ASTM D4882-17
(Test Method)Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Twisted-Coil Test
Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Twisted-Coil Test
SIGNIFICANCE AND USE
5.1 Values obtained by flexural test provides information with regard to the bond strength of the particular varnish in combination with a particular type of magnet wire, when measured under conditions described in this test method.
SCOPE
1.1 This test method covers the determination of the bond strength of an electrical insulating varnish when applied to a twisted coil of film-insulated magnet wire. The use of a particular type of film-insulated wire will show the values for that combination of film coating and varnish.
1.2 The values stated in inch-pound units are the standard. The values given in parentheses are for information only.
Note 1: Although this standard and Method C of IEC 61033 differ in approach or detail, data obtained using either are technically equivalent.
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. A specific precautionary statement is given in Section 7.
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
- Status
- Published
- Publication Date
- 31-Oct-2017
- Technical Committee
- D09 - Electrical and Electronic Insulating Materials
- Drafting Committee
- D09.01 - Electrical Insulating Products
Relations
- Effective Date
- 01-Nov-2017
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Nov-2019
- Effective Date
- 01-Mar-2019
- Effective Date
- 01-Nov-2018
- Effective Date
- 01-Nov-2017
- Effective Date
- 01-Nov-2015
- Effective Date
- 01-Nov-2014
- Effective Date
- 01-Nov-2014
- Effective Date
- 01-May-2014
- Effective Date
- 01-Nov-2013
- Effective Date
- 01-Apr-2012
- Effective Date
- 01-Apr-2012
- Effective Date
- 01-Aug-2011
Overview
ASTM D4882-17 is the internationally recognized standard test method for evaluating the bond strength of electrical insulating varnishes using the twisted-coil test. Developed by ASTM's Committee D09 on Electrical and Electronic Insulating Materials, this standard provides a reliable procedure for assessing how well an electrical insulating varnish bonds to a particular type of film-insulated magnet wire under specified conditions.
By following this method, manufacturers and users of electrical insulating materials can determine the compatibility and performance of varnish and magnet wire combinations, ensuring the effectiveness and durability of electrical insulation in various applications.
Key Topics
- Bond Strength Assessment: The standard details a flexural (bending) test, in which a twisted coil comprised of film-insulated magnet wire is coated with varnish and then subjected to mechanical stress to measure the force required to break the bonded assembly.
- Test Procedure:
- Preparation of a standardized twisted coil test specimen using specified wire diameter and coil dimensions.
- Application and curing of electrical insulating varnish under controlled conditions.
- Execution of the strength test using standardized apparatus to ensure repeatable and accurate results.
- Combination Testing: The method is especially valuable for evaluating specific varnish and magnet wire combinations, reflecting their performance when used together.
- Precision: Provides statistical values regarding mean bond strengths and standard deviations from interlaboratory testing, supporting the reliability and reproducibility of results.
- Safety and Precautions: Addresses key safety, health, and environmental practices to ensure safe handling and operation during varnish application and testing.
Applications
ASTM D4882-17 is critical in several areas across the electrical and electronics industries:
- Quality Assurance: Used by manufacturers of magnet wire and electrical insulating varnishes to verify product quality and consistency in production batches.
- Product Development and Selection: Assists engineers and designers in selecting the most compatible varnish and magnet wire combinations for motors, transformers, coils, and other electromagnetic devices.
- Supplier and Customer Agreements: Forms the basis for agreements between suppliers and customers regarding the expected performance of specific material pairings under standardized test conditions.
- Research and Benchmarking: Provides a benchmark for research and comparison with other insulating systems and technologies.
Key sectors that benefit from this test method include:
- Electrical equipment manufacturing
- Automotive and transportation industries
- Industrial automation and power distribution
- Research laboratories focused on insulating materials
Related Standards
To ensure comprehensive and up-to-date testing of electrical insulating materials, several related standards are referenced or closely associated with ASTM D4882-17:
- ASTM D115: Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
- ASTM D1711: Terminology Relating to Electrical Insulation
- ASTM D2519: Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
- IEC 61033: Test Methods for the Determination of Bond Strength of Impregnating Agents to an Enamelled Wire Substrate
These standards together enable a comprehensive approach to evaluating and ensuring the reliability of electrical insulation systems by addressing terminology, alternative test methods, and international equivalency.
