ASTM D5638-05

Standard Test Method for Chemical Resistance of Electrical Insulating Varnishes

SIGNIFICANCE AND USE
This test method is useful for the evaluation of insulating varnish performance in chemical exposure.
SCOPE
1.1 This test method covers the mechanical performance of insulating varnishes after exposure to various chemicals.
1.2 The values stated in SI units are the standard.
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. See .Note 1
There is no IEC/ISO equivalent.

General Information

• Status: Historical
• Publication Date: 31-Aug-2005
• ICS: 29.035.60 - Varnished fabrics
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.01 - Electrical Insulating Products

Relations

• Replaces: ASTM D5638-00 - Standard Test Method for Chemical Resistance of Electrical Insulating Varnishes
• Effective Date: 01-Sep-2005
• Replaced By: ASTM D5638-05(2010) - Standard Test Method for Chemical Resistance of Electrical Insulating Varnishes
• Effective Date: 01-May-2010
• Referred By: ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
• Effective Date: 01-Sep-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D5638–05
Standard Test Method for
1
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 6.3 Chemical Containers—Sealable 1000 mL containers of
suitable material and design for containing the chemicals to be
1.1 This test method covers the mechanical performance of
used.
insulating varnishes after exposure to various chemicals.
1.2 The values stated in SI units are the standard.
7. Safety Precautions
1.3 This standard does not purport to address all of the
7.1 It is unsafe to use varnish at temperatures above the
safety concerns, if any, associated with its use. It is the
flash point without adequate ventilation, especially if the
responsibility of the user of this standard to establish appro-
possibility exists that flames or sparks are present. Store
priate safety and health practices and determine the applica-
varnish in sealed containers.
bility of regulatory limitations prior to use. See 7.1.
NOTE 1—There is no IEC/ISO equivalent. 8. Test Specimen
8.1 Prepare a minimum of five test specimens for each
2. Referenced Documents
chemical solution to be tested and five to determine uncondi-
2
2.1 ASTM Standards:
tioned bond strength in accordance with Test Method D2519
D2519 Test Method for Bond Strength of Electrical Insu-
using a wire mutually agreed upon by supplier and user.
lating Varnishes by the Helical Coil Test
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-
ing varnish performance in chemical exposure.
10. Report
10.1 Report the following information:
6. Apparatus
10.1.1 Description of varnish,
6.1 Tensile Testing Machine—See Test Method D2519.
10.1.2 Identification of wire used,
6.2 Test Fixture—See Test Method D2519.
10.1.3 Cure time an
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