ASTM D4921 - 20

    Standard Test Method for Foaming Tendencies of Engine Coolants at Room Temperature

    Active Standard ASTM D4921 | Developed by Subcommittee: D15.06

    Book of Standards Volume: 15.05


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    Significance and Use

    4.1 The test method will generally identify coolants that have a tendency to foam excessively at room temperature.

    Note 1: In use, the foaming tendency of a coolant solution may be increased by service aging or contamination.

    1. Scope

    1.1 This test method applies to a simple shake test for evaluating the tendency of an aqueous solution of engine coolant to foam at room temperature.

    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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 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

    D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes


    ICS Code

    ICS Number Code 71.100.40 (Surface active agents)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D4921-20

    Citation Format

    ASTM D4921-20, Standard Test Method for Foaming Tendencies of Engine Coolants at Room Temperature, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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