ASTM D2070 - 91(2010)

    Standard Test Method for Thermal Stability of Hydraulic Oils

    Active Standard ASTM D2070 | Developed by Subcommittee: D02.N0.08

    Book of Standards Volume: 05.01


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    Significance and Use

    Thermal stability characterizes physical and chemical property changes which may adversely affect an oil's lubricating performance. This test method evaluates the thermal stability of a hydraulic oil in the presence of copper and steel at 135°C. Rod colors are the evaluation criteria. Sludge values are reported for informational purposes. No correlation of the test to field service has been made.

    1. Scope

    1.1 This test method is designed primarily to evaluate the thermal stability of hydrocarbon based hydraulic oils although oxidation may occur during the test.

    1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    Copper Development Association Standard

    UNSC11000 Electrolytic Tough Pitch Copper

    American Iron and Steel Institute Standard (AISI)

    W-1 Carbon Tool Steel


    ICS Code

    ICS Number Code 75.120 (Hydraulic fluids)

    UNSPSC Code

    UNSPSC Code 15121504(Hydraulic oil)


    Referencing This Standard

    DOI: 10.1520/D2070-91R10

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D2070-91(2010), Standard Test Method for Thermal Stability of Hydraulic Oils, ASTM International, West Conshohocken, PA, 2010, www.astm.org

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