ASTM-D4882 Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Twisted-Coil Test

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



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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 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.

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. A specific precautionary statement is given in Section 7.

1.4 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.

Significance and Use

5.1 Values obtained by flexural test provides 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.


bond strength; electrical insulating; magnet wire; twisted coil; varnish ;; ICS Number Code 29.035.60 (Varnished fabrics)

To find similar documents by ASTM Volume:

10.02 (Electrical Insulation (II): D2518 - latest)

To find similar documents by classification:

29.035.60 (Varnished fabrics)

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Publication Date

Nov. 15, 2017

Document Type

Test Method

Page Count

4 pages

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