ASTM B501-04

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Designation: B501 – 04
Standard Specification for
Silver-Coated, Copper-Clad Steel Wire for Electronic
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Application
This standard is issued under the fixed designation B501; 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.
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1. Scope 2.2 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor
1.1 This specification covers silver-coated, round, copper-
Materials
clad steel wire for electronic application.
B258 Specification for Nominal Diameters and Cross-
1.2 Silver coatings in mass percentages of the total mass of
SectionalAreas ofAWG Sizes of Solid Round Wires Used
the coated wire are as follows: 1.25, 2.5, 4.0, 6.1, and 8.0.
as Electrical Conductors
1.2.1 Silver-coated wire having different minimum percent-
B452 Specification for Copper-Clad Steel Wire for Elec-
age of silver by mass may be obtained by mutual agreement
tronic Application
between the manufacturer and the purchaser. For information
purposes, the thickness of coating in microinches provided by
3. Terminology
the mass percentages listed in 1.2 is shown in Table 1.
3.1 Definitions of Terms Specific to This Standard:
1.3 Four classes of copper-clad steel wire are covered as
3.1.1 lot—any amount of wire of one class and size pre-
follows: Class 30HS nominal 30 % conductivity hard-drawn,
sented for acceptance at one time, such amount, however, not
Class 30A nominal 30 % conductivity annealed, Class 40HS
to exceed 10 000 lb (4500 kg) (Note 1).
nominal 40 % conductivity hard-drawn, and Class 40A nomi-
3.1.2 sample—a quantity of production units (coils, reels,
nal 40 % conductivity annealed.
and so forth) selected at random from the lot for the purpose of
1.4 The values stated in inch-pound units are to be regarded
determining conformance of the lot to the requirements of this
as the standard. The values given in parentheses are for
specification.
informationonlyexceptforresistivity,wheretheSIunitsareto
3.1.3 specimen—a length of wire removed for test purposes
be regarded as the standard.
from any individual production unit of the sample.
1.5 The following safety hazards caveat pertains to the test
method described in this specification. This standard does not
NOTE 1—Alotshouldcomprisematerialtakenfromaproductregularly
purport to address all of the safety problems, if any, associated meeting the requirements of this specification. Inspection of individual
lots of less than 500 lb (250 kg) of wire cannot be justified economically.
with its use. It is the responsibility of the user of this standard
For small lots of 500 lb (250 kg) or less, the purchaser may agree to the
to establish appropriate safety and health practices and
manufacturer’sregularinspectionoftheproductasawholeasevidenceof
determine the applicability of regulatory limitations prior to
acceptability of such small lots.
use. (Caution—Consideration should be given to toxicity and
flammability when selecting solvent cleaners.)
4. Ordering Information
4.1 Orders for material under this specification shall include
2. Referenced Documents
the following information:
2.1 The following documents of the issue in effect on date
4.1.1 Quantity of each size,
of material purchase form a part of this specification to the
4.1.2 Wire size (see 7.1 and Table 1),
extent referenced herein:
4.1.3 Class of basis wire (see 1.3),
4.1.4 Mass percentage of coating (see 1.2 and Table 1),
4.1.5 Package size (see Section 12),
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This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on
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Composite Conductors. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2004. Published September 2004. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1969. Last previous edition approved in 1999 as B509 – 99. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0501-04. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B501 – 04
TABLE 1 Silver Mass Percent and Thickness of Coating
Thickness of Silver, µin.
Diameter Cross-Sectional Area at 20°C
(for information only)
1.25 2.5 4.0 6.1 8.0
2 2
in. mm cmil in. mm
% % % % %
0.0720 1.829 5 180 0.00407 2.63 176 352 569 876 1 158
0.0641 1.628 4 110 0.00323 2.08 156 313 507 779 1 031
0.0571 1.450 3 260 0.00256 1.65 13
...