Keywords: ASTM D4882, electrical insulating varnish, bond strength, twisted coil test, magnet wire, flexural test, insulation quality, electrical insulation testing, ASTM standards.
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Frequently Asked Questions
ASTM D4882-17 is a standard published by ASTM International. Its full title is "Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Twisted-Coil Test". This standard covers: SIGNIFICANCE AND USE 5.1 Values obtained by flexural test provides information with regard to the bond strength of the particular varnish in combination with a particular type of magnet wire, when measured under conditions described in this test method. SCOPE 1.1 This test method covers the determination of the bond strength of an electrical insulating varnish when applied to a twisted coil of film-insulated magnet wire. The use of a particular type of film-insulated wire will show the values for that combination of film coating and varnish. 1.2 The values stated in inch-pound units are the standard. The values given in parentheses are for information only. Note 1: Although this standard and Method C of IEC 61033 differ in approach or detail, data obtained using either are technically equivalent. 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. A specific precautionary statement is given in Section 7. 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.
SIGNIFICANCE AND USE 5.1 Values obtained by flexural test provides information with regard to the bond strength of the particular varnish in combination with a particular type of magnet wire, when measured under conditions described in this test method. SCOPE 1.1 This test method covers the determination of the bond strength of an electrical insulating varnish when applied to a twisted coil of film-insulated magnet wire. The use of a particular type of film-insulated wire will show the values for that combination of film coating and varnish. 1.2 The values stated in inch-pound units are the standard. The values given in parentheses are for information only. Note 1: Although this standard and Method C of IEC 61033 differ in approach or detail, data obtained using either are technically equivalent. 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. A specific precautionary statement is given in Section 7. 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.
ASTM D4882-17 is classified under the following ICS (International Classification for Standards) categories: 29.035.60 - Varnished fabrics. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D4882-17 has the following relationships with other standards: It is inter standard links to ASTM D4882-05(2012), ASTM D1711-24, ASTM D115-17(2024), ASTM D2519-19a, ASTM D2519-19, ASTM D2519-18, ASTM D115-17, ASTM D1711-15, ASTM D1711-14a, ASTM D115-14, ASTM D1711-14, ASTM D1711-13, ASTM D115-07(2012), ASTM D2519-07(2012), ASTM D1711-11a. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D4882-17 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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: D4882 − 17
Standard Test Method for
Bond Strength of Electrical Insulating Varnishes by the
Twisted-Coil Test
This standard is issued under the fixed designation D4882; 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* rials for Testing (Withdrawn 2012)
1.1 This test method covers the determination of the bond 2.2 IEC Standard:
strength of an electrical insulating varnish when applied to a IEC 61033 Test Methods for the Determination of Bond
twisted coil of film-insulated magnet wire. The use of a Strength of Impregnating Agents to an Enamelled Wire
particular type of film-insulated wire will show the values for Substrate
that combination of film coating and varnish.
3. Terminology
1.2 The values stated in inch-pound units are the standard.
The values given in parentheses are for information only. 3.1 Definitions of Terms Specific to This Standard:
3.1.1 bond strength, n—a measure of the force required to
NOTE 1—Although this standard and Method C of IEC 61033 differ in
separate surfaces which have been bonded together.
approach or detail, data obtained using either are technically equivalent.
3.2 Refer to Terminology D1711 for definitions of other
1.3 This standard does not purport to address all of the
terms.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use. A
4.1 Flexural strength tests are made on twisted coils to
specific precautionary statement is given in Section 7.
determine the force required to break the coils under specific
1.4 This international standard was developed in accor-
conditions.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Significance and Use
Development of International Standards, Guides and Recom-
5.1 Values obtained by flexural test provides information
mendations issued by the World Trade Organization Technical
with regard to the bond strength of the particular varnish in
Barriers to Trade (TBT) Committee.
combination with a particular type of magnet wire, when
measured under conditions described in this test method.
