ASTM D7933 - 15

    Standard Test Method for Engine Coolant Stagnation in Flux-Brazed Aluminum Heat Exchangers

    Active Standard ASTM D7933 | Developed by Subcommittee: D15.21

    Book of Standards Volume: 15.05


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    Significance and Use

    4.1 Automobile and truck radiators and heater cores are now predominantly made with aluminum alloys using various manufacturing processes including brazing with a flux (See Appendix X1 for additional information). The presence of residual internal brazing flux in heat exchangers along with the high ratio of internal aluminum surface area to coolant volume may affect certain physical and chemical properties and corrosion protection of the coolant. This test method provides a screening test to assess engine coolant physical and chemical properties and corrosion protection after aging it in a heat exchanger brazed with flux at elevated temperature under stagnant conditions. This method cannot stand alone as evidence of satisfactory coolant performance in flux-brazed aluminum heat exchangers. The actual service of an engine coolant formulation can be determined only by more comprehensive bench, dynamometer, and field tests.

    1. Scope

    1.1 This test method covers a laboratory screening procedure for evaluating engine coolant compatibility and corrosion protection after aging two weeks at 90°C in an aluminum heat exchanger brazed using flux.

    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

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

    D1193 Specification for Reagent Water

    D4340 Test Method for Corrosion of Cast Aluminum Alloys in Engine Coolants Under Heat-Rejecting Conditions

    E230/E230M Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples


    ICS Code

    ICS Number Code 71.100.45 (Refrigerants and antifreezes)

    UNSPSC Code

    UNSPSC Code 40101802(Heat exchangers)


    Referencing This Standard
    Link Here
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    DOI: 10.1520/D7933-15

    Citation Format

    ASTM D7933-15, Standard Test Method for Engine Coolant Stagnation in Flux-Brazed Aluminum Heat Exchangers, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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