Lubricant compatibility of FKM seals in synthetic oils

verfasst von

Dilek Bulut, Tatjana Krups, Gerhard Poll, Ulrich Giese

Abstract

Purpose: Elastomer seals are used in many applications. They are exposed to lubricants and additives at elevated temperatures, as well as mechanical stresses. They can only provide good sealing function when they have resistance to those factors. There are many elastomer-lubricant compatibility tests based on DIN ISO 1817 in industry. However, they are insufficient and costly. Correlations between the tests and the applications are inadequate. The purpose of this study is investigating lubricant compatibility of fluoroelastomers (FKM) seals in polyethylene-glycol (PG)- and polyalphaolefin (PAO)- based synthetic oils and developing a methodology to predict seal service life. Design/methodology/approach: A new compatibility test which is more sufficient in terms of time and cost was developed and compared with a standard test, currently used in industry. Compatibility of FKM radial lip seals with PG- and PAO-based synthetic oils with different additives was investigated chemically and dynamically. Failure mechanisms were examined. Findings: The new method and the Freudenberg Flender Test FB 73 11 008 showed similar results concerning damages and similar tendencies regarding wear. The additive imidazole derivative was the most critical. Static tests give indications of possible chemically active additives, but alone they are insufficient to simulate the dynamic applications. Originality/value: The paper describes a new method to investigate elastomer-lubricant compatibility and gives first results with a variety of lubricants.

Organisationseinheit(en)

Institut für Maschinenkonstruktion und Tribologie
Naturwissenschaftliche Fakultät

Typ

Artikel

Journal

Industrial Lubrication and Tribology

Band

72

Seiten

557-565

Anzahl der Seiten

9

ISSN

0036-8792

Publikationsdatum

22.07.2019

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Maschinenbau, Energie (insg.), Oberflächen, Beschichtungen und Folien

Elektronische Version(en)

https://doi.org/10.1108/ILT-02-2019-0065 (Zugang: Geschlossen)