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This specification covers silver-coated, soft or annealed, round copper wire, intended for use in electrical equipment. The silver-coated wires are classified according to the total weight of the coated wires, namely; Class A, B, C, D, and E. Tensile strength test, resistivity test, weight of coating, and dimensional measurements shall be performed to conform to the requirements specified.
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.
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 values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3.1 Exceptions—The SI values for density, resistivity, and volume are to be regarded as standard.
1.4 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 and Explanatory .
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.
B49 Specification for Copper Rod 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 Number Code 77.150.30 (Copper products)
UNSPSC Code 26121517(Copper wire)
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ASTM B298-12(2017), Standard Specification for Silver-Coated Soft or Annealed Copper Wire, ASTM International, West Conshohocken, PA, 2017, www.astm.orgBack to Top