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ASTM D3377-04(2013)

(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 and health 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.

General Information

Status
Historical
Publication Date
31-Mar-2013
ICS
29.035.60 - Varnished fabrics
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Drafting Committee
D09.01 - Electrical Insulating Products
Current Stage
Ref Project

Relations

Replaces
ASTM D3377-04(2009) - Standard Test Method for Weight Loss of Solventless Varnishes
Effective Date
01-Apr-2013
Replaced By
ASTM D3377-04(2018) - Standard Test Method for Weight Loss of Solventless Varnishes
Effective Date
01-Nov-2018

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ASTM D3377-04(2013) - Standard Test Method for Weight Loss of Solventless VarnishesASTM D3377-04(2013) - Standard Test Method for Weight Loss of Solventless Varnishes
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ASTM D3377-04(2013) - Standard Test Method for Weight Loss of Solventless Varnishes
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D3377 − 04 (Reapproved 2013)
Standard Test Method for
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 3. Terminology
1.1 This test method covers the determination of the percent 3.1 Definitions:
weight loss of cured solventless electrical varnishes when 3.1.1 varnish, n—electrical insulating, a liquid resin system
exposed to elevated temperatures for prescribed periods of that is applied to and cured on electrical components providing
time. electrical, mechanical, and environmental protection.
3.1.1.1 Discussion—There are two types of electrical insu-
1.2 Results of this test method are based on 6-mm ( ⁄4-in.)
lating varnish: solvent-containing and solventless.The solvent-
thick specimens and will not be applicable to specimens
containing varnish is a solution, dispersion, or emulsion of a
appreciably thinner or thicker than 6 mm.
polymer or mixture of polymers in a volatile, nonreactable
1.3 The values stated in SI units are to be regarded as the
liquid. The solventless type is a liquid resin system free of
standard.
volatile, nonreactable solvents.
1.4 This standard does not purport to address all of the
3.1.2 For definitions of other terms relating to electrical
safety concerns, if any, associated with its use. It is the
insulation, see Terminology D1711.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use.
4.1 The amount and composition of by-products produced
NOTE 1—This standard resembles IEC 60216–2 “Guide for the deter-
by exposure of insulating varnishes to elevated temperatures
mination of thermal endurance properties of electrical insulating materi-
can possibly:
als. Part 2: Choice of test criteria” in a number of ways, but is not
4.1.1 Deteriorate other insulations in the system,
consistently similar throughout. The data obtained using either standard
4.1.2 Cause cracking of insulation due to pressure, buildup
will possibly be technically equivalent.
in thick cross sections, or
4.1.3 Corrode other parts in the assembly.
2. Referenced Documents
4.2 Amount and rate of weight loss will possibly affect the
2.1 ASTM Standards:
thermal rating of a varnish.
D1711 Terminology Relating to Electrical Insulation
D5423 Specification for Forced-Convection Laboratory Ov-
5. Apparatus
ens for Evaluation of Electrical Insulation
5.1 Metal Mold, consisting of two flat sheets 300 by 300 by
2.2 IEC Standard:
1 1
6 mm (12 by 12 by ⁄4 in.) separated by 6.4 6 0.5-mm ( ⁄4 6
IEC 60216–2 Guide for the determination of thermal endur-
0.02-in.) thick spacers along three sides. The spacers also seal
ance properties of electrical insulating materials. Part 2:
3 the edges of the mold and the assembly is held together with
Choice of test criteria
“C” clamps or bolts. Aluminum or polished steel plates are
permissible.
5.2 Laboratory Balance, with accuracy of 6 1 mg.
This test method is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materialsand is direct responsibility of Subcom-
5.3 Forced-Convection Laboratory Oven, meeting require-
mittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulating
ments of Specification D5423, Type II for each test tempera-
Compounds.
ture.
Current edition approved April 1, 2013. Published April 2013. Originally
approved in 1975. Last previous edition approved in 2009 as D3377 – 04 (2009).
5.4 Screening Platform, 6-mm ( ⁄4-in.) mesh, with 50-mm
DOI: 10.1520/D3377-04R13.
(2-in.) legs.
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
5.5 Mold Release.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
NOTE 2—Fluorocarbon-type release agents are satisfactory.
Available from American National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036. 5.6 Desiccator.
Copyright ©ASTM Interna
...

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