ASTM D3251 - 04(2013)

    Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire

    Active Standard ASTM D3251 | Developed by Subcommittee: D09.01

    Book of Standards Volume: 10.02


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    Significance and Use

    5.1 Different combinations of varnishes and film-insulated magnet wire behave differently when exposed to elevated temperatures. This includes different varnishes tested with the same film-insulated magnet wire and a single varnish tested with different film-insulated magnet wire.

    5.2 This test method is used to determine the effect on the electrical properties of a varnish applied to film-insulated magnet wire when the combination is exposed to prescribed elevated temperatures.

    1. Scope

    1.1 This test method covers the determination of the thermal endurance characteristics of electrical insulating varnishes and film-insulated magnet wire in combination.

    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.

    Note 1This test method is equivalent to IEC 60172.


    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

    D115 Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation

    D1711 Terminology Relating to Electrical Insulation

    D2307 Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire

    IEC Standard

    IEC60172 Test Procedure for the determination of the temperature index of enameled winding wires Available from American National Standards Association, 25 W. 43rd St., 4th Floor, New York, NY 10036.


    ICS Code

    ICS Number Code 29.035.60 (Varnished fabrics)

    UNSPSC Code

    UNSPSC Code 26121509(Magnet wire)


    DOI: 10.1520/D3251-04R13

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