Effects of Contamination of Biobased Hydraulic Fluids with Mineral Oil

    Volume 6, Issue 1 (January 2009)

    ISSN: 1546-962X


    Published Online: 5 January 2009

    Page Count: 9

    Theissen, Heinrich W.
    IFAS Institute for Fluid Power Drives and Controls, RWTH Aachen University, Aachen,

    (Received 28 November 2007; accepted 12 November 2008)


    There are many occasions for biobased hydraulic fluids to be contaminated with mineral oil, caused either by incomplete flushing during conversion from mineral oil to bio-oil, or by carelessness during maintenance and refilling. With high contamination levels, problems like foaming, poor air release, or filter clogging have been reported. In experiments at IFAS (Institute for Fluid Power Drives and Controls) of RWTH Aachen University, relevant properties of biobased oils contaminated with different levels of various mineral oils have been analyzed. It was found, that the degree of deterioration correlates not to the amount of mineral oil added, but to the amount of metals introduced through the mineral oil’s additives. Deterioration effects may take several hours or days to develop. The effects are specific for different bio-oil products. As a practical consequence, some changes in quality control, product documentation, and standardization are recommended.

    Paper ID: JAI101598

    DOI: 10.1520/JAI101598

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    Title Effects of Contamination of Biobased Hydraulic Fluids with Mineral Oil
    Symposium Symposium on Contamination of Hydraulic Systems and its Effect on Performance, 2007-12-03
    Committee D02