ASTM D5637-00

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An American National Standard
Designation: D 5637 – 00
Standard Test Method for
Moisture Resistance of Electrical Insulating Varnishes
This standard is issued under the fixed designation D 5637; 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 6. Apparatus
1.1 This test method covers the mechanical performance of 6.1 Tensile Testing Machine—See Test Method D 2519.
electrical insulating varnishes subjected to high humidity 6.2 Test Fixture—See Test Method D 2519.
conditions. 6.3 Exposure Chamber—A chamber capable of maintaining
1.2 The values stated in SI units are to be regarded as a minimum of 100 % relative humidity with condensation, at
standard. 30 6 1°C.
1.3 This standard does not purport to address all of the
NOTE 1—The exposure chamber described in IEEE 117 has been found
safety concerns, if any, associated with its use. It is the
suitable.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 7. Safety Precautions
bility of regulatory limitations prior to use. See 7.1.
7.1 It is unsafe to use liquid varnish at temperatures above
the flash point without adequate ventilation, especially if the
2. Referenced Documents
possibility exists that flames or sparks are present.
2.1 ASTM Standards:
D 2519 Test Method for Bond Strength of Electrical Insu- 8. Test Specimens
lating Varnishes by the Helical Coil Test
8.1 Prepare a minimum of ten test specimens in accordance
2.2 IEEE Standard:
with Test Method D 2519 using a wire mutually agreed upon
IEEE 117 Standard Test Procedure for Evaluation of Sys-
by supplier and purchaser.
tems of Insulating Materials for Randon-Wound AC Elec-
9. Procedure
tric Machinery
9.1 Condition half of the test specimens in the exposure
3. Terminology
chamber maintaining a minimum of 98 % relative humidity for
3.1 See Test Method D 2519.
336 6 1h.
9.2 Test specimens both conditioned and unconditioned as
4. Summary of Test Method
described in Test Method D 2519 at standard laboratory
4.1 Flexural strength tests are made on varnish-treated
conditions. If possible, test conditioned specimens in the
helical coils to determine the force required to break the coil
exposure chamber. When specimens are not tested in the
under specified conditions both before and after exposure to
exposure chamber, they should be removed one at a time from
high humidity conditions.
the chamber and tested as soon as possible. The time after
removal from the chamber and room conditions may affect test
5. Significance and Use
results. Take care to minimize any change in humidity within
5.1 This test method is useful for the evaluation of insulat-
the cabinet during
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