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This article describes a special test procedure for biodegradable fluids based on natural and synthetic esters and gives results of their examination. The test allows the evaluation of the special properties of these fluids, e. g. hydrolytic stability. By using a long endurance test, the fluid's behaviour during its use can be examined. The test rig works with serial hydraulic components. The loads are higher than in practice applications in order to reduce testing time. Therefore the results are transformable to practice and it is possible to give a precise description of the fluid's behaviour. The change of the fluid's properties and the ageing behaviour can be determined by analysing samples. With this knowledge the technical performance of the fluids can be improved, by changing additive packages or base fluid types.
Biodegradable hydraulic pressure media, oxidation stability, ageing mechanism, hydrolytic stability, deep temperature performance, ageing test procedure, tribology
Academic employee, University of Technology Aachen, RWTH,