ASTM B298-99e1

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e1
Designation: B 298 – 99
Standard Specification for
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Silver-Coated Soft or Annealed Copper Wire
This standard is issued under the fixed designation B 298; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
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e NOTE—Explanatory note references were corrected and an editorial change was made to Table1 in June 2004.
1. Scope 2. Referenced Documents
1.1 Thisspecificationcoverssilver-coated,softorannealed, 2.1 The following documents of the issue in effect at the
round copper wire, intended for use in electrical equipment, as time of reference form a part of this specification to the extent
follows: referenced herein:
1.1.1 Class A—Wire whose silver coating is at least 1.25% 2.2 ASTM Standards:
of the total weight of the coated wire. B 4 Specifications for Tough-Pitch Lake Copper—Re-
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1.1.2 Class B—Wire whose silver coating is at least 2.50% finery Shapes
of the total weight of the coated wire. B5 Specification for High Conductivity Tough-Pitch Cop-
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1.1.3 Class C—Wire whose silver coating is at least 4.00% per Refinery Shapes
of the total weight of the coated wire. B193 Test Method for Resistivity of Electrical Conductor
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1.1.4 Class D—Wire whose silver coating is at least 6.10% Materials
of the total weight of the coated wire. B258 Specification for Standard Nominal Diameters and
1.1.5 Class E—Wire whose silver coating is at least Cross-SectionalAreasofAWGSizesofSolidRoundWires
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10.00% of the total weight of the coated wire. Used as Electrical Conductors
1.2 Silver-coated wire having different minimum percent- E50 Practices forApparatus, Reagents, and Safety Precau-
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ages of silver by weight may be obtained by mutual agreement tions for Chemical Analysis of Metals
between the manufacturer and the purchaser. For information
3. Ordering Information
purposes the thickness of coating in microinches provided by
the percentages listed above is shown in Table 1 (Explanatory 3.1 Ordersformaterialunderthisspecificationshallinclude
the following information:
Note 1).
1.3 The SI values of resistance and density are to be 3.1.1 Quantity of each size,
3.1.2 Wire size, diameter in inches (see 5.3 and Table 1),
regarded as standard. For all other properties values stated in
inch-poundunitsaretoberegardedasthestandard.Thevalues 3.1.3 Class of coating (Section 1 and Table 1),
3.1.4 Type of copper, if special (see 4.2),
given in parentheses are provided for information purposes
only. 3.1.5 Place of inspection (see 9.1), and
3.1.6 Packaging and Package Marking (Section 10).
1.4 The following precautionary caveat pertains only to the
testmethodsectionofthisspecification:Thisstandarddoesnot 3.1.7 In addition supplementary requirements shall apply
onlywhenspecifiedbythepurchaserintheinquiry,contract,or
purport to address all of the safety concerns, if any, associated
with its use. It is the responsibility of the user of this standard purchase order for direct procurement by agencies of the U.S.
Government (see S1, S2, and S3).
to establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to
use. For specific precautionary statements see 8.4.1.2 and
Explanatory Note 1.
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This specification is under the jurisdiction of ASTM Committee B-1 on
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Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on Discontinued, see 1980 Annual Book of ASTM Standards, Part 6.
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Conductors of Copper and Copper Alloys. Annual Book of ASTM Standards, Vol 02.01.
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Current edition approved April 10, 1999. Published June 1999. Originally Annual Book of ASTM Standards, Vol 02.03.
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published as B298–55T. Last previous edition B298–94. Annual Book of ASTM Standards, Vol 03.05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B 298–99
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 2 422
0.1019 10 380 0.008155 25 270 539 864 1 316 2 157
0.0907† 8 230 0.00646 25 240 480 768 1 171 1 941
0.0808 6 530 0.00513 25 214 428 684 1 043 1 710
0.0720 5 180 0.00407 25 190 381 610 930 1 524
0.0641 4 110 0.00323 25 170 339 542 828 1 357
0.0571 3 260 0.00256 25 151 302 483 737 1 209
0.05
...