ASTM D4880-08
(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
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 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 and health 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.
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Designation: D4880 − 08 AnAmerican National Standard
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* of a polymer or a mixture of polymers in a volatile, nonre-
actable liquid.The solventless type is a liquid resin system free
1.1 This test method covers the performance in a specified
of volatile, nonreactable solvents.
water solution of an insulating varnish applied over enamelled
3.1.3 varnished, adj—referring to any item on to which
magnet wire.
varnish has been applied and cured.
1.2 The values stated in SI units are to be regarded as
standard. The values given in parentheses are mathematical
4. Significance and Use
conversions to inch-pound units that are provided for informa-
4.1 This test method is useful in determining the perfor-
tion only and are not considered standard.
mance of varnishes over enamelled magnet wire when sub-
1.3 This standard does not purport to address all of the
jected to the specified sodium chloride solution. It is useful in
safety concerns, if any, associated with its use. It is the
evaluating the resistance of varnished magnet wire to a diluted
responsibility of the user of this standard to establish appro-
sodium chloride solution under applied voltage.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Specific precau-
5. Apparatus
tionary statements are given in Section 6.
5.1 Description of Electrical Apparatus :
NOTE 1—There is no IEC method equivalent to this standard.
5.1.1 The apparatus shall contain devices for limiting or
interrupting the current to each specimen whenever a failure
2. Referenced Documents
1
occurs. In particular, 7.5Wlight bulbs or ⁄10Afuses have been
2
2.1 ASTM Standards:
used. Lighting of the bulb or “blowing” of the fuse indicates
D1676 Test Methods for Film-Insulated Magnet Wire
failure.
D1711 Terminology Relating to Electrical Insulation
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
3. Terminology
0.5 A is drawn.
3.1 Definitions:
5.1.3 A positive polarity of 120 V dc is applied to the
3.1.1 For definitions of terms used in this test method refer
specimens. The surrounding sodium chloride solution is at
to Terminology D1711.
ground potential. The ground connection, using an immersed
3.1.2 varnish, electrical insulating, n—aliquidresinsystem
electrode, is made using Nichrome, stainless steel, or other
that is applied to and cured on electrical components providing
non-corrosive wire. Do not use iron, carbon steel, copper, or
electrical, mechanical, and environmental protection.
brass (see Fig. 1).
3.1.2.1 Discussion—There are two types of electrical insu-
5.2 An appropriate container shall be selected for the
lating varnish— solvent–containing and solventless. The
sodium chloride solution. Fit it with a cover to prevent
solvent-containing varnish is solution, dispersion, or emulsion
evaporation of the solution.
1
This test method is under the jurisdiction of ASTM Committee D09 on
6. Safety Precautions
Electrical and Electronic Insulating Materials and is the direct responsibility of
6.1 Do not use varnish at temperatures above the flash point
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
ing Compounds.
when inadequate ventilation, and possibility of flames or
Current edition approved May 1, 2008. Published June 2008. Originally
sparks exist. Store varnish in sealed containers. These precau-
approved in 1988. Last previous edition approved in 2003 as D4880 – 03. DOI:
tions shall also apply to the handling of the reagents and
10.1520/D4880-08.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or solvents called for in this test method.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.2 Warning—Lethalvoltagesareapotentialhazardduring
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the performance of this test. It is essential that the test
*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 ----------------------
D4880 − 08
withdrawn at a rate of approximately 100 mm/min (4 in./min).
Use solventless varnish as received.
7.4.2 Dip nine twisted specimens in the va
...
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.
An American National Standard
Designation:D4880 –03 Designation:D4880–08
Standard Test Method for
Salt Water Proofness of Insulating Varnishes Over
1
Enamelled Magnet Wire
This standard is issued under the fixed designation D 4880; 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 performance in a specified water solution of an insulating varnish applied over enamelled
magnet wire.
1.2The values stated in SI units are the standard.
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 and health 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1676 Test Methods for Testing Film-Insulated Magnet Wire
D 1711 Terminology Relating to Electrical Insulation
3. Terminology
3.1 Definitions: For definitions of terms used in this test method refer to Terminology D 1711.
3.1.1 varnish, electrical insulating, n— a liquid resin system that is applied to and cured on electrical components providing
electrical, mechanical, and environmental protection.
3.1.1.1 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.
3.1.2 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.
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
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 Oct.May 1, 2003.2008. Published November 2003.June 2008. Originally approved in 1988. Last previous edition approved in 19982003 as
D4880–94 (1998).D 4880 – 03.
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.
*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 ----------------------
D4880–08
wire. Do not use iron, carbon steel, copper, or brass (see Fig. 1).
5.2 An appropriate container shall be selected for the sodium chloride solution. Fit it with a cover to prevent evaporation of the
solution.
6. Safety Precautions
6.1 Do not use varnish at temperatures above the flash point when inadequate ventilation, and possibility of flames or sparks
exist. Store varnish in sealed cont
...
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