ASTM D5638-18
(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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See 7.1.
Note 1: There is no IEC/ISO equivalent.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5638 − 18
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* 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-
insulating varnishes after exposure to various chemicals. ing varnish performance in chemical exposure.
1.2 The values stated in SI units are to be regarded as
6. Apparatus
standard. No other units of measurement are included in this
standard.
6.1 Tensile Testing Machine—See Test Method D2519.
1.3 This standard does not purport to address all of the
6.2 Test Fixture—See Test Method D2519.
safety concerns, if any, associated with its use. It is the
6.3 Chemical Containers—Sealable 1000-mL containers of
responsibility of the user of this standard to establish appro-
suitable material and design for containing the chemicals to be
priate safety, health, and environmental practices and deter-
used.
mine the applicability of regulatory limitations prior to use.
See 7.1.
7. Safety Precautions
NOTE 1—There is no IEC/ISO equivalent.
7.1 It is unsafe to use varnish at temperatures above the
1.4 This international standard was developed in accor-
flash point without adequate ventilation, especially if the
dance with internationally recognized principles on standard-
possibility exists that flames or sparks are present. Store
ization established in the Decision on Principles for the
varnish in sealed containers.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
8. Test Specimen
Barriers to Trade (TBT) Committee.
8.1 Prepare a minimum of five test specimens for each
chemical solution to be tested and a minimum of five to
2. Referenced Documents
determineunconditionedbondstrengthinaccordancewithTest
2
2.1 ASTM Standards:
Method D2519 using a wire mutually agreed upon by supplier
D2519 Test Method for Bond Strength of Electrical Insulat-
and user.
ing 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
4. Summary of Test Method
are mutually agreed upon by supplier and user.
4.1 Flexural strength tests are made on varnish-treated
9.2 Test specimens both conditioned and unconditioned as
helical coils to determine the force required to break the coil
described in Test Method D2519 at 23 6 2°C and less than
under specified conditions both before and after exposure to
55 % RH. Test conditioned specimens within 15 min of
liquid chemicals.
removal from container to minimize any change in bond
strength after exposure. Rinse conditioned specimens with
water and pat dry when water soluble chemicals were used for
1
This test method is under the jurisdiction of ASTM Committee D09 on
conditioning. Otherwise wipe specimens to remove excess
Electric
...
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 − 14 D5638 − 18
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*
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. See 7.1.
NOTE 1—There is no IEC/ISO equivalent.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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 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.
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 CompoundsProducts.
Current edition approved Nov. 1, 2014Nov. 1, 2018. Published November 2014November 2018. Originally approved in 1994. Last previous edition approved in 20102014
as D5638 – 05 (2010).D5638 – 14. DOI: 10.1520/D5638-14.10.1520/D5638-18.
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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5638 − 18
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.
9. Procedure
9.1 Condition a minimum of five test specimens in each chemical. Chemicals, test temperature, and conditioning time are
mutually agreed upon by supplier and user.
9.2 Test specimens both conditioned and unconditioned as described in Test Method D2519 at standard laboratory conditions.
23 6 2°C and less than 55 % RH. Test conditioned specimens within 15 min of removal from container to minimize any change
in bond strength after exposure. Rinse conditioned specimens with water and pat dry when water soluble chemicals were used for
conditioning. Otherwise wipe specimens to remove excess chemical.
10. Report
10.1 Report the following information:
10.1.1 Description of varnish,
10.1.2 Identification of wire used,
10.1.3 Cure time and temperature and number of dips used to prepare the coils,
10.1.4 Average bond strength in newtons (pounds-force) of unconditioned coils,
10.1.5 Average bo
...
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