ASTM D7894 / D7894M - 19

    Standard Test Method for Thermal Endurance of Coating Powders Used for Integral Bus Bar Insulation Systems

    Active Standard ASTM D7894 / D7894M | Developed by Subcommittee: D09.01

    Book of Standards Volume: 10.02


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    Significance and Use

    5.1 A major factor affecting the life of insulating materials is thermal degradation. It is possible that other factors, such as moisture and vibration, will cause failures after the material has been weakened by thermal degradation.

    5.2 Electrical insulation is effective in electrical equipment only as long as it retains its physical and electrical integrity. The following are potential indicators of thermal degradation: weight change, porosity, crazing, and generally a reduction in flexibility. Thermal degradation is usually accompanied by an ultimate reduction in dielectric breakdown.

    5.3 This test method is useful in determining the thermal endurance of coating powders applied over a copper or aluminum substrate material.

    1. Scope

    1.1 This test method provides a procedure for evaluating thermal endurance of coating powders by determining the length of aging time at selected elevated temperatures required to achieve dielectric breakdown at room temperature at a pre-determined proof voltage. Thermal endurance is expressed in terms of a temperature index.

    1.2 This test method is applicable to insulating powders used over a substrate material of copper or aluminum.

    1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems is likely to result in non-conformance with the standard.

    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. Specific precautionary statements are given in 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

    D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies

    D1711 Terminology Relating to Electrical Insulation

    D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

    IEEE Document

    IEEE 101A Simplified Method for Calculation of the Regression Line


    ICS Code

    ICS Number Code 29.060.10 (Wires); 29.080.01 (Insulation in general); 87.040 (Paints and varnishes)

    UNSPSC Code

    UNSPSC Code 30140000(Insulation)


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

    DOI: 10.1520/D7894_D7894M-19

    Citation Format

    ASTM D7894 / D7894M-19, Standard Test Method for Thermal Endurance of Coating Powders Used for Integral Bus Bar Insulation Systems, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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