ASTM D4881 - 05(2012)

    Standard Test Method for Thermal Endurance of Varnished Fibrous- or Film-Wrapped Magnet Wire

    Active Standard ASTM D4881 | Developed by Subcommittee: D09.01

    Book of Standards Volume: 10.02


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    Significance and Use

    Individual varnishes behave differently when applied to the same fibrous- or film-wrapped magnet wire when exposed to elevated temperatures. Likewise, a varnish does not always behave the same when applied to different types of fibrous or film-wrapped magnet wires and when exposed to elevated temperatures.


    FIG. 1 Jig for Forming Wire

    1. Scope

    1.1 This test method covers the determination of thermal endurance of rectangular and square fibrous- or film-wrapped magnet wire coated with an insulating varnish.

    1.2 The values given in SI units are the standard. The values given in parentheses are for information only.

    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. A specific precautionary statement is given in Section 5.

    Note 1—There is no similar or equivalent IEC Standard.


    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

    D1711 Terminology Relating to Electrical Insulation

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

    D3353 Test Methods for Fibrous-Insulated Magnet Wire


    ICS Code

    ICS Number Code 29.060.10 (Wires)

    UNSPSC Code

    UNSPSC Code 31211707(Varnishes); 26121509(Magnet wire)


    Referencing This Standard

    DOI: 10.1520/D4881-05R12

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D4881-05(2012), Standard Test Method for Thermal Endurance of Varnished Fibrous- or Film-Wrapped Magnet Wire, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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