2. Referenced Documents
2.1 ASTM Standards:
6. Apparatus
D115 Test Methods for Testing Solvent Containing Var-
6.1 Coil winder as shown in Fig. 1 and Fig. 2.
nishes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation 6.2 Coil Twister as shown in Fig. 3.
D2519 Test Method for Bond Strength of Electrical Insulat-
6.3 Test apparatus as described in Test Method D2519.
ing Varnishes by the Helical Coil Test
D6054 Practice for Conditioning Electrical Insulating Mate-
7. Safety Precautions
7.1 It is unsafe to use varnish at temperatures above the
flash point without adequate ventilation, especially if the
This test method is under the jurisdiction of ASTM Committee D09 on
possibility exists that flames or sparks are present. Store
Electrical and Electronic Insulating Materials and is the direct responsibility of
varnish in sealed containers.
Subcommittee D09.01 on Electrical Insulating Products.
Current edition approved Nov. 1, 2017. Published November 2017. Originally
approved in 1988. Last previous edition approved in 2012 as D4882 – 05 (2012).
DOI: 10.1520/D4882-17.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.astm.org.
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute, 25 W. 43rd St., 4th
the ASTM website. Floor, New York, NY 10036.
*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
D4882 − 17
NOTE 2—Instead of 100 turns of a single wire, 50 turns of two parallel
wires are allowable to provide a bifilar winding.
8.1.1 After the coil has been wound, remove it from the
winding equipment and stretch into an oval shape as shown in
Fig. 4. Twist the coil two full turns around its longitudinal axis
by means of a twisting device as sh
...
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: D4882 − 05 (Reapproved 2012) D4882 − 17
Standard Test Method for
Bond Strength of Electrical Insulating Varnishes by the
Twisted-Coil Test
This standard is issued under the fixed designation D4882; 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 determination of the bond strength of an electrical insulating varnish when applied to a twisted
coil of film-insulated magnet wire. The use of a particular type of film-insulated wire will show the values for that combination
of film coating and varnish.
1.2 The values stated in inch-pound units are the standard. The values given in parentheses are for information only.
NOTE 1—Although this standard and Method C of IEC 61033 differ in approach or detail, data obtained using either are technically equivalent.
1.3 This standard does not purport to address all, if any, 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. A specific precautionary statement is given in Section 7.
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
2.1 ASTM Standards:
D115 Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
D6054 Practice for Conditioning Electrical Insulating Materials for Testing (Withdrawn 2012)
2.2 IEC Standard:
IEC 61033 Test Methods for the Determination of Bond Strength of Impregnating Agents to an Enamelled Wire Substrate
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bond strength, n—a measure of the force required to separate surfaces which have been bonded together.
3.2 Refer to Terminology D1711 for definitions of other terms.
4. Summary of Test Method
4.1 Flexural strength tests are made on twisted coils to determine the force required to break the coils under specific conditions.
5. Significance and Use
5.1 Values obtained by flexural test can provide provides information with regard to the bond strength of the particular varnish
in combination with a particular type of magnet wire, when measured under conditions described in this test method.
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 Jan. 1, 2012Nov. 1, 2017. Published January 2012November 2017. Originally approved in 1988. Last previous edition approved in 20052012
as D4882 – 05.D4882 – 05 (2012). DOI: 10.1520/D4882-05R12.10.1520/D4882-17.
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.
The last approved version of this historical standard is referenced on www.astm.org.
Available from American National Standards Institute, 25 W. 43rd St., 4th Floor, New York, NY 10036.
*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
D4882 − 17
6. Apparatus
6.1 Coil winder as shown in Fig. 1 and Fig. 2.
6.2 Coil Twister as shown in Fig. 3.
6.3 Test apparatus as described in Test Method D2519.
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 Preparation
8.1 The test specimen is a wound coil made from film-insulated magnet wire, 28 AWG (0.320 mm). The coil shall be made by
means of suitable winding equipment as shown in Fig. 1. To prevent opening of the coil after removal from the winding equipment,
each end of
...
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