ASTM D4880-18
(Test Method)Standard Test Method for Salt Water Proofness of Insulating Varnishes Over Enamelled Magnet Wire
Standard Test Method for Salt Water Proofness of Insulating Varnishes Over Enamelled Magnet Wire
SIGNIFICANCE AND USE
4.1 This test method is useful in determining the performance of varnishes over enamelled magnet wire when subjected to the specified sodium chloride solution. It is useful in evaluating the resistance of varnished magnet wire to a diluted sodium chloride solution under applied voltage.
SCOPE
1.1 This test method covers the electrical performance in a specified water solution of an insulating varnish applied over enamelled magnet wire.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered 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. Specific precautionary statements are given in Section 6.
Note 1: There is no IEC method equivalent to this standard.
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: D4880 − 18
Standard Test Method for
Salt Water Proofness of Insulating Varnishes Over
1
Enamelled Magnet Wire
This standard is issued under the fixed designation D4880; 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.
1. Scope* 3.1.2 varnish, electrical insulating, n—aliquidresinsystem
that is applied to and cured on electrical components providing
1.1 This test method covers the electrical performance in a
electrical, mechanical, and environmental protection.
specified water solution of an insulating varnish applied over
3.1.2.1 Discussion—There are two types of electrical insu-
enamelled magnet wire.
lating varnish— solvent–containing and solventless. The
1.2 The values stated in SI units are to be regarded as
solvent-containing varnish is solution, dispersion, or emulsion
standard. The values given in parentheses are mathematical
of a polymer or a mixture of polymers in a volatile, nonre-
conversions to inch-pound units that are provided for informa-
actable liquid.The solventless type is a liquid resin system free
tion only and are not considered standard.
of volatile, nonreactable solvents.
1.3 This standard does not purport to address all of the
3.1.3 varnished, adj—referring to any item on to which
safety concerns, if any, associated with its use. It is the
varnish has been applied and cured.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4. Significance and Use
mine the applicability of regulatory limitations prior to use.
4.1 This test method is useful in determining the perfor-
Specific precautionary statements are given in Section 6.
mance of varnishes over enamelled magnet wire when sub-
jected to the specified sodium chloride solution. It is useful in
NOTE 1—There is no IEC method equivalent to this standard.
evaluating the resistance of varnished magnet wire to a diluted
1.4 This international standard was developed in accor-
sodium chloride solution under applied voltage.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Apparatus
Development of International Standards, Guides and Recom-
5.1 Description of Electrical Apparatus :
mendations issued by the World Trade Organization Technical
5.1.1 The apparatus shall contain devices for limiting or
Barriers to Trade (TBT) Committee.
interrupting the current to each specimen whenever a failure
1
2. Referenced Documents occurs. In particular, 7.5Wlight bulbs or ⁄10Afuses have been
2
used. Lighting of the bulb or “blowing” of the fuse indicates
2.1 ASTM Standards:
failure.
D1676 Test Methods for Film-Insulated Magnet Wire
5.1.2 The power supply shall provide a source of filtered
D1711 Terminology Relating to Electrical Insulation
120 6 2 V dc which drops by less than 2 V when a current of
0.5 A is drawn.
3. Terminology
5.1.3 A positive polarity of 120 V dc is applied to the
3.1 Definitions:
specimens. The surrounding sodium chloride solution is at
3.1.1 For definitions of terms used in this test method refer
ground potential. The ground connection, using an immersed
to Terminology D1711.
electrode, is made using Nichrome, stainless steel, or other
non-corrosive wire. Do not use iron, carbon steel, copper, or
brass (see Figs. 1 and 2).
1
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
5.2 An appropriate container shall be selected for the
Subcommittee D09.01 on Electrical Insulating Products.
sodium chloride solution. Fit it with a cover to prevent
Current edition approved Nov. 1, 2018. Published November 2018. Originally
evaporation of the solution.
approved in 1988. Last previous edition approved in 2014 as D4880 – 14. DOI:
10.1520/D4880-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Safety Precautions
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1 Do not use varnish at temperatures above the flash point
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. when inadequate ventilation, and possibility of flames or
*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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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: D4880 − 14 D4880 − 18
Standard Test Method for
Salt Water Proofness of Insulating Varnishes Over
1
Enamelled Magnet Wire
This standard is issued under the fixed designation D4880; 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.
1. Scope*
1.1 This test method covers the electrical performance in a specified water solution of an insulating varnish applied over
enamelled magnet wire.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions
to inch-pound units that are provided for information only and are not considered 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 6.
NOTE 1—There is no IEC method equivalent to this standard.
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:
D1676 Test Methods for Film-Insulated Magnet Wire
D1711 Terminology Relating to Electrical Insulation
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this 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
solution, dispersion, or emulsion of a polymer or a mixture of polymers in a volatile, nonreactable liquid. The solventless type is
a liquid resin system free of volatile, nonreactable solvents.
3.1.3 varnished, adj—referring to any item on to which varnish has been applied and cured.
4. Significance and Use
4.1 This test method is useful in determining the performance of varnishes over enamelled magnet wire when subjected to the
specified sodium chloride solution. It is useful in evaluating the resistance of varnished magnet wire to a diluted sodium chloride
solution under applied voltage.
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 CompoundsProducts.
Current edition approved May 15, 2014Nov. 1, 2018. Published May 2014November 2018. Originally approved in 1988. Last previous edition approved in 20082014 as
D4880 – 08.D4880 – 14. DOI: 10.1520/D4880-14.10.1520/D4880-18.
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.
*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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D4880 − 18
5. Apparatus
5.1 Description of Electrical Apparatus :
5.1.1 The apparatus shall contain devices for limiting or interrupting the current to each specimen whenever a failure occurs.
1
In particular, 7.5 W light bulbs or ⁄10 A fuses have been used. Lighting of the bulb or “blowing” of the fuse indicates failure.
5.1.2 The power supply shall provide a source of filtered 120 6 2 V dc which drops by less than 2 V when a current of 0.5
A is drawn.
5.1.3 A positive polarity of 120 V dc is applied to the specimens. The surrounding sodium chloride solution is at ground
potential. The ground connection, using an immersed electrode, is made using Nichrome, stainless steel, or other non-corrosive
wire. Do not use iron, carbon steel, copper, or brass (see Fig. 1Figs. 1 and 2).
5.
...
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