ASTM D2519-19a
(Test Method)Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
SIGNIFICANCE AND USE
5.1 Values obtained by flexural tests can provide information with regard to the bond strength of the particular varnish, in combination with a particular wire, when measured under conditions described in this test method.
SCOPE
1.1 This test method covers determination of the bond strength of an electrical insulating varnish when applied to a helical coil. The helical coil can be made from bare aluminum or copper wire or from film or fiber-insulated magnet wire. Helical coils made from bare aluminum or bare copper wire will yield values of bond strength for the varnish when applied to bare metal conductors. The use of film or fiber-insulated magnet wire will show values for that particular combination of insulation and varnish.
1.2 The values stated in SI units are to be regarded as 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 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: D2519 − 19a
Standard Test Method for
Bond Strength of Electrical Insulating Varnishes by the
1
Helical Coil Test
This standard is issued under the fixed designation D2519; 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* D6054 Practice for Conditioning Electrical Insulating Mate-
3
rials for Testing (Withdrawn 2012)
1.1 This test method covers determination of the bond
E691 Practice for Conducting an Interlaboratory Study to
strength of an electrical insulating varnish when applied to a
Determine the Precision of a Test Method
helical coil. The helical coil can be made from bare aluminum
or copper wire or from film or fiber-insulated magnet wire.
3. Terminology
Helical coils made from bare aluminum or bare copper wire
3.1 Definitions:
will yield values of bond strength for the varnish when applied
3.1.1 For definitions of terms used in this test method refer
to bare metal conductors. The use of film or fiber-insulated
to Terminology D1711.
magnet wire will show values for that particular combination
3.1.2 bond strength—a measure of the force required to
of insulation and varnish.
separate surfaces which have been bonded together.
1.2 The values stated in SI units are to be regarded as the
3.2 Definitions of Terms Specific to This Standard:
standard. The values given in parentheses are for information
3.2.1 event time—the time between initial application of a
only.
physical or electrical stress and failure of the specimen under
1.3 This standard does not purport to address all of the
test.
safety concerns, if any, associated with its use. It is the
3.2.2 response time—the time required for an indicating or
responsibility of the user of this standard to establish appro-
recording device to react to change in stress on a specimen
priate safety, health, and environmental practices and deter-
under test.
mine the applicability of regulatory limitations prior to use.
See Section 7.
3.2.3 varnish, electrical insulating, n—a liquid resin system
1.4 This international standard was developed in accor-
that is applied to and cured on electrical components providing
dance with internationally recognized principles on standard-
electrical, mechanical, and environmental protection.
ization established in the Decision on Principles for the
3.2.3.1 Discussion—There are two types of electrical insu-
Development of International Standards, Guides and Recom-
lating varnish: solvent-containing and solventless.The solvent-
mendations issued by the World Trade Organization Technical
containing varnish is a solution, dispersion, or emulsion of a
Barriers to Trade (TBT) Committee.
polymer or mixture of polymers in a volatile, nonreactable
liquid. The solventless type is a liquid resin system free of
2. Referenced Documents
volatile, nonreactable solvents.
2
2.1 ASTM Standards:
D115 Test Methods for Testing Solvent Containing Var-
4. Summary of Test Method
nishes Used for Electrical Insulation
4.1 Flexural strength tests are made on varnish-treated
D1711 Terminology Relating to Electrical Insulation
helical coils to determine the force required to break the coil
under specified conditions.
1
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
5. Significance and Use
Subcommittee D09.01 on Electrical Insulating Products.
Current edition approved Nov. 1, 2019. Published November 2019. Originally
5.1 Values obtained by flexural tests can provide informa-
approved in 1966. Last previous edition approved in 2019 as D2519 – 19. DOI:
tion with regard to the bond strength of the particular varnish,
10.1520/D2519-19A.
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 The last approved version of this historical standard is referenced on
the ASTM website. www.astm.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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D2519 − 19a
in combination with a particular wire, when measured under chamber to within 62°C of the des
...
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: D2519 − 19 D2519 − 19a
Standard Test Method for
Bond Strength of Electrical Insulating Varnishes by the
1
Helical Coil Test
This standard is issued under the fixed designation D2519; 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 determination of the bond strength of an electrical insulating varnish when applied to a helical coil.
The helical coil can be made from bare aluminum or copper wire or from film or fiber-insulated magnet wire. Helical coils made
from bare aluminum or bare copper wire will yield values of bond strength for the varnish when applied to bare metal conductors.
The use of film or fiber-insulated magnet wire will show values for that particular combination of insulation and varnish.
1.2 The values stated in SI units are to be regarded as 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use. 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:
D115 Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
3
D6054 Practice for Conditioning Electrical Insulating Materials for Testing (Withdrawn 2012)
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 For definitions of other terms relating to electrical insulation, see terms used in this test method refer to Terminology
D1711.
3.1.2 bond strength—a measure of the force required to separate surfaces which have been bonded together.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 event time—the time between initial application of a physical or electrical stress and failure of the specimen under test.
3.2.2 response time—the time required for an indicating or recording device to react to change in stress on a specimen under
test.
3.2.3 varnish, electrical insulating, n—a liquid resin system that is applied to and cured on electrical components providing
electrical, mechanical, and environmental protection.
3.2.3.1 Discussion—
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 March 1, 2019Nov. 1, 2019. Published March 2019November 2019. Originally approved in 1966. Last previous edition approved in 20182019
as D2519 – 18.D2519 – 19. DOI: 10.1520/D2519-19.10.1520/D2519-19A.
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
The last approved version of this historical standard is referenced on www.astm.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 ----------------------
D2519 − 19a
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.
4. Summary of Test Method
4.1 Flexural strength tests are made on varnish-treated helical coils to determine the force required to break the coil under
specified conditions.
5. Significanc
...
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