ASTM D352 - 97(2008)e1

    Standard Test Methods for Pasted Mica Used in Electrical Insulation

    Active Standard ASTM D352 | Developed by Subcommittee: D09.19

    Book of Standards Volume: 10.01


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    Significance and Use

    This test determines the compressive creep under laboratory conditions or under conditions that may be encountered during manufacture of electrical equipment. It has special significance if the material to be tested is applied as commutator segment insulation. It serves as a measure under specified conditions of the ability of the material to resist deformation while under compressive load, during exposure to elevated temperature for a specified time. This test is suitable for acceptance tests and for manufacturing control.

    1. Scope

    1.1 These test methods cover the testing of bonded mica splittings and bonded mica paper to be used for commutator insulation, hot molding, heater plates, and other similar insulating purposes.

    1.2 These test methods appear in the following sections:

    Test Sections
    Compressive Creep4-10
    Dielectric Strength38-41
    Mica or Binder Content19
    Molding Test31-36
    Organic Binder20-24
    Resistivity42-46
    Silicone Binder25-30
    Stability Under Heat and Pressure11-18

    1.3 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. See 40.1 and 45.1 for specific hazard statements.

    1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.


    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

    D257 Test Methods for DC Resistance or Conductance of Insulating Materials

    D1711 Terminology Relating to Electrical Insulation


    ICS Code

    ICS Number Code 29.035.50 (Mica based insulating materials)

    UNSPSC Code

    UNSPSC Code 11101501(Mica)


    Referencing This Standard

    DOI: 10.1520/D0352-97R08E01

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D352-97(2008)e1, Standard Test Methods for Pasted Mica Used in Electrical Insulation, ASTM International, West Conshohocken, PA, 2008, www.astm.org

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