ASTM B188 - 15e1

    Standard Specification for Seamless Copper Bus Pipe and Tube

    Active Standard ASTM B188 | Developed by Subcommittee: B05.04

    Book of Standards Volume: 02.01

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    This specification covers seamless copper bus pipe and tube intended for use as electrical conductors. The material shall be manufactured by such hot-working, cold-working, and annealing processing as to produce a uniform, seamless wrought structure in the finished product. The method of manufacture shall be such that the finished material conforms to the specified temper properties. The material shall conform to the requirements for the copper UNS no. as specified. The material shall be furnished in either the O60 (soft anneal) or H80 (hard drawn) temper. The material shall conform to the maximum electrical resistivity requirements prescribed. The product shall conform to the prescribed mechanical property requirements. The product shall conform to the prescribed bend testing requirements. The test specimens of material designated as Copper UNS Nos. C10100, C10200, C10300, C10400, C10500, C10700, and C12000 shall be free of cuprous oxide. When tested, material designated as Copper UNS nos. C10100, C10200, C10300, C10400, C10500, C10700, and C12000 shall pass the embrittlement test. The product shall be passed through an eddy-current testing unit adjusted to provide information on the suitability of the product for the intended application.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Significance and Use

    18.1 For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.


    Rounded Unit for Calculated
    or Observed Value


     Chemical composition

    nearest unit in the last right-hand place of figures
      of the specified limit



     Electrical resistivity

    nearest unit in the last right-hand place of figures

     Electrical conductivity

     Tensile strength

    nearest ksi (5 MPa)

     Elongation: below 5 %

    nearest multiple of 0.5 %

     5 % and over

    nearest 1 %

    1. Scope

    1.1 This specification establishes the requirements for seamless copper bus pipe and tube intended for use as electrical conductors.

    1.1.1 The product shall be made from one of the following coppers, as denoted in the ordering information:2

    UNS No.2


    Type of Copper





    Oxygen-free, electronic



    Oxygen-free without residual deoxidants


    Oxygen-free, extra low phosphorus

      C10400, C10500,


    Oxygen-free, silver bearing



    Electrolytic tough pitch

      C11300, C11400,


    Silver-bearing tough pitch



    Phosphorized, low residual phosphorus

    1.2 Unless otherwise specified, any one of the above coppers may be furnished.

    1.3 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard.

    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

    B193 Test Method for Resistivity of Electrical Conductor Materials

    B428 Test Method for Angle of Twist in Rectangular and Square Copper and Copper Alloy Tube

    B577 Test Methods for Detection of Cuprous Oxide (Hydrogen Embrittlement Susceptibility) in Copper

    B601 Classification for Temper Designations for Copper and Copper Alloys--Wrought and Cast

    B846 Terminology for Copper and Copper Alloys

    E8/E8M Test Methods for Tension Testing of Metallic Materials

    E18 Test Methods for Rockwell Hardness of Metallic Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E53 Test Method for Determination of Copper in Unalloyed Copper by Gravimetry

    E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods)

    E243 Practice for Electromagnetic (Eddy Current) Examination of Copper and Copper-Alloy Tubes

    E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    ICS Code

    ICS Number Code 77.150.30 (Copper products)

    UNSPSC Code

    UNSPSC Code 40182000(Seamless copper tubes); 40171511(Commercial copper pipe)

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

    DOI: 10.1520/B0188-15E01

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM B188-15e1, Standard Specification for Seamless Copper Bus Pipe and Tube, ASTM International, West Conshohocken, PA, 2015,

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