ASTM D5637-05

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation:D5637–05
Standard Test Method for
1
Moisture Resistance of Electrical Insulating Varnishes
This standard is issued under the fixed designation D5637; 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 5. Significance and Use
1.1 This test method covers the mechanical performance of 5.1 This test method is useful for the evaluation of insulat-
electrical insulating varnishes subjected to high humidity ing varnish performance in high humidity exposure.
conditions.
6. Apparatus
1.2 The values stated in SI units are to be regarded as
standard. 6.1 Tensile Testing Machine—See Test Method D2519.
6.2 Test Fixture—See Test Method D2519.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 6.3 Exposure Chamber—Achamber capable of maintaining
a minimum of 100 % relative humidity with condensation, at
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 30 6 1 °C.
bility of regulatory limitations prior to use. See 7.1.
NOTE 2—The exposure chamber described in IEEE 117 has been found
suitable.
NOTE 1—There is not ISO or IEC equivalent.
7. Safety Precautions
2. Referenced Documents
2
7.1 It is unsafe to use liquid varnish at temperatures above
2.1 ASTM Standards:
the flash point without adequate ventilation, especially if the
D2519 Test Method for Bond Strength of Electrical Insu-
possibility exists that flames or sparks are present. Store
lating Varnishes by the Helical Coil Test
varnish in sealed containers.
2.2 IEEE Standard:
IEEE 117 Standard Test Procedure for Evaluation of Sys-
8. Test Specimens
tems of Insulating Materials for Randon-WoundAC Elec-
3
8.1 Prepare a minimum of ten test specimens in accordance
tric Machinery
withTestMethodD2519usingawiremutuallyagreeduponby
3. Terminology
interested parties.
3.1 See Test Method D2519.
9. Procedure
4. Summary of Test Method
9.1 Condition half of the test specimens in the exposure
chamber maintaining a minimum of 98 % relative humidity for
4.1 Flexural strength tests are made on varnish-treated
336 61h.
helical coils to determine the force required to break the coil
9.2 Test specimens both conditioned and unconditioned as
under specified conditions both before and after exposure to
described in Test Method D2519 at standard laboratory condi-
high humidity conditions.
tions. If possible, test conditioned specimens in the exposure
chamber. When specimens are not tested in the exposure
1
This test method is under the jurisdiction of ASTM Committee D09 on
chamber, they should be removed one at a time from the
Electrical and Electronic Insulating Materials and is the direct responsibility of
chamber and tested as soon as possible.The time after removal
Subcommittee D09.0
...