Standard Active Last Updated: Sep 07, 2017
ASTM D4881-05(2017)

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

Significance and Use

4.1 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

 Jig for Forming Wire Jig for Forming Wire


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.

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.

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Book of Standards Volume: 10.02
Developed by Subcommittee: D09.01
Pages: 2
DOI: 10.1520/D4881-05R17
ICS Code: 29.060.10