ASTM D902 - 12

    Standard Test Methods for Flexible Resin-Coated Glass Fabrics and Glass Fabric Tapes Used for Electrical Insulation

    Active Standard ASTM D902 | Developed by Subcommittee: D09.07

    Book of Standards Volume: 10.01


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    Significance and Use

    The electrical properties of resin-coated glass fabrics are affected by their temperature and moisture content. For this reason it is necessary to control these properties for a specified time immediately prior to testing in order to attain reasonably good reproducibility of test values. The time of exposure to the conditioning atmosphere must be long enough to permit the test specimen to reach a relatively stable value. Usually the moisture content of these materials has little effect on the mechanical properties.

    1. Scope

    1.1 These test methods cover procedures for the testing of resin-coated glass fabrics and glass fabric tapes (Note 1) to be used as electrical insulation.

    Note 1—Methods of testing varnished cloths and tapes are given in Methods D295.

    1.2 The warp threads in fabrics are the threads that are parallel with the length dimension as manufactured.

    1.3 The procedures appear as follows:


    Procedure

    Section
    ASTM Test
    Method Reference
    Breaking Strength22-28D828
    Conditioning 6-8...
    Dielectric Breakdown Voltage and Di-
    electric Strength
    29-38D149, D295
    Dissipation Factor and Relative Permit-
    tivity
    52-60D150, E104, D5032
    Effect of Elevated Temperature39-45D1830
    Resistance to Oil46-51D3487
    Sampling 3-5...
    Thermal Endurance68 D1830
    Thickness16-21D374
    Thread Count12-15...
    Weight 9-11...
    Weight Loss at Elevated Temperature61-67 D5423

    1.4 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.

    1.5 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. Specific warning statement are given in 35.1.1 and 58.1.


    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

    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

    D295 Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation

    D374 Test Methods for Thickness of Solid Electrical Insulation

    D828 Test Method for Tensile Properties of Paper and Paperboard Using Constant-Rate-of-Elongation Apparatus

    D1711 Terminology Relating to Electrical Insulation

    D1830 Test Method for Thermal Endurance of Flexible Sheet Materials Used for Electrical Insulation by the Curved Electrode Method

    D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus

    D5032 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Glycerin Solutions

    D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

    E104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions

    IEEE Standard

    IEEENo.1 General Principles for Temperature Limits in the Rating of Electrical Equipment Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http://www.ieee.org.


    ICS Code

    ICS Number Code 29.035.30 (Glass and ceramic insulating materials)

    UNSPSC Code

    UNSPSC Code 31201502(Electrical insulating tape)


    Referencing This Standard

    DOI: 10.1520/D0902-12

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D902-12, Standard Test Methods for Flexible Resin-Coated Glass Fabrics and Glass Fabric Tapes Used for Electrical Insulation, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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