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    ASTM D1677 - 17

    Standard Methods for Sampling and Testing Untreated Mica Paper Used for Electrical Insulation

    Active Standard ASTM D1677 | Developed by Subcommittee: D09.01

    Book of Standards Volume: 10.01

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    Significance and Use

    7.1 Accurate determination of thickness is important for identification purposes. Thickness is related to weight and must be known in order to calculate apparent density and the dielectric strength.

    7.2 Thickness variation affects the quality of roll winding and is useful in judging the uniformity of mica paper particularly with respect to dielectric breakdown voltage, impregnation time, and thickness of the end product.

    1. Scope

    1.1 These methods cover procedures for sampling and testing untreated mica paper to be used as an electrical insulator or as a constituent of a composite material used for electrical insulating purposes.

    1.2 The procedures2 appear in the following order:










    Apparent Density



    Aqueous Extract Conductivity

    32 and 33





    Dielectric Strength

    16 – 19


    Impregnation Time

    20 – 24


    Moisture Content

    26 – 28


    Roll Quality






    Tensile Strength

    13 – 15



    6 – 10





    Weight Variability

    29 – 31


    1.3 The values stated in inch-pound 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    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

    D202 Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation

    D374 Test Methods for Thickness of Solid Electrical Insulation (Metric) D0374_D0374M

    D644 Test Method for Moisture Content of Paper and Paperboard by Oven Drying

    D646 Test Method for Mass Per Unit Area of Paper and Paperboard of Aramid Papers (Basis Weight)

    D685 Practice for Conditioning Paper and Paper Products for Testing

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

    D1711 Terminology Relating to Electrical Insulation

    ICS Code

    ICS Number Code 29.035.50 (Mica based insulating materials)

    UNSPSC Code

    UNSPSC Code 14110000(Paper products); 11101501(Mica)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D1677-17

    Citation Format

    ASTM D1677-17, Standard Methods for Sampling and Testing Untreated Mica Paper Used for Electrical Insulation, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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