ASTM D3145-13
(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
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 D3251describe 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 and health practices and determine the applicability of regulatory limitations prior to use. For a specific precautionary statement, see Section 7.
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Designation: D3145 − 13
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* D3251 Test Method for Thermal Endurance Characteristics
of Electrical Insulating Varnishes Applied Over Film-
1.1 Thistestmethodcoversthedeterminationofthethermal
Insulated Magnet Wire
endurance of electrical insulating varnishes alone or in com-
D5423 Specification for Forced-Convection Laboratory Ov-
binations with magnet wire insulation. Changes in the helical
ens for Evaluation of Electrical Insulation
coil bond strength are used as the test criteria. The coils are
made from bare aluminum or copper wire, or from film- or 2.2 International Electrotechnical Commission Publica-
3
tions:
fiber-insulated magnet wire.
IEC 60216-1 Guide for the Determination of Thermal En-
1.2 The values stated in inch-pound units are to be regarded
durance Properties of Electrical Insulation Materials (Part
as standard. The values given in parentheses are mathematical
1)
conversions to SI units that are provided for information only
and are not considered standard.
3. Terminology
NOTE 1—There is no similar or equivalent IEC standard.
3.1 Definitions
1.3 This standard does not purport to address all of the
3.1.1 For definitions of terms used in the test method, refer
safety concerns, if any, associated with its use. It is the
to Terminology D1711.
responsibility of the user of this standard to establish appro-
3.2 Definitions of Terms Specific to This Standard:
priate safety and health practices and determine the applica-
3.2.1 bond strength, n—a measure of the force required to
bility of regulatory limitations prior to use. For a specific
separate surfaces which have been bonded together.
precautionary statement, see Section 7.
3.2.2 magnet wire, n—a metal electrical conductor, covered
2. Referenced Documents with electrical insulation, for use in the assembly of electrical
2 inductive apparatus such as coils for motors, transformers,
2.1 ASTM Standards:
generators, relays, magnets, etc.
D618 Practice for Conditioning Plastics for Testing
3.2.2.1 Discussion—The electrical insulation is usually
D1711 Terminology Relating to Electrical Insulation
composed of a film covering formed from a magnet wire
D1932 Test Method for Thermal Endurance of Flexible
enamel applied over a bare conductor. In some specific
Electrical Insulating Varnishes
applications, fibrous coverings, either taped or linear filament
D2307 Test Method for Thermal Endurance of Film-
served, are also used as electrical insulation.
Insulated Round Magnet Wire
3.2.3 varnish, electrical insulating, n—aliquidresinsystem
D2519 Test Method for Bond Strength of Electrical Insulat-
that is applied to and cured on electrical components providing
ing Varnishes by the Helical Coil Test
electrical, mechanical and environmental protection.
3.2.3.1 Discussion—There are two types of electrical insu-
lating varnishes—solvent-containing and solventless. Solvent-
1
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of containing types are solutions, dispersions or emulsions of a
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
polymer or a mixture of polymers in a volatile, nonreactable
ing Compounds.
liquid. Solventless types are liquid resin systems free of
Current edition approved Nov. 1, 2013. Published December 2013. Originally
volatile, nonreactable solvents.
approved in 1973. Last previous edition approved in 2008 as D3145 – 08. DOI:
10.1520/D3145-13.
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
1
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D3145 − 13
4. Summary of Test Method 25°C higher than the estimated temperature index. Separate
exposure temperatures from each other by at least 10°C,
4.1 Flexural stre
...
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 − 08 D3145 − 13 An American 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 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 and health practices and determine the applicability of regulatory
limitations prior to use. For a specific precautionary statement, see Section 7.
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
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
D3850 Test Method for Rapid Thermal Degradation of Solid Electrical Insulating Materials By Thermogravimetric Method
(TGA)
D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
3
D6054 Practice for Conditioning Electrical Insulating Materials for Testing (Withdrawn 2012)
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 D1711.
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.
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 and Encapsulating Compounds.
Current edition approved May 1, 2008Nov. 1, 2013. Published June 2008December 2013. Originally approved in 1973. Last previous edition approved in 20032008 as
D3145 – 03.D3145 – 08. DOI: 10.1520/D3145-08.10.1520/D3145-13.
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
---------------------- Page: 1 ----------------------
D3145 − 13
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—
The electrical insulation is usually composed of a film covering formed from a magnet wire enamel applied 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 cu
...
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