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    ASTM D229 - 19e1

    Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation

    Active Standard ASTM D229 | Developed by Subcommittee: D09.07

    Book of Standards Volume: 10.01

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    Significance and Use

    18.1 This test method provides useful engineering information for evaluating the mechanical behavior of rigid electrical insulation at elevated temperature. When the proper exposure and test temperatures are chosen, depending on the material and end-use operating temperature, use the test method as one means of indicating relative thermal degradation of rigid insulating materials.

    1. Scope

    1.1 These test methods cover procedures for testing rigid electrical insulation normally manufactured in flat sheet or plate form. They are generally used as terminal boards, spacers, voltage barriers, and circuit boards.

    1.2 Use Test Methods D619 (withdrawn) or Specification D710 for tests applying to vulcanized fibre.

    1.3 Some of the test methods contained in this standard are similar to those contained in IEC 60893-2, which applies to rigid industrial laminated sheets based on thermosetting resins for electrical purposes.

    1.4 The test methods appear in the following sections:




    Acetone extractable matter

    82 to 83


    Arc resistance




    56 to 60


    Bonding strength

    49 to 54


    Flammability methods I and II

    61 to 74


    Coefficient of linear thermal expansion



    Compressive strength






    Dissipation factor

    34 to 40


    Dielectric strength

    28 to 33


    Expansion (linear thermal)



    Flexural properties

    12 to 24


    Hardness (Rockwell)



    Insulation resistance and resistivity

    41 to 46



    34 to 40


    Resistance to impact



    Tensile properties

    7 to 11



    5 to 6


    Tracking resistance



    Warp or twist

    76 to 81


    Water absorption



    1.5 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.

    1.6 This is a fire-test-response standard. See Sections 61 through 74, which are the procedures for assessing ignitability and burning time under specific test conditions

    1.7 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. Specific precautionary statements are given in 31.1 and 1.8.

    1.8 This standard measures and describes the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.

    1.9 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.

    1.10 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

    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

    D494 Test Method for Acetone Extraction of Phenolic Molded or Laminated Products

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

    D570 Test Method for Water Absorption of Plastics

    D617 Test Method for Punching Quality of Phenolic Laminated Sheets

    D619 Test Methods for Vulcanized Fibre Used for Electrical Insulation

    D638 Test Method for Tensile Properties of Plastics

    D669 Test Method for Dissipation Factor and Permittivity Parallel with Laminations of Laminated Sheet and Plate Materials

    D695 Test Method for Compressive Properties of Rigid Plastics

    D696 Test Method for Coefficient of Linear Thermal Expansion of Plastics Between 30C and 30C with a Vitreous Silica Dilatometer

    D710 Specification for Vulcanized Fibre Sheets, Rods, and Tubes Used for Electrical Insulation

    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

    D883 Terminology Relating to Plastics

    D1674 Test Method for Testing Polymerizable Embedding Compounds Used for Electrical Insulation

    D1711 Terminology Relating to Electrical Insulation

    D1825 Practice for Etching and Cleaning Copper-Clad Electrical Insulating Materials and Thermosetting Laminates for Electrical Testing

    D2132 Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Materials

    D2303 Test Methods for Liquid-Contaminant, Inclined-Plane Tracking and Erosion of Insulating Materials

    D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus

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

    D6054 Practice for Conditioning Electrical Insulating Materials for Testing

    E176 Terminology of Fire Standards

    E197 Specification for Enclosures and Servicing Units for Tests Above and Below Room Temperature

    IEC Standard

    IEC 60893–2 Specification for Rigid Industrial Laminated Sheets Based on Thermosetting Resins for Electrical Purpose, Methods of Tests Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

    ICS Code

    ICS Number Code 29.035.01 (Insulating materials in general)

    UNSPSC Code

    UNSPSC Code 30265800(Plastic bars and sheets)

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

    DOI: 10.1520/D0229-19E01

    Citation Format

    ASTM D229-19e1, Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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