ASTM D943 - 18

    Standard Test Method for Oxidation Characteristics of Inhibited Mineral Oils

    Active Standard ASTM D943 | Developed by Subcommittee: D02.09.0C

    Book of Standards Volume: 05.01


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    Significance and Use

    5.1 This test method is widely used for specification purposes and is considered of value in estimating the oxidation stability of lubricants, especially those that are prone to water contamination. It should be recognized, however, that correlation between results of this method and the oxidation stability of a lubricant in field service may vary markedly with field service conditions and with various lubricants. The precision statement for this method was determined on steam turbine oils.

    Note 1: Furthermore, in the course of testing a lubricant by this method, other signs of deterioration, such as sludge formation or catalyst coil corrosion, may appear that are not reflected in the calculated oxidation lifetime. The subcommittee responsible for this method is investigating the application of alternative criteria for evaluation of lubricants using this test apparatus. Test Method D4310 is now available for sludge measurement.

    1. Scope

    1.1 This test method covers the evaluation of the oxidation stability of inhibited steam-turbine oils in the presence of oxygen, water, and copper and iron metals at an elevated temperature. This test method is limited to a maximum testing time of 10 000 h. This test method is also used for testing other oils, such as hydraulic oils and circulating oils having a specific gravity less than that of water and containing rust and oxidation inhibitors.

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

    1.2.1 Exception—The values in parentheses in the figures are provided for information for those using old equipment based on non-SI units.

    1.3 WARNING—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use Caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location.

    1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see Section 7.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    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

    A510 Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel (Metric) A0510_A0510M

    B1 Specification for Hard-Drawn Copper Wire

    D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    D1193 Specification for Reagent Water

    D3244 Practice for Utilization of Test Data to Determine Conformance with Specifications

    D3339 Test Method for Acid Number of Petroleum Products by Semi-Micro Color Indicator Titration

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

    D4310 Test Method for Determination of Sludging and Corrosion Tendencies of Inhibited Mineral Oils

    D5770 Test Method for Semiquantitative Micro Determination of Acid Number of Lubricating Oils During Oxidation Testing

    E1 Specification for ASTM Liquid-in-Glass Thermometers

    E2877 Guide for Digital Contact Thermometers

    British Standard

    BS1829


    ICS Code

    ICS Number Code 75.100 (Lubricants, industrial oils and related products)

    UNSPSC Code

    UNSPSC Code 51171630(Mineral oil)


    Referencing This Standard
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    DOI: 10.1520/D0943-18

    Citation Format

    ASTM D943-18, Standard Test Method for Oxidation Characteristics of Inhibited Mineral Oils, ASTM International, West Conshohocken, PA, 2018, www.astm.org

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