ASTM D4880-94(1998)
(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
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 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.
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Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: D 4880 – 94(Reapproved 1998) An American National Standard
Standard Test Method for
Salt Water Proofness of Insulating Varnishes Over
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 jected to the specified sodium chloride solution. It is useful in
evaluating the resistance of varnished magnet wire to a diluted
1.1 This test method covers the performance in a specified
sodium chloride solution under applied voltage.
water solution of an insulating varnish applied over enamelled
magnet wire.
5. Apparatus
1.2 The values stated in SI units are the standard.
5.1 Description of Electrical Apparatus:
1.3 This standard does not purport to address all of the
5.1.1 The apparatus shall contain devices for limiting or
safety concerns, if any, associated with its use. It is the
interrupting the current to each specimen whenever a failure
responsibility of the user of this standard to establish appro-
occurs. In particular, 7.5 W light bulbs or ⁄10A fuses have been
priate safety and health practices and determine the applica-
used. Lighting of the bulb or “blowing” of the fuse indicates
bility of regulatory limitations prior to use. Specific precau-
failure.
tionary statements are given in Section 6.
5.1.2 The power supply shall provide a source of filtered
2. Referenced Documents 120 6 2 V dc which drops by less than 2 V when a current of
0.5 A is drawn.
2.1 ASTM Standards:
5.1.3 A positive polarity of 120 V dc is applied to the
D 1676 Test Method for Testing Film-Insulated Magnet
2 specimens. The surrounding sodium chloride solution is at
Wire
ground potential. The ground connection, using an immersed
D 1711 Terminology Relating to Electrical Insulation
electrode, is made using Nichrome, stainless steel, or other
3. Terminology
non-corrosive wire. Do not use iron, carbon steel, copper, or
brass (see Fig. 1).
3.1 Definitions: For definitions of terms used in this test
5.2 An appropriate container shall be selected for the
method refer to Terminology D 1711.
sodium chloride solution. Fit it with a cover to prevent
3.1.1 varnish, electrical insulating, n— a liquid resin sys-
evaporation of the solution.
tem that is applied to and cured on electrical components
providing electrical, mechanical, and environmental protec-
6. Safety Precautions
tion.
6.1 Do not use varnish at temperatures above the flash point
3.1.1.1 Discussion—There are two types of electrical insu-
when inadequate ventilation, and possibility of flames or
lating varnish— solvent–containing and solventless. The
sparks exist. Store varnish in sealed containers. These precau-
solvent-containing varnish is solution, dispersion, or emulsion
tions shall also apply to the handling of the reagents and
of a polymer or a mixture of polymers in a volatile, nonre-
solvents called for in this test method.
actable liquid. The solventless type is a liquid resin system free
6.2 Lethal voltages are a potential hazard during the
of volatile, nonreactable solvents.
performance of this test. It is essential that the test apparatus,
3.1.2 varnished, adj—referring to any item on to which
and all associated equipment electrically connected to it, be
varnish has been applied and cured.
properly designed and installed for safe operation. Solidly
4. Significance and Use ground all electrically conductive parts which it is possible for
a person to contact during the test. Provide means for use at
4.1 This test method is useful in determining the perfor-
the completion of any test to ground any parts which were at
mance of varnishes over enamelled magnet wire when sub-
high voltage during the test or have the potential for acquiring
an induced charge during the test or retaining a charge even
This test method is under the jurisdiction of ASTM Committee D-9 on
after disconnection of the voltage source. Thoroughly instruct
Electrical and Electronic Insulating Materials and is the direct responsibility of
all operators as to the correct procedures for performing tests
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
lating Compounds.
safely. When making high voltage tests, particularly in com-
Current edition approved Nov. 15, 1994. Published January 1995. Originally
pressed gas or in oil, it is possible for the energy released at
published as D 4880 – 88. Last previous edition D 4880 – 88.
2 breakdown to be suffıcient to result in fire, explosion, or rupture
Annual Book of ASTM Standards, Vol 10.01.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 4880
direction if a solvent-containing varnish was used. When
test
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