Standard Withdrawn, No replacement   Last Updated: Mar 10, 2020 Track Document
ASTM D295-12

Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020)

Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020) D0295-12 ASTM|D0295-12|en-US Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020) Standard new BOS Vol. 10.01 Committee D09
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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.


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...
Dielectric Breakdown Voltage
43 to 46
Dielectric Breakdown Voltage Under Elongation47 to 53D149
Dissipation Factor and Permittivity54 to 60D150
Resistance to Oil
35 to 42
68 to 73
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 603942 in title only. The content is significantly different.


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 603942 Varnished Fabrics for Electrical Purposes Part 2: Methods of Test

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