ASTM D5638-00

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation:D5638–00
Standard Test Method for
Chemical Resistance of Electrical Insulating Varnishes
This standard is issued under the fixed designation D 5638; 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 7. Safety Precautions
1.1 This test method covers the mechanical performance of 7.1 It is unsafe to use varnish at temperatures above the
insulating varnishes after exposure to various chemicals. flash point without adequate ventilation, especially if the
1.2 The values stated in SI units are the standard. possibility exists that flames or sparks are present. Store
1.3 This standard does not purport to address all of the varnish in sealed containers.
safety concerns, if any, associated with its use. It is the
8. Test Specimen
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 8.1 Prepare a minimum of five test specimens for each
chemical solution to be tested and five to determine uncondi-
bility of regulatory limitations prior to use. See 7.1.
tioned bond strength in accordance with Test Method D 2519
NOTE 1—There is no IEC/ISO equivalent.
using a wire mutually agreed upon by supplier and purchaser.
2. Referenced Documents
9. Procedure
2.1 ASTM Standards:
9.1 Condition a minimum of five test specimens in each
2519 TestMethodforBondStrengthofElectricalInsulating
chemical. Chemicals, test temperature and conditioning time
Varnishes by the Helical Coil Test
are mutually agreed upon by supplier and purchaser.
9.2 Test specimens both conditioned and unconditioned as
3. Terminology
described in Test Method D 2519 at standard laboratory
3.1 See Test Method D 2519.
conditions. Test conditioned within 15 min of removal from
container. Rinse conditioned specimens with water and pat dry
4. Summary of Test Method
when water soluble chemicals were used for conditioning.
4.1 Flexural strength tests are made on varnish-treated
Otherwise wipe specimens to remove excess chemical.
helical coils to determine the force required to break the coil
under specified conditions both before and after exposure to
NOTE 2—When using volatile chemicals, the time between removal
from the chemical and testing may affect test results.
liquid chemicals.
10. Report
5. Significance and Use
10.1 Report the following information:
5.1 This test method is useful for the evaluation of insulat-
10.1.1 Description of varnish,
ing varnish performance in chemical exposure.
10.1.2 Identification of wire used,
6. Apparatus
10.1.3 Cure time and temperature and number of dips used
6.1 Tensile
...