ASTM D3145-20
(Test Method)Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method
Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method
SIGNIFICANCE AND USE
5.1 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 D1932 and D3251 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.
5.2 This test method is useful for research and product qualifications purposes.
SCOPE
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 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.
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. For a specific precautionary statement, see 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.
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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.
Designation: D3145 − 20
Standard Test Method for
Thermal Endurance of Electrical Insulating Varnishes by
1
Helical Coil Method
This standard is issued under the fixed designation D3145; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* D2307 Test Method for Thermal Endurance of Film-
Insulated Round Magnet Wire
1.1 Thistestmethodcoversthedeterminationofthethermal
D2519 Test Method for Bond Strength of Electrical Insulat-
endurance of electrical insulating varnishes alone or in com-
ing Varnishes by the Helical Coil Test
binations with magnet wire insulation. Changes in the helical
D3251 Test Method for Thermal Endurance Characteristics
coil bond strength are used as the test criteria. The coils are
of Electrical Insulating Varnishes Applied Over Film-
made from bare aluminum or copper wire, or from film- or
Insulated Magnet Wire
fiber-insulated magnet wire.
D5423 Specification for Forced-Convection Laboratory Ov-
1.2 The values stated in inch-pound units are to be regarded
ens for Evaluation of Electrical Insulation
as standard. The values given in parentheses are mathematical
2.2 International Electrotechnical Commission Publica-
conversions to SI units that are provided for information only
3
tion:
and are not considered standard.
IEC 60216-1 Guide for the Determination of Thermal En-
NOTE 1—There is no similar or equivalent IEC standard.
durance Properties of Electrical Insulation Materials (Part
1)
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Terminology
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
3.1 Definitions:
mine the applicability of regulatory limitations prior to use. 3.1.1 For definitions of terms used in the test method, refer
For a specific precautionary statement, see Section 7.
to Terminology D1711.
1.4 This international standard was developed in accor-
3.1.2 varnish, electrical insulating, n—aliquidresinsystem
dance with internationally recognized principles on standard-
that is applied to and cured on electrical components providing
ization established in the Decision on Principles for the
electrical, mechanical, and environmental protection.
Development of International Standards, Guides and Recom-
3.1.2.1 Discussion—There are two types of electrical insu-
mendations issued by the World Trade Organization Technical
latingvarnish:solvent-containingandsolventless.Thesolvent-
Barriers to Trade (TBT) Committee.
containing varnish is a solution, dispersion, or emulsion of a
polymer or mixture of polymers in a volatile, nonreactable
2. Referenced Documents
liquid. The solventless type is a liquid resin system free of
2
volatile, nonreactable solvents.
2.1 ASTM Standards:
D1711 Terminology Relating to Electrical Insulation
3.2 Definitions of Terms Specific to This Standard:
D1932 Test Method for Thermal Endurance of Flexible
3.2.1 bond strength, n—a measure of the force required to
Electrical Insulating Varnishes
separate surfaces which have been bonded together.
3.2.2 magnet wire, n—a metal electrical conductor, covered
with electrical insulation, for use in the assembly of electrical
1
This test method is under the jurisdiction of ASTM Committee D09 on
inductive apparatus such as coils for motors, transformers,
Electrical and Electronic Insulating Materials and is the direct responsibility of
generators, relays, magnets, and so forth.
Subcommittee D09.01 on Electrical Insulating Products.
Current edition approved Aug. 1, 2020. Published September 2020. Originally
3.2.2.1 Discussion—The electrical insulation is usually
approved in 1973. Last previous edition approved in 2018 as D3145 – 18. DOI:
composed of a film covering formed from a magnet wire
10.1520/D3145-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1942
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3145 − 18 D3145 − 20
Standard Test Method for
Thermal Endurance of Electrical Insulating Varnishes by the
1
Helical Coil Method
This standard is issued under the fixed designation D3145; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
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 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.
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. For a specific precautionary statement, see 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1711 Terminology Relating to Electrical Insulation
D1932 Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes
D2307 Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
D3251 Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated
Magnet Wire
D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
3
2.2 International Electrotechnical Commission Publications:Publication:
IEC 60216-1 Guide for the Determination of Thermal Endurance Properties of Electrical Insulation Materials (Part 1)
1
This test method is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.01 on Electrical Insulating Products.
Current edition approved Nov. 1, 2018Aug. 1, 2020. Published November 2018September 2020. Originally approved in 1973. Last previous edition approved in 20132018
as D3145 – 13.D3145 – 18. DOI: 10.1520/D3145-18.10.1520/D3145-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D3145 − 20
3. Terminology
3.1 Definitions
3.1.1 For definitions of terms used in the test method, refer to Terminology D1711.
3.1 Definitions:
3.1.1 For definitions of terms used in the test method, refer to Terminology D1711.
3.1.2 varnish, electrical insulating, n— a liquid resin system that is applied to and cured on electrical components providing
electrical, mechanical, and environmental protection.
3.1.2.1 Discussion—
There are two types of electrical insulating varnish: solvent-containing and solventless. The solvent-containing varnish is a
solution, dispersion, or emulsion of a polymer or mixture of polymers in a volatile, nonreactable liquid. The solventless type is
a liquid resin system free of volatile, nonreactable solvents.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bond strength, n—a measure of the force require
...
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