ASTM D5638-05(2010)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D5638 − 05(Reapproved 2010)
Standard Test Method for
Chemical Resistance of Electrical Insulating Varnishes
This standard is issued under the fixed designation D5638; 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 6. Apparatus
1.1 This test method covers the mechanical performance of 6.1 Tensile Testing Machine—See Test Method D2519.
insulating varnishes after exposure to various chemicals.
6.2 Test Fixture—See Test Method D2519.
1.2 The values stated in SI units are to be regarded as
6.3 Chemical Containers—Sealable 1000 mL containers of
standard. No other units of measurement are included in this
suitable material and design for containing the chemicals to be
standard.
used.
1.3 This standard does not purport to address all of the
7. Safety Precautions
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 7.1 It is unsafe to use varnish at temperatures above the
priate safety and health practices and determine the applica- flash point without adequate ventilation, especially if the
bility of regulatory limitations prior to use. See 7.1. possibility exists that flames or sparks are present. Store
varnish in sealed containers.
NOTE 1—There is no IEC/ISO equivalent.
8. Test Specimen
2. Referenced Documents
8.1 Prepare a minimum of five test specimens for each
2.1 ASTM Standards:
chemical solution to be tested and five to determine uncondi-
D2519 Test Method for Bond Strength of Electrical Insulat-
tioned bond strength in accordance with Test Method D2519
ing Varnishes by the Helical Coil Test
using a wire mutually agreed upon by supplier and user.
9. Procedure
3. Terminology
9.1 Condition a minimum of five test specimens in each
3.1 See Test Method D2519.
chemical. Chemicals, test temperature and conditioning time
are mutually agreed upon by supplier and user.
4. Summary of Test Method
9.2 Test specimens both conditioned and unconditioned as
4.1 Flexural strength tests are made on varnish-treated
described in Test Method D2519 at standard laboratory condi-
helical coils to determine the force required to break the coil
tions. Test conditioned specimens within 15 min of removal
under specified conditions both before and after exposure to
from container to minimize any change in bond strength after
liquid chemicals.
exposure. Rinse conditioned specimens with water and pat dry
when water soluble chemicals were used for conditioning.
5. Significance and Use
Otherwise wipe specimens to remove excess chemical.
5.1 This test method is useful for the evaluation of insulat-
10. Report
ing varnish performance in chemical exposure.
10.1 Report the following information:
10.1.1 Description of varnish,
1 10.1.2 Identification of wire used,
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical a
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