ASTM D668 - 12

    Standard Test Methods of Measuring Dimensions of Rigid Rods and Tubes Used for Electrical Insulation

    Active Standard ASTM D668 | Developed by Subcommittee: D09.07

    Book of Standards Volume: 10.01


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    Significance and Use

    4.1 These test methods are used to measure the dimensions of the rod or tube to determine conformance with specifications on full lengths or cut lengths. The measurements can also be used for manufacturing control, determination of uniformity, dimensional stability, and physical and electrical properties of the rods and tubes.

    1. Scope

    1.1 These test methods cover the measurement of the dimensions of all rigid rods and tubes used as electrical insulation, the limitations imposed being those of the size range of the more common forms of measuring instruments used.

    1.2 Where the number of tests to be made or the specifications covering the rod or tube justify its use, it is acceptable to use an accurately calibrated “go-and-no-go” ring gage of suitable size.

    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.


    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

    D374 Test Methods for Thickness of Solid Electrical Insulation

    D1711 Terminology Relating to Electrical Insulation


    ICS Code

    ICS Number Code 29.035.01 (Insulating materials in general)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard

    DOI: 10.1520/D0668-12

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D668-12, Standard Test Methods of Measuring Dimensions of Rigid Rods and Tubes Used for Electrical Insulation, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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