Understanding seals: Pushing the boundaries of gearbox performance

Deepening understanding

When the SEW test was first introduced, lubricants proved relatively capable with FKM seals but not NBR seals.

Afton has therefore undertaken extensive research to explore more deeply what happens to seals under these conditions. Lengthy rig tests have been carried out using seals from different OEMs such as Freudenburg and Trelleborg, revealing that there can be more than one pathway to seal degradation.

Understanding the different processes involved in these pathways is essential for developing successful formulation strategies and enabling lubricants to achieve multiple OEM approvals. Current research work includes developing better predictive screener tests for NBR seal longevity, as well as solving FKM wetting issues.

Ortlinghaus Clutch test:

Although not a dynamic seal test, a further test worthy of mention here is Ortlinghaus – a wet brake test used primarily for marine applications. Many industrial gear lubricants are used in marine applications, making it a desirable – if challenging – test to pass.

The relevance of and particular challenge for Ortlinghaus is being able to achieve required friction capability without negatively impacting dynamic seal compatibility. With it being a rather costly test with limited capacity and a long leadtime, Afton has developed a useful screener test with excellent predictive value, which can be run prior to investing in the full Ortlinghaus test.

Overcoming future challenges

Gearboxes are highly complex systems: multiple interactions occur between different components in parallel, some synergistic and some antagonistic; some beneficial and some harmful.

Seal testing will become ever more demanding as OEMs maintain focus on this area. Afton’s deeper understanding of seal failure is informing the development of additive solutions that build upon its leading expertise in gear and bearing protection.

Looking for the seal of approval? Ask your local Afton representative for more details.

© 2023. Afton Chemical Corporation is a wholly owned subsidiary of NewMarket Corporation (NYSE:NEU). 01/23. The information in this bulletin is, to our best knowledge, sure and accurate, but all recommendations or suggestions are made without guarantee since the conditions of use are beyond our control. Afton Chemical Corporation and its affiliates disclaim any liability incurred in connection with the use of these data or suggestions. Furthermore, nothing contained herein shall be construed as a recommendation to use any product in conflict with existing patents covering any material or its use.