ASTM B298-07

    Standard Specification for Silver-Coated Soft or Annealed Copper Wire


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    1. Scope

    1.1 This specification covers silver-coated, soft or annealed, round copper wire, intended for use in electrical equipment, as follows:

    1.1.1 Class A - Wire whose silver coating is at least 1.25 % of the total weight of the coated wire.

    1.1.2 Class B - Wire whose silver coating is at least 2.50 % of the total weight of the coated wire.

    1.1.3 Class C - Wire whose silver coating is at least 4.00 % of the total weight of the coated wire.

    1.1.4 Class D - Wire whose silver coating is at least 6.10 % of the total weight of the coated wire.

    1.1.5 Class E - Wire whose silver coating is at least 10.00 % of the total weight of the coated wire.

    1.2 Silver-coated wire having different minimum percentages of silver by weight may be obtained by mutual agreement between the manufacturer and the purchaser. For information purposes the thickness of coating in microinches provided by the percentages listed above is shown in (Explanatory ).

    1.3 The SI values of resistance and density are to be regarded as standard. For all other properties values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.

    The following precautionary caveat pertains only to the test method section of this specification: 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. For specific precautionary statements see Table 1 and Explanatory Note 1.


    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

    B49 Specification for Copper Rod Drawing Stock for Electrical Purposes

    B193 Test Method for Resistivity of Electrical Conductor Materials

    B258 Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors

    E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials


    ICS Code

    ICS Number Code 77.150.30 (Copper products)

    UNSPSC Code

    UNSPSC Code 26121517(Copper wire)


    Referencing This Standard

    DOI: 10.1520/B0298-07

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM B298-07, Standard Specification for Silver-Coated Soft or Annealed Copper Wire, ASTM International, West Conshohocken, PA, 2007, www.astm.org

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