ASTM D295-12
(Test Method)Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020)
Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020)
SIGNIFICANCE AND USE
The thickness test is necessary to determine whether the material meets specified tolerances for thickness. In addition, thickness values are essential because of the importance of space factor in designing electrical equipment.
SCOPE
1.1 These test methods cover procedures for the testing of varnished cotton fabrics and varnished cotton fabric tapes (Note 1) to be used as electrical insulation and are directly applicable to both “straight-cut” and “bias-cut” materials, unless otherwise stated in the test method.
Note 1—Methods of testing varnished glass fabrics and tapes are given in Test Methods D902.
1.2 The procedures appear in the following order:
ProceduresSectionsASTM Test Methods Breaking Strength20 to 27... Conditioning
Dielectric Breakdown Voltage 5
43 to 46...
D149 Dielectric Breakdown Voltage Under Elongation47 to 53D149 Dissipation Factor and Permittivity54 to 60D150 Elongation
Resistance to Oil35 to 42
68 to 73...
D92 Selection of Test Specimens 4... Tear Resistance28 to 34D689 Thickness 6 to 10D374 Thread Count15 to 19... Volume Resistance61 to 67D257 Weight11 to 14...
1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.
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. For specific precautionary statements, see 44.4, 51.1, 58.1, and 65.1.
Note 2—This standard resembles IEC 60394–2 in title only. The content is significantly different. ^REFERENCE:
ASTM Standards:
D92 Test Method for Flash and Fire Points by Cleveland Open Cup Tester
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D257 Test Methods for DC Resistance or Conductance of Insulating Materials
D374 Test Methods for Thickness of Solid Electrical Insulation
D689 Test Method for Internal Tearing Resistance of Paper (Withdrawn)
D902 Test Methods for Flexible Resin-Coated Glass Fabrics and Glass Fabric Tapes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
IEC Standard:
IEC 60394–2 Varnished Fabrics for Electrical Purposes Part 2: Methods of Test
WITHDRAWN RATIONALE
These test methods cover procedures for the testing of varnished cotton fabrics and varnished cotton fabric tapes to be used as electrical insulation and are directly applicable to both “straight-cut” and “bias-cut” materials, unless otherwise stated in the test method.
Formerly under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials, these test methods were withdrawn in March 2020. This standard is being withdrawn without replacement because it is no longer being maintained..
General Information
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Standards Content (Sample)
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: D295 − 12
Standard Test Methods for
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Varnished Cotton Fabrics Used for Electrical Insulation
This standard is issued under the fixed designation D295; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 These test methods cover procedures for the testing of
D92 Test Method for Flash and Fire Points by Cleveland
varnished cotton fabrics and varnished cotton fabric tapes
Open Cup Tester
(Note 1) to be used as electrical insulation and are directly
D149 Test Method for Dielectric Breakdown Voltage and
applicable to both “straight-cut” and “bias-cut” materials,
Dielectric Strength of Solid Electrical Insulating Materials
unless otherwise stated in the test method.
at Commercial Power Frequencies
D150 Test Methods forAC Loss Characteristics and Permit-
NOTE 1—Methods of testing varnished glass fabrics and tapes are given
in Test Methods D902.
tivity (Dielectric Constant) of Solid Electrical Insulation
D257 Test Methods for DC Resistance or Conductance of
1.2 The procedures appear in the following order:
Insulating Materials
ASTM Test
D374 Test Methods for Thickness of Solid Electrical Insu-
Procedures Sections Methods
lation (Metric) D0374_D0374M
Breaking Strength 20 to 27 .
Conditioning 5 .
D689 Test Method for Internal Tearing Resistance of Paper
Dielectric Breakdown Voltage 43 to 46 D149 3
(Withdrawn 2009)
Dielectric Breakdown Voltage Under Elongation 47 to 53 D149
D902 Test Methods for Flexible Resin-Coated Glass Fabrics
Dissipation Factor and Permittivity 54 to 60 D150
Elongation 35 to 42 .
and Glass Fabric Tapes Used for Electrical Insulation
Resistance to Oil 68 to 73 D92
D1711 Terminology Relating to Electrical Insulation
Selection of Test Specimens 4 .
Tear Resistance 28 to 34 D689
2.2 IEC Standard:
Thickness 6 to 10 D374
IEC 60394–2 Varnished Fabrics for Electrical Purposes —
Thread Count 15 to 19 .
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Part 2: Methods of Test
Volume Resistance 61 to 67 D257
Weight 11 to 14 .
3. Terminology
1.3 The values stated in inch-pound units are to be regarded
as the standard. The metric equivalents of inch-pound units 3.1 Definitions—For definitions of terms used in these test
methods refer to Terminology D1711.
may be approximate.
3.2 Definitions of Terms Specific to This Standard:
1.4 This standard does not purport to address all of the
3.2.1 weight—of varnished cloth and varnished cloth tapes,
safety concerns, if any, associated with its use. It is the
the weight per unit area as determined in accordance with this
responsibility of the user of this standard to establish appro-
test method. It is usually expressed in pound per square yard
priate safety and health practices and determine the applica-
for a specified nominal thickness.
bility of regulatory limitations prior to use. For specific
3.2.2 threads per inch—of varnished cloths, the count of the
precautionary statements, see 44.4, 51.1, 58.1, and 65.1.
number of warp and filling yarns present in the base cloth per
NOTE 2—This standard resembles IEC 60394–2 in title only. The
linear inch of width or length, respectively.
content is significantly different.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
These test methods are under the jurisdiction of ASTM Committee D09 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Electrical and Electronic Insulating Materials and are the direct responsibility of Standards volume information, refer to the standard’s Document Summary page on
Subcommittee D09.07 on Electrical Insulating Materials. the ASTM website.
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Current edition approved Jan. 15, 2012. Published February 2012. Originally The last approved version of this historical standard is referenced on
approved in 1928. Last previous edition approved in 2004 as D295 – 99 (2004) www.astm.org.
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which was withdrawn in October 2009 and reinstated in January 2012. DOI: Available from American National Standards Institute, 11 W 42nd St.,New
10.1520/D0295-12. York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D295 − 12
3.2.3 elongation—the amount of strain observed in a given TEST METHOD A: THICKNESS
length of varnished cloth or tape when subjected to prescribed
6. Significance and Use
loading conditions at prescribed atmospheric conditions. It is
expressed as a percentage of the initial length. 6.1 The thic
...
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