ASTM D5638-14
(Test Method)Standard Test Method for Chemical Resistance of Electrical Insulating Varnishes
Standard Test Method for Chemical Resistance of Electrical Insulating Varnishes
SIGNIFICANCE AND USE
5.1 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 to be regarded as standard. No other units of measurement are included in this standard.
1.3 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 7.1.
Note 1: There is no IEC/ISO equivalent.
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Designation: D5638 − 14
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. 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
2 8.1 Prepare a minimum of five test specimens for each
2.1 ASTM Standards:
chemical solution to be tested and a minimum of five to
D2519 Test Method for Bond Strength of Electrical Insulat-
determineunconditionedbondstrengthinaccordancewithTest
ing Varnishes by the Helical Coil Test
Method D2519 using a wire mutually agreed upon by supplier
and user.
3. Terminology
3.1 See Test Method D2519.
9. Procedure
9.1 Condition a minimum of five test specimens in each
4. Summary of Test Method
chemical. Chemicals, test temperature, and conditioning time
4.1 Flexural strength tests are made on varnish-treated
are mutually agreed upon by supplier and user.
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-
liquid chemicals.
tions. Test conditioned specimens within 15 min of removal
from container to minimize any change in bond strength after
5. Significance and Use
exposure. Rinse conditioned specimens with water and pat dry
5.1 This test method is useful for the evaluation of insulat- when water soluble chemicals were used for conditioning.
Otherwise wipe specimens to remove excess chemical.
ing varnish performance in chemical exposure.
10. Report
1 10.1 Report the following information:
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
10.1.1 Description of varnish,
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
10.1.2 Identification of wire used,
in
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5638 − 05 (Reapproved 2010) D5638 − 14
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 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 to be regarded as standard. No other units of measurement are included in this standard.
1.3 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 7.1.
NOTE 1—There is no IEC/ISO equivalent.
2. Referenced Documents
2
2.1 ASTM Standards:
D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
3. Terminology
3.1 See Test Method D2519.
4. Summary of Test Method
4.1 Flexural strength tests are made on varnish-treated helical coils to determine the force required to break the coil under
specified conditions both before and after exposure to liquid chemicals.
5. Significance and Use
5.1 This test method is useful for the evaluation of insulating varnish performance in chemical exposure.
6. Apparatus
6.1 Tensile Testing Machine—See Test Method D2519.
6.2 Test Fixture—See Test Method D2519.
6.3 Chemical Containers—Sealable 1000 mL 1000-mL containers of suitable material and design for containing the chemicals
to be used.
7. Safety Precautions
7.1 It is unsafe to use varnish at temperatures above the flash point without adequate ventilation, especially if the possibility
exists that flames or sparks are present. Store varnish in sealed containers.
8. Test Specimen
8.1 Prepare a minimum of five test specimens for each chemical solution to be tested and a minimum of five to determine
unconditioned bond strength in accordance with Test Method D2519 using a wire mutually agreed upon by supplier and user.
1
This test method is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.01 on Electrical Insulating Varnishes, Powders and Encapsulating Compounds.
Current edition approved May 1, 2010Nov. 1, 2014. Published September 2010November 2014. Originally approved in 1994. Last previous edition approved in 2005 2010
as D5638D5638 – 05 (2010).–05. DOI: 10.1520/D5638-05R10. 10.1520/D5638-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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