ASTM D3377-04(2018)
(Test Method)Standard Test Method for Weight Loss of Solventless Varnishes
Standard Test Method for Weight Loss of Solventless Varnishes
SIGNIFICANCE AND USE
4.1 The amount and composition of by-products produced by exposure of insulating varnishes to elevated temperatures can possibly:
4.1.1 Deteriorate other insulations in the system,
4.1.2 Cause cracking of insulation due to pressure, buildup in thick cross sections, or
4.1.3 Corrode other parts in the assembly.
4.2 Amount and rate of weight loss will possibly affect the thermal rating of a varnish.
SCOPE
1.1 This test method covers the determination of the percent weight loss of cured solventless electrical varnishes when exposed to elevated temperatures for prescribed periods of time.
1.2 Results of this test method are based on 6-mm (1/4-in.) thick specimens and will not be applicable to specimens appreciably thinner or thicker than 6 mm.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 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.
Note 1: This standard resembles IEC 60216–2 “Guide for the determination of thermal endurance properties of electrical insulating materials. Part 2: Choice of test criteria” in a number of ways, but is not consistently similar throughout. The data obtained using either standard will possibly be technically equivalent.
1.5 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: D3377 − 04 (Reapproved 2018)
Standard Test Method for
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Weight Loss of Solventless Varnishes
This standard is issued under the fixed designation D3377; 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 Standard:
IEC 60216–2 Guide for the determination of thermal endur-
1.1 This test method covers the determination of the percent
ance properties of electrical insulating materials. Part 2:
weight loss of cured solventless electrical varnishes when
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Choice of test criteria
exposed to elevated temperatures for prescribed periods of
time.
3. Terminology
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1.2 Results of this test method are based on 6-mm ( ⁄4-in.)
3.1 Definitions:
thick specimens and will not be applicable to specimens
3.1.1 varnish, n—electrical insulating, a liquid resin system
appreciably thinner or thicker than 6 mm.
that is applied to and cured on electrical components providing
1.3 The values stated in SI units are to be regarded as the
electrical, mechanical, and environmental protection.
standard.
3.1.1.1 Discussion—There are two types of electrical insu-
lating varnish: solvent-containing and solventless.The solvent-
1.4 This standard does not purport to address all of the
containing varnish is a solution, dispersion, or emulsion of a
safety concerns, if any, associated with its use. It is the
polymer or mixture of polymers in a volatile, nonreactable
responsibility of the user of this standard to establish appro-
liquid. The solventless type is a liquid resin system free of
priate safety, health, and environmental practices and deter-
volatile, nonreactable solvents.
mine the applicability of regulatory limitations prior to use.
3.1.2 For definitions of other terms relating to electrical
NOTE 1—This standard resembles IEC 60216–2 “Guide for the deter-
insulation, see Terminology D1711.
mination of thermal endurance properties of electrical insulating materi-
als. Part 2: Choice of test criteria” in a number of ways, but is not
consistently similar throughout. The data obtained using either standard
4. Significance and Use
will possibly be technically equivalent.
4.1 The amount and composition of by-products produced
1.5 This international standard was developed in accor-
by exposure of insulating varnishes to elevated temperatures
dance with internationally recognized principles on standard-
can possibly:
ization established in the Decision on Principles for the
4.1.1 Deteriorate other insulations in the system,
Development of International Standards, Guides and Recom-
4.1.2 Cause cracking of insulation due to pressure, buildup
mendations issued by the World Trade Organization Technical
in thick cross sections, or
Barriers to Trade (TBT) Committee.
4.1.3 Corrode other parts in the assembly.
4.2 Amount and rate of weight loss will possibly affect the
2. Referenced Documents
thermal rating of a varnish.
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2.1 ASTM Standards:
D1711 Terminology Relating to Electrical Insulation
5. Apparatus
D5423 Specification for Forced-Convection Laboratory Ov-
ens for Evaluation of Electrical Insulation 5.1 Metal Mold, consisting of two flat sheets 300 by 300 by
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6 mm (12 by 12 by ⁄4 in.) separated by 6.4 6 0.5-mm ( ⁄4 6
0.02-in.) thick spacers along three sides. The spacers also seal
the edges of the mold and the assembly is held together with
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This test method is under the jurisdiction of ASTM Committee D09 on
“C” clamps or bolts. Aluminum or polished steel plates are
Electrical and Electronic Insulating Materialsand is direct responsibility of Subcom-
mittee D09.01 on Electrical Insulating Products. permissible.
Current edition approved Nov. 1, 2018. Published November 2018. Originally
5.2 Laboratory Balance, with accuracy of 6 1 mg.
approved in 1975. Last previous edition approved in 2013 as D3377 – 04 (2013).
DOI: 10.1520/D3377-04R18.
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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
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Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute, 11 W. 42nd St., 13th
the ASTM website. Floor, New York, NY 10036.
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D3377 − 04 (2018)
5.3 Forced-Convection Laboratory Oven, meeting require-
Anticipated End
Use Temperature, °C T
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