ASTM D2756-07(2017)
(Test Method)Standard Test Method for Weight Loss of Electrical Insulating Varnishes
Standard Test Method for Weight Loss of Electrical Insulating Varnishes
SIGNIFICANCE AND USE
5.1 Weight loss is useful for indicating:
5.1.1 A form of degradation at elevated temperatures in air, and
5.1.2 Evolution of volatiles that have the potential to affect other components.
SCOPE
1.1 This test method covers the measurement of the loss in weight of cured electrical insulating varnishes on exposure to elevated temperature in air.
1.2 The values stated in SI units are the 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. For specific precaution statements, see Section 7.
Note 1: IEC 60216 Part 2 is technically equivalent to this standard.
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
Relations
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: D2756 − 07 (Reapproved 2017)
Standard Test Method for
Weight Loss of Electrical Insulating Varnishes
This standard is issued under the fixed designation D2756; 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* 2.2 IEC Standards:
IEC 60216 Guide for the determination of thermal endur-
1.1 This test method covers the measurement of the loss in
ance properties of electrical insulating materials—Part 2:
weight of cured electrical insulating varnishes on exposure to
Choice of test criteria
elevated temperature in air.
3. Terminology
1.2 The values stated in SI units are the standard.
3.1 Definitions: For definitions of terms used in this test
1.3 This standard does not purport to address all of the
method, refer to Terminology D1711.
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-
4.1 Specimens are prepared by coating glass cloth with
mine the applicability of regulatory limitations prior to use.
varnish to be tested. The specimens are aged at elevated
For specific precaution statements, see Section 7.
temperatures and the loss in weight is determined after a
NOTE 1—IEC 60216 Part 2 is technically equivalent to this standard.
specific time.
1.4 This international standard was developed in accor-
5. Significance and Use
dance with internationally recognized principles on standard-
5.1 Weight loss is useful for indicating:
ization established in the Decision on Principles for the
5.1.1 Aform of degradation at elevated temperatures in air,
Development of International Standards, Guides and Recom-
and
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 5.1.2 Evolution of volatiles that have the potential to affect
other components.
2. Referenced Documents
6. Apparatus
2.1 ASTM Standards:
6.1 Air-Circulating Oven, capable of meeting the require-
D115 Test Methods for Testing Solvent Containing Var-
ments of Specification D5423, Type II.
nishes Used for Electrical Insulation
6.2 Glass Cloth,heat-cleaned,StyleNo.116,asdescribedin
D1711 Terminology Relating to Electrical Insulation
Specification D2518.
D1932 Test Method for Thermal Endurance of Flexible
Electrical Insulating Varnishes
6.3 Balance, capable of weighing to nearest 0.001 g.
D2518 Specification for Woven Glass Fabrics for Electrical
6.4 Desiccator Jar, with a suitable desiccant.
Insulation (Withdrawn 2013)
D5423 Specification for Forced-Convection Laboratory Ov- 7. Safety Precautions
ens for Evaluation of Electrical Insulation
7.1 Do not use varnish at temperatures above the flash point
when inadequate ventilation and the possibility of flames or
sparksexist.Storeallvarnishes,reagentsandsolventsinsealed
This test method is under the jurisdiction of ASTM Committee D09 on containers. Apply these precautions to the handling of the
Electrical and Electronic Insulating Materials and is the direct responsibility of
called for reagents and solvents.
Subcommittee D09.01 on Electrical Insulating Products.
Current edition approved Nov. 1, 2017. Published November 2017. Originally
8. Sampling
approved in 1968. Last previous edition approved in 2012 as D2756 – 07 (2012).
DOI: 10.1520/D2756-07R17. 8.1 Sample the varnish in accordance with Test Methods
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
D115.
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. Available from International Electrotechnical Commission (IEC), 3 rue de
The last approved version of this historical standard is referenced on Varembé, Case postale 131, CH-1211, Geneva 20, Switzerland, http://www.iec.ch.
www.astm.org.
*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
D2756 − 07 (2017)
TABLE 1 Round-Robin Test Results
9. Test Specimens
Interlaboratory Standard
9.1 Prepare the test specimens as described in Test Method Hours at 200 °C Avg.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.