ASTM D4880-03
(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 the 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.
General Information
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Standards Content (Sample)
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An American National Standard
Designation:D4880 –03
Standard Test Method for
Salt Water Proofness of Insulating Varnishes Over
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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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 varnished, adj—referring to any item on to which
varnish has been applied and cured.
1.1 This test method covers the performance in a specified
water solution of an insulating varnish applied over enamelled
4. Significance and Use
magnet wire.
4.1 This test method is useful in determining the perfor-
1.2 The values stated in SI units are the 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
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2.1 ASTM Standards:
used. Lighting of the bulb or “blowing” of the fuse indicates
D 1676 Test Method for Testing Film-Insulated Magnet
failure.
Wire
5.1.2 The power supply shall provide a source of filtered
D 1711 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: For definitions of terms used in this test
specimens. The surrounding sodium chloride solution is at
method refer to Terminology D 1711.
ground potential. The ground connection, using an immersed
3.1.1 varnish, electrical insulating, n— a liquid resin sys-
electrode, is made using Nichrome, stainless steel, or other
tem that is applied to and cured on electrical components
non-corrosive wire. Do not use iron, carbon steel, copper, or
providing electrical, mechanical, and environmental protec-
brass (see Fig. 1).
tion.
5.2 An appropriate container shall be selected for the
3.1.1.1 Discussion—There are two types of electrical insu-
sodium chloride solution. Fit it with a cover to prevent
lating varnish— solvent–containing and solventless. The
evaporation of the solution.
solvent-containing varnish is solution, dispersion, or emulsion
of a polymer or a mixture of polymers in a volatile, nonre-
6. Safety Precautions
actable liquid.The solventless type is a liquid resin system free
6.1 Do not use varnish at temperatures above the flash point
of volatile, nonreactable solvents.
when inadequate ventilation, and possibility of flames or
sparks exist. Store varnish in sealed containers. These precau-
1
tions shall also apply to the handling of the reagents and
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of solvents called for in this test method.
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
6.2 (Warning—Lethal voltages are a potential hazard dur-
lating Compounds.
ing the performance of this test. It is essential that the test
Current edition approved Oct. 1, 2003. Published November 2003. Originally
apparatus, and all associated equipment electrically connected
approved in 1988. Last previous edition approved in 1998 as D 4880 – 94 (1998).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to it, be properly designed and installed for safe operation.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Solidly ground all electrically conductive parts which it is
Standards volume information, refer to the standard’s Document Summary page on
possible for a person to contact during the test. Provide means
the ASTM website.
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D4880 –03
them at a rate of approximately 100 mm/min (4 in./min). Drain
the specimens for a minimum of 10 min. Cure according
...
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