ASTM D4882 - 05(2012)

    Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Twisted-Coil Test

    Active Standard ASTM D4882 | Developed by Subcommittee: D09.01

    Book of Standards Volume: 10.02


      Format Pages Price  
    PDF 3 $37.00   ADD TO CART
    Hardcopy (shipping and handling) 3 $37.00   ADD TO CART


    Significance and Use

    Values obtained by flexural test can provide information with regard to the bond strength of the particular varnish in combination with a particular type of magnet wire, when measured under conditions described in this test method.

    1. Scope

    1.1 This test method covers the determination of the bond strength of an electrical insulating varnish when applied to a twisted coil of film-insulated magnet wire. The use of a particular type of film-insulated wire will show the values for that combination of film coating and varnish.

    1.2 This standard does not purport to address all, if any, 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 7.

    1.3 The values stated in inch-pound units are the standard. The values given in parentheses are for information only.

    Note 1—Although this standard and Method C of IEC 61033 differ in approach or detail, data obtained using either are technically equivalent.


    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

    D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test

    D6054 Practice for Conditioning Electrical Insulating Materials for Testing

    IEC Standard


    ICS Code

    ICS Number Code 29.035.60 (Varnished fabrics)

    UNSPSC Code

    UNSPSC Code 31211707(Varnishes)


    DOI: 10.1520/D4882-05R12

    ASTM International is a member of CrossRef.

    ASTM D4882

    Citing ASTM Standards
    Back to Top