ASTM D3145-08
(Test Method)Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method
Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method
SIGNIFICANCE AND USE
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.
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 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.
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Designation: D3145 − 08 AnAmerican National Standard
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 Department of Defense.
1. Scope* Insulated Magnet Wire
D3850 Test Method for RapidThermal Degradation of Solid
1.1 Thistestmethodcoversthedeterminationofthethermal
Electrical Insulating Materials By Thermogravimetric
endurance of electrical insulating varnishes alone or in com-
Method (TGA)
binations with magnet wire insulation. Changes in the helical
D5423 Specification for Forced-Convection Laboratory Ov-
coil bond strength are used as the test criteria. The coils are
ens for Evaluation of Electrical Insulation
made from bare aluminum or copper wire, or from film- or
D6054 Practice for Conditioning Electrical Insulating Mate-
fiber-insulated magnet wire.
rials for Testing
1.2 The values stated in inch-pound units are to be regarded
2.2 International Electrotechnical Commission Publica-
as standard. The values given in parentheses are mathematical
3
tions:
conversions to SI units that are provided for information only
IEC 60216-1 Guide for the Determination of Thermal En-
and are not considered standard.
durance Properties of Electrical Insulation Materials (Part
NOTE 1—There is no similar or equivalent IEC standard. 1)
1.3 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1 Definitions
priate safety and health practices and determine the applica- 3.1.1 For definitions of terms used in the test method, refer
bility of regulatory limitations prior to use. For a specific to Terminology D1711.
precautionary statement, see Section 7.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bond strength, n—a measure of the force required to
2. Referenced Documents
separate surfaces which have been bonded together.
2
2.1 ASTM Standards:
3.2.2 magnet wire, n—a metal electrical conductor, covered
D1711 Terminology Relating to Electrical Insulation
with electrical insulation, for use in the assembly of electrical
D1932 Test Method for Thermal Endurance of Flexible
inductive apparatus such as coils for motors, transformers,
Electrical Insulating Varnishes
generators, relays, magnets, etc.
D2307 Test Method for Thermal Endurance of Film-
3.2.2.1 Discussion—The electrical insulation is usually
Insulated Round Magnet Wire
composed of a film covering formed from a magnet wire
D2519 Test Method for Bond Strength of Electrical Insulat-
enamel applied over a bare conductor. In some specific
ing Varnishes by the Helical Coil Test
applications, fibrous coverings, either taped or linear filament
D3251 Test Method for Thermal Endurance Characteristics
served, are also used as electrical insulation.
of Electrical Insulating Varnishes Applied Over Film-
3.2.3 varnish, electrical insulating, n—aliquidresinsystem
that is applied to and cured on electrical components providing
1
This test method is under the jurisdiction of ASTM Committee D09 on
electrical, mechanical and environmental protection.
Electrical and Electronic Insulating Materials and is the direct responsibility of
3.2.3.1 Discussion—There are two types of electrical insu-
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
ing Compounds. lating varnishes—solvent-containing and solventless. Solvent-
Current edition approved May 1, 2008. Published June 2008. Originally
containing types are solutions, dispersions or emulsions of a
approved in 1973. Last previous edition approved in 2003 as D3145 – 03. DOI:
polymer or a mixture of polymers in a volatile, nonreactable
10.1520/D3145-08.
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 19428-2959. United States
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D3145 − 08
liquid. Solventless types are liquid resin systems free of 9. Selection of Test Tem
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
An American National Standard
Designation:D3145–03 Designation:D3145–08
Standard Test Method for
Thermal Endurance of Electrical Insulating Varnishes by the
1
Helical Coil Method
This standard is issued under the fixed designation D 3145; 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 Department of Defense.
1. Scope*
1.1 This test method covers the determination of the thermal endurance of electrical insulating varnishes alone or in
combinationswithmagnetwireinsulation.Changesinthehelicalcoilbondstrengthareusedasthetestcriteria.Thecoilscanbeare
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.
1.3The values stated in SI units are the standard. The values given in parentheses are for information only. .
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1711 Terminology Relating to Electrical Insulation
D 1932 Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes
D 2307 Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
D 2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
D 3251 Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated
Magnet Wire
D 3850 Test Method for Rapid Thermal Degradation of Solid Electrical Insulating Materials byBy Thermogravimetric Method
(TGA)
D 5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
D 6054 Practice for Conditioning Electrical Insulating Materials for Testing
3
2.2 International Electrotechnical Commission Publications:
IEC 60216-1 Guide for the Determination of Thermal Endurance Properties of Electrical Insulation Materials (Part 1)
3. Terminology
3.1 Definitions
3.1.1 For definitions of terms used in the test method, refer to Terminology D 1711.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bond strength, n—a measure of the force required to 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
inductive apparatus such as coils for motors, transformers, generators, relays, magnets, etc.
3.2.2.1 Discussion—Theelectricalinsulationisusuallycomposedofafilmcoveringformedfromamagnetwireenamelapplied
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 Varnishes, Powders,Powders and Encapsulating Compounds.
Current edition approved Dec.May 1, 2003.2008. Published January 2004.June 2008. Originally approved in 1973. Last previous edition approved in 20012003 as
D 3145 – 013.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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
---------------------- Page: 1 ----------------------
D3145–08
over a bare conductor. In some specific applications, fibrous coverings, either taped or linear filament served, are also used as
electrical insulation.
3.2.3 varnish, electrical insulating, n— a liquid resin system that is applied to and cured on electrical component
...
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