ASTM D1676 - 17

    Standard Test Methods for Film-Insulated Magnet Wire

    Active Standard ASTM D1676 | Developed by Subcommittee: D09.12

    Book of Standards Volume: 10.01

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    Significance and Use

    7.1 Bond strength values obtained by flexural tests provide information with regard to the bond strength of a particular self-bonding outer coating in combination with a particular round film-insulated magnet wire when measured under conditions described in this test method.

    1. Scope

    1.1 These test methods cover procedures for testing film-insulated magnet wire that is used in electrical apparatus. These test methods are intended primarily for the evaluation of the electrical insulating materials used. The intent is that these test methods be used, except where modified, by individual specifications for particular applications.

    1.2 These test methods present different procedures for evaluating given properties of round, rectangular or square, copper or aluminum film-insulated magnet wire.

    1.3 The values stated in inch-pound units are the standard. The SI units in parentheses are provided for information only.

    1.4 The test methods appear in the following sections:



    Bond Strength

    4 – 12

    Burnout (AC Overload Resistance)

    13 – 21

    Chemical Resistance

    22 – 28

    Coefficient of Friction

    29 – 37

    Continuity, DC High Voltage

    38 – 45

    Continuity, DC Low Voltage

    46 – 53

    Completeness of Cure

    54 – 60

    Cut-Through Temperature (Thermoplastic Flow)

    61 – 68

    Dielectric Breakdown AC Voltage

    69 – 75

    Dielectric Breakdown AC Voltage after Bending

    76 – 82

    Dielectric Breakdown AC Voltage at Elevated Temperatures

    83 – 89

    Dielectric Breakdown AC Voltage after Conditioning in Refrigerant Atmosphere

    90 – 99

    Dimensional Measurement

    100 – 106

    Dissipation Factor Measurement

    107 – 114

    Electrical Resistance

    115 – 121


    122 – 129

    Extractables, Refrigerant

    130 – 140

    Film Adherence and Flexibility

    141 – 148



     a) Elastic Ratio


     b) Low Stress Elongation


     c) Spring Back


    Heat Shock

    156 – 162


    163 – 169

    Scrape Resistance, Unidirectional

    170 – 177


    178 – 185

    Resistance to Insulating Liquids and Hydrolytic Stability

    186 – 195

    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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in 9.5, 19.1, 19.3, 19.8, 52.1, 58, 59.1, 74.1, 112.1, 135.4, and 182.3.

    Note 1: This test method is related to IEC 60851. Since both methods contain multiple test procedures, many procedures are technically equivalent while others differ significantly.

    1.6 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

    A228/A228M Specification for Steel Wire, Music Spring Quality

    B3 Specification for Soft or Annealed Copper Wire

    B43 Specification for Seamless Red Brass Pipe, Standard Sizes

    B193 Test Method for Resistivity of Electrical Conductor Materials

    B279 Test Method for Stiffness of Bare Soft Square and Rectangular Copper and Aluminum Wire for Magnet Wire Fabrication

    B324 Specification for Aluminum Rectangular and Square Wire for Electrical Purposes

    B609/B609M Specification for Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical Purposes

    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

    D877 Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes

    D1533 Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration

    D1711 Terminology Relating to Electrical Insulation

    D2475 Specification for Felt

    D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test

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

    E4 Practices for Force Verification of Testing Machines

    E6 Terminology Relating to Methods of Mechanical Testing

    E8 Test Methods for Tension Testing of Metallic Materials

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques

    E1356 Test Method for Assignment of the Glass Transition Temperatures by Differential Scanning Calorimetry

    E1545 Test Method for Assignment of the Glass Transition Temperature by Thermomechanical Analysis

    Other Documents

    CCCM-911 Federal Specification for Bleached Muslin Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.

    ICS Code

    ICS Number Code 29.060.10 (Wires)

    UNSPSC Code

    UNSPSC Code 26121509(Magnet wire)

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

    DOI: 10.1520/D1676-17

    Citation Format

    ASTM D1676-17, Standard Test Methods for Film-Insulated Magnet Wire, ASTM International, West Conshohocken, PA, 2017,

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