As can be seen in Figure 7, for Grease I with ZDDP, the ECR values increase continuously and, after six hours, remain stable at a very high level. For Grease 2 (without ZDDP), the value remained consistently low throughout the entire test period.


Highlights • Using a simple test matrix, the investigation showed that the tribological performance of lubricants can be effectively assessed through dynamic testing with varying electric currents and amounts.


• This represents a promising test method under EV-like electrical and mechanical conditions.


• It enables industry and formulators to better target lubricant design and optimise formulations for diverse applications.


Outlook This project will continue with an investigation into the effects of base oils (different synthetic oils) and other selected additive molecules, with the results to be published.


References [1] Jackson, A., Scale-dependent properties of electric contact resistance and quantum effects, Appl. Phys. Lett., 2015, 107, 093103.


[2] Bond, T., Notay, R., Mitigating electrically induced bearing damage using silver nanoparticle- containing greases, Lubricants, 2023, 11(2), 268.


[3] Hagemann, T., Ausböck, M., Schneider, A., Electrical performance testing of lubricants using SRV®


with ECR module, Tribology International, 2023, 190, 108570.


[4] Notay, R., Electro-tribology and EV bearings: Challenges and opportunities, Lube Magazine, 2025, Issue 183, pp. 24–29.


[5] A. Schneider, M. Woydt, Evaluation of electrical contact resistance of lubricating greases in various tribological contacts, EUROGREASE Q1 January- February-March 2023, page 34-41


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