ASTM D2671 - 21

    Standard Test Methods for Heat-Shrinkable Tubing for Electrical Use

    Active Standard ASTM D2671 | Developed by Subcommittee: D09.07

    Book of Standards Volume: 10.02

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    Significance and Use

    4.1 These test methods include most of the important tests used to characterize heat-shrinkable tubing. They are intended primarily for, but not limited to, extruded heat-shrinkable tubing.

    4.2 It is acceptable to use variations in these test methods or alternate contemporary methods of measurement to determine the values for the properties in this standard provided such methods ensure quality levels and measurement accuracy equal to or better than those prescribed herein. It is the responsibility of the organizations using alternate test methods to be able to demonstrate this condition. In cases of dispute, the methods specified herein shall be used.

    Note 2: Provision for alternate methods is necessary because of (1) the desire to simplify procedures for specific applications without altering the result, and (2) the desire to eliminate redundant testing and use data generated during manufacturing process control, including that generated under Statistical Process Control (SPC) conditions, using equipment and methods other than those specified herein. An example would be the use of laser micrometers or optical comparators to measure dimensions.

    1. Scope

    1.1 These test methods cover the testing of heat-shrinkable tubing used for electrical insulation. Materials used include poly(vinyl chloride), polyolefins, fluorocarbon polymers, silicone rubber, and other plastic or elastomeric compounds.

    1.2 These test methods appear in the following sections:




    Adhesive Peel Strength

    94 – 100


    Brittleness Temperature




    55 and 56


    Color Stability

    57 – 62





    Copper Stability



    Corrosion Testing

    85 – 91


    Dielectric Breakdown

    20 – 25



    8 – 13




    (Methods A, C, or D)

    Fluid Resistance

    63 – 67


    Fungus Resistance

    100 – 104


    Heat Resistance

    49 – 54


    Heat Shock

    26 – 30


    Low-temperature Properties

    36 – 43


    Restricted Shrinkage

    14 – 19


    Selection of Test Specimens



    Secant Modulus

    77 – 80


    Storage Life

    31 – 35


    Specific Gravity

    69 and 70


    Stress Modulus

    81 – 84


    Tensile Strength and Ultimate Elongation

    44 – 48


    Thermal Endurance

    92 and 93


    Volume Resistivity

    71 – 74


    Water Absorption

    75 and 76


    Melting Point

    100 – 104


    1.3 The values stated in inch-pound units are to be regarded as standard, except for temperature, which shall be expressed in degrees Celsius. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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. For specific hazard statements, see Section 5 and for fire test safety caveats see Test Methods D8355.

    Note 1: These test methods are similar, but not identical to, those in IEC 60684-2 (see also Note 9).

    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

    D257 Test Methods for DC Resistance or Conductance of Insulating Materials

    D412 Test Methods for Vulcanized Rubber and Thermoplastic ElastomersTension

    D570 Test Method for Water Absorption of Plastics

    D618 Practice for Conditioning Plastics for Testing

    D746 Test Method for Brittleness Temperature of Plastics and Elastomers by Impact

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

    D876 Test Methods for Nonrigid Vinyl Chloride Polymer Tubing Used for Electrical Insulation

    D882 Test Method for Tensile Properties of Thin Plastic Sheeting

    D1535 Practice for Specifying Color by the Munsell System

    D1711 Terminology Relating to Electrical Insulation

    D3418 Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential Scanning Calorimetry

    D8355 Test Methods for Flammability of Electrical Insulating Materials Used for Sleeving or Tubing

    E176 Terminology of Fire Standards

    ICS Code

    ICS Number Code 29.120.99 (Other electrical accessories)

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

    DOI: 10.1520/D2671-21

    Citation Format

    ASTM D2671-21, Standard Test Methods for Heat-Shrinkable Tubing for Electrical Use, ASTM International, West Conshohocken, PA, 2021,

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