ASTM B298-12
(Specification)Standard Specification for Silver-Coated Soft or Annealed Copper Wire
Standard Specification for Silver-Coated Soft or Annealed Copper Wire
ABSTRACT
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.
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 Table 1 (Explanatory Note 1).TABLE 1 Tensile Requirements
Diameter,
in.
Area at 20°C
Elongation
in 10 in.,
min, %
Thickness of Coating, μin. (For Information Only)
cmils
in.2
Class A, 1.25
% Silver
Class B, 2.50
% Silver
Class C, 4.00
% Silver
Class D, 6.10
% Silver
Class E, 10.00
% 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
0.0508
2 580
0.00203
25
134
269
430
656
1 075
0.0453
2 050
0.00161
25
120
240
383
585
959
0.0403
1 620
0.00128
25
107
213
341
520
853
0.0359
1 290
0.00101
25
95
190
304
464
760
0.0320
1 020
0.000804
25
85
169
270
413
677
0.0285
812
0.000638
25
75
151
241
368
603
0.0253
640
0.000503
25
67
134
214
327
536
0.0226
511
0.000401
25
60
120
191
292
478
0.0201
404
0.00317
20
53
106
170
260
425
0.0179
320
0.000252
20
47
95
151
231
379
0.0159
253
0.000199
20
42
84
135
205
337
0.0142
202
0.000158
20
...
75
120
183
301
0.0126
159
0.000125
20
...
67
107
163
267
0.0113
128
0.000100
20
...
60
96
146
239
0.0100
100
0.0000785
20
...
53
85
129
212
0.0089
79.2
0.0000622
15
...
47
75
115
188
0.0080
64.0
0.0000503
15
...
42
68
103
169
0.0071
50.4
0.0000396
15
...
...
60
92
150
0.0063
39.7
0.0000312
15
...
...
53
81
133
0.0056
31.4
0.0000246
15
...
...
47
72
119
0.0050
25.0
0.0000196
15
...
...
42
65
106
0.0045
20.2
0.0000159
15
...
....
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Designation:B298 −12
Standard Specification for
1
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,
round copper wire, intended for use in electrical equipment, as time of reference form a part of this specification to the extent
referenced herein:
follows:
2
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.
B49Specification for Copper Rod Drawing Stock for Elec-
1.1.2 Class B—Wire whose silver coating is at least 2.50%
trical Purposes
of the total weight of the coated wire.
B193Test Method for Resistivity of Electrical Conductor
1.1.3 Class C—Wire whose silver coating is at least 4.00%
Materials
of the total weight of the coated wire.
B258 Specification for Nominal Diameters and Cross-
1.1.4 Class D—Wire whose silver coating is at least 6.10%
SectionalAreasofAWGSizesofSolidRoundWiresUsed
of the total weight of the coated wire.
as Electrical Conductors
1.1.5 Class E—Wirewhosesilvercoatingisatleast10.00%
E50Practices for Apparatus, Reagents, and Safety Consid-
of the total weight of the coated wire.
erations for Chemical Analysis of Metals, Ores, and
Related Materials
1.2 Silver-coated wire having different minimum percent-
agesofsilverbyweightmaybeobtainedbymutualagreement
3. Ordering Information
between the manufacturer and the purchaser. For information
3.1 Ordersformaterialunderthisspecificationshallinclude
purposes the thickness of coating in microinches provided by
the following information:
the percentages listed above is shown in Table 1 (Explanatory
3.1.1 Quantity of each size,
Note 1).
3.1.2 Wire size, diameter in inches (see 5.3 and Table 1),
1.3 The values stated in inch-pound units are to be regarded
3.1.3 Class of coating (Section 1 and Table 1),
as standard. The values given in parentheses are mathematical
3.1.4 Type of copper, if special (see 4.2),
conversions to SI units that are provided for information only
3.1.5 Place of inspection (see 9.1), and
and are not considered standard.
3.1.6 Packaging and Package Marking (Section 10).
1.3.1 Exceptions—The SI values for density, resistivity, and
3.1.7 In addition supplementary requirements shall apply
volume are to be regarded as standard.
onlywhenspecifiedbythepurchaserintheinquiry,contract,or
1.4 The following precautionary caveat pertains only to the
purchase order for direct procurement by agencies of the U.S.
testmethodsectionofthisspecification: This standard does not Government (see S1, S2, and S3).
purport to address all of the safety concerns, if any, associated
4. Materials and Manufacture
with its use. It is the responsibility of the user of this standard
to establish appropriate safety and health practices and
4.1 The material shall be silver-coated copper wire (Ex-
determine the applicability of regulatory limitations prior to
planatory Note 2), of such quality and purity that the finished
use. For specific precautionary statements see 8.4.1.2 and
product shall have the properties and characteristics prescribed
Explanatory Note 2.
in this specification.
NOTE 1—The following specifications define copper suitable for use:
Specification B49.
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
2
Conductors of Copper and Copper Alloys. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 15, 2012. Published November 2012. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1955. Last previous edition approved in 2007 as B298–07. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0298-12. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B298−12
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 60
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B298 − 07 B298 − 12
Standard Specification for
1
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. A number 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
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 Table 1 (Explanatory Note 1).
1.3 The SI values of resistance and density are to be regarded as standard. For all other properties values values stated in
inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that
are provided for information purposes only.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 8.4.1.2 and Explanatory Note 2.
2. Referenced Documents
2.1 The following documents of the issue in effect at the time of reference form a part of this specification to the extent
referenced herein:
2
2.2 ASTM Standards:
B4B49 Specification Tough-Pitch Lake Copper-Refinery Shapesfor Copper Rod Drawing Stock for Electrical Purposes
(Withdrawn 1981)
B5 Specification for High Conductivity Tough-Pitch Copper Refinery Shapes
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
3. Ordering Information
3.1 Orders for material under this specification shall include the following information:
3.1.1 Quantity of each size,
3.1.2 Wire size, diameter in inches (see 5.3 and Table 1),
1
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on Conductors
of Copper and Copper Alloys.
Current edition approved May 15, 2007Nov. 15, 2012. Published June 2007November 2012. Originally approved in 1955. Last previous edition approved in 19992007
ε1
as B298 – 99B298 – 07. . DOI: 10.1520/B0298-07.10.1520/B0298-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B298 − 12
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 1
...
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