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ASTM D3145-08

Historical Revision

Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method

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1.1 This test method covers the determination of the thermal endurance of electrical insulating varnishes alone or in combinations with magnet wire insulation. Changes in the helical coil bond strength are used as the test criteria. The coils are made from bare aluminum or copper wire, or from film- or fiber-insulated magnet wire.

1.2 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. For a specific precautionary statement, see Section 7.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

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


This test method is used to determine the effect of exposure to elevated temperatures on the bond strength of combinations of magnet wire insulations and electrical insulating varnishes. The results are used as a guide for the comparison and selection of varnishes and combinations of varnishes and magnet wire insulation for specific applications. Test Methods D 1932, D 3251, and D 3850 describe additional tests for determining the thermal endurance of insulating varnishes. A comprehensive evaluation of thermal characteristics includes a comparison of the thermal endurance determined in these different ways.

This test method is useful for research and product qualifications purposes.

SDO ASTM: ASTM International
Document Number D3145
Publication Date May 1, 2008
Language en - English
Page Count 3
Revision Level 08
Supercedes
Committee D09.01
Publish Date Document Id Type View
Aug. 1, 2020 D3145-20 Revision
Nov. 1, 2018 D3145-18 Revision
Nov. 1, 2013 D3145-13 Revision
May 1, 2008 D3145-08 Revision
Dec. 1, 2003 D3145-03 Revision
Nov. 10, 2001 D3145-97 Revision
Nov. 10, 2001 D3145-01 Revision