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    ASTM D1039 - 16

    Standard Test Methods for Glass-Bonded Mica Used as Electrical Insulation

    Active Standard ASTM D1039 | Developed by Subcommittee: D09.01

    Book of Standards Volume: 10.01

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    Significance and Use

    6.1 This characteristic is useful for specification purposes and has utility as a quality control parameter.

    1. Scope

    1.1 These test methods cover the evaluation of the characteristics of glass-bonded, natural, or synthetic mica materials intended for use as electrical insulation.

    1.2 Glass bonded mica materials are commercially available in both injection molded and compression molded types. These test methods are applicable to both types except for tensile strength methods. (See Section 41.)

    1.3 The test methods appear in the following sections:

    Test Method


    ASTM Test Method

    Arc Resistance

    57 – 59


    Compressive Strength

    33 – 35





    Dielectric Strength

    48 – 51


    Dissipation Factor

    43 – 47

    D150 and D2149

    Heat Distortion Temperature

    24 – 29


    Impact Resistance

    36 – 39


    Modulus of Rupture

    30 – 32

    D790 and C674


    43 – 47

    D150 and D2149


    13 – 16


    Resistivity, Volume and Surface

    52 – 56


    Rockwell Hardness

    10 – 12


    Specific Gravity

    6 – 9





    Tensile Strength

    40 – 42

    D638 and D651




    Thermal Conductivity

    17 – 19

    C177 and E1225

    Thermal Expansion

    20 – 23

    E228 and E289


    49 and 54


    1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    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. See also Sections 45, 49, 54, and 58.

    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

    C177 Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus

    C674 Test Methods for Flexural Properties of Ceramic Whiteware Materials

    D116 Test Methods for Vitrified Ceramic Materials for Electrical Applications

    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

    D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics

    D257 Test Methods for DC Resistance or Conductance of Insulating Materials

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

    D495 Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation

    D618 Practice for Conditioning Plastics for Testing

    D638 Test Method for Tensile Properties of Plastics

    D648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position

    D651 Test Method for Test for Tensile Strength of Molded Electrical Insulating Materials

    D695 Test Method for Compressive Properties of Rigid Plastics

    D785 Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials

    D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials

    D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement

    D1711 Terminology Relating to Electrical Insulation

    D2149 Test Method for Permittivity (Dielectric Constant) And Dissipation Factor Of Solid Dielectrics At Frequencies To 10 MHz And Temperatures To 500C

    D6054 Practice for Conditioning Electrical Insulating Materials for Testing

    E228 Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer

    E289 Test Method for Linear Thermal Expansion of Rigid Solids with Interferometry

    E1225 Test Method for Thermal Conductivity of Solids Using the Guarded-Comparative-Longitudinal Heat Flow Technique

    ICS Code

    ICS Number Code 29.035.50 (Mica based insulating materials)

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

    DOI: 10.1520/D1039-16

    Citation Format

    ASTM D1039-16, Standard Test Methods for Glass-Bonded Mica Used as Electrical Insulation, ASTM International, West Conshohocken, PA, 2016, www.astm.org

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