ASTM B298-07

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:B298 −07
StandardSpecification for
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Silver-Coated Soft or Annealed Copper Wire
This standard is issued under the fixed designation B298; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 2. Referenced Documents
2.1 The following documents of the issue in effect at the
1.1 Thisspecificationcoverssilver-coated,softorannealed,
time of reference form a part of this specification to the extent
round copper wire, intended for use in electrical equipment, as
referenced herein:
follows:
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2.2 ASTM Standards:
1.1.1 Class A—Wire whose silver coating is at least 1.25%
B4Specification Tough-Pitch Lake Copper-Refinery Shapes
of the total weight of the coated wire.
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(Withdrawn 1981)
1.1.2 Class B—Wire whose silver coating is at least 2.50%
B5Specification for High ConductivityTough-Pitch Copper
of the total weight of the coated wire.
Refinery Shapes
1.1.3 Class C—Wire whose silver coating is at least 4.00%
B193Test Method for Resistivity of Electrical Conductor
of the total weight of the coated wire.
Materials
1.1.4 Class D—Wire whose silver coating is at least 6.10%
B258 Specification for Nominal Diameters and Cross-
of the total weight of the coated wire.
SectionalAreasofAWGSizesofSolidRoundWiresUsed
1.1.5 Class E—Wirewhosesilvercoatingisatleast10.00%
as Electrical Conductors
of the total weight of the coated wire.
E50Practices for Apparatus, Reagents, and Safety Consid-
erations for Chemical Analysis of Metals, Ores, and
1.2 Silver-coated wire having different minimum percent-
Related Materials
agesofsilverbyweightmaybeobtainedbymutualagreement
between the manufacturer and the purchaser. For information
3. Ordering Information
purposes the thickness of coating in microinches provided by
3.1 Ordersformaterialunderthisspecificationshallinclude
the percentages listed above is shown in Table 1 (Explanatory
the following information:
Note 1).
3.1.1 Quantity of each size,
1.3 The SI values of resistance and density are to be 3.1.2 Wire size, diameter in inches (see 5.3 and Table 1),
regarded as standard. For all other properties values stated in
3.1.3 Class of coating (Section 1 and Table 1),
inch-poundunitsaretoberegardedasthestandard.Thevalues 3.1.4 Type of copper, if special (see 4.2),
given in parentheses are provided for information purposes
3.1.5 Place of inspection (see 9.1), and
only. 3.1.6 Packaging and Package Marking (Section 10).
3.1.7 In addition supplementary requirements shall apply
1.4 The following precautionary caveat pertains only to the
onlywhenspecifiedbythepurchaserintheinquiry,contract,or
testmethodsectionofthisspecification: This standard does not
purchase order for direct procurement by agencies of the U.S.
purport to address all of the safety concerns, if any, associated
Government (see S1, S2, and S3).
with its use. It is the responsibility of the user of this standard
to establish appropriate safety and health practices and
4. Materials and Manufacture
determine the applicability of regulatory limitations prior to
4.1 The material shall be silver-coated copper wire (Ex-
use. For specific precautionary statements see 8.4.1.2 and
planatory Note 2), of such quality and purity that the finished
Explanatory Note 2.
productshallhavethepropertiesandcharacteristicsprescribed
in this specification.
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This specification is under the jurisdiction of ASTM Committee B01 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Conductors of Copper and Copper Alloys. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 15, 2007. Published June 2007. Originally the ASTM website.
´1 3
approved in 1955. Last previous edition approved in 1999 as B298–99 . DOI: The last approved version of this historical standard is referenced on
10.1520/B0298-07. www.astm.org.
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B298−07
TABLE 1 Tensile Requirements
Area at 20°C Thickness of Coating, µin. (For Information Only)
Elongation
Diameter,
in 10 in.,
Class A, 1.25 Class B, 2.50 Class C, 4.00 Class D, 6.10 Class E, 10.00
2
in.
cmils in.
min, %
% Silver % Silver % Silver % Silver % Silver
0.1285 16 510 0.01297 30 340 680 1 090 1 659 2 720
0.1144 13 090 0.01028 30 303 605 970 1 477 2 42
...