ASTM D295 - 12

    Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation

    Active Standard ASTM D295 | Developed by Subcommittee: D09.07

    Book of Standards Volume: 10.01


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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. 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 Oil
    35 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 603942 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 603942 Varnished Fabrics for Electrical Purposes Part 2: Methods of Test


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    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

    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


    ICS Code

    ICS Number Code 29.035.99 (Other insulating materials)

    UNSPSC Code

    UNSPSC Code 11161700(Cotton fabrics)


    Referencing This Standard

    DOI: 10.1520/D0295-12

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D295-12, Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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