Its improved dynamic properties qualify the compound for reliable utilization in challenging hydraulic applications. Additional fields of application for N9192 are opening up in refrigeration engineering and in the coolant circuit as the compound has very good resistance in coolants.

Furthermore, N9192 is suitable for use as a sealing material in diesel exhaust gas technology as the compound exhibits no significant changes in mechanical properties, particularly volume swelling, in 32.5 % urea solutions (AdBlue®). The aqueous urea solution is used in the catalytic reduction of environmentally toxic nitrogen oxides that are produced in the combustion process of diesel engines. 


Health and environment

N9192 is a new high-performance compound that additionally satisfies two further requirements in terms of health and environmental protection. Naturally, the compound complies with legal requirements (REACH, SVHC, RoHS, etc.). In addition, N9192 is free from polycyclic, aromatic hydrocarbons (PAHs) which have been proven to be carcinogenic as well as having a major adverse effect on the environment. Measurements obtained according to ZEK 01.4-08 (GS) QMA 2001.1284 are below the limit of quantitation (LOQ) of 0.2 mg/kg, as confirmed by the DEKRA Laboratory for Environmental and Product Analytics in Stuttgart.


Summary of properties

  • Good low- and high-temperature performance
  • Very good resilience in high-load applications
  • Wear and abrasion resistance, extended service life
  • Very good media resistance
  • Resistance against engine oil
  • Contains no prohibited substances or substances requiring declaration according to GADSL, SVHC, PFOS
  • RoHS-, WEEE-conformant
  • PAH-free


Parker Praedifa Material EntwicklungArticle contributed by

Dr. Maria Fleischer
Compound and Process Development
Engineered Materials Group,
Prädifa Technology Division





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