ASTM B624-99

Standard Specification for High-Strength, High-Conductivity Copper-Alloy Wire for Electronic Application

SCOPE
1.1 This specification covers high-strength, high-conductivity round copper-alloy wire 0.0031 to 0.0720 in. (0.079 to  
1.829 mm) in diameter, used for electronic hookup wire. The tensile strength of the wire is 60 ksi (414 MPa) minimum and the electrical conductivity at 20°C is 85% IACS minimum.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 09-Apr-1999
• ICS: 29.060.10 - Wires
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.04 - Conductors of Copper and Copper Alloys

Relations

• Replaced By: ASTM B624-99(2005)e1 - Standard Specification for High-Strength, High-Conductivity Copper-Alloy Wire for Electronic Application
• Effective Date: 01-Mar-2005
• Referred By: ASTM B961-13(2019) - Standard Specification for Silver Coated Copper and Copper Alloy Stranded Conductors for Electronic Space Application
• Effective Date: 10-Apr-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B 624 – 99
Standard Specification for
High-Strength, High-Conductivity Copper-Alloy Wire for
Electronic Application
This standard is issued under the fixed designation B 624; 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 (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.
1. Scope teristics prescribed in this specification. Chemical analysis of a
specific alloy is not a requirement of this specification unless
1.1 This specification covers high-strength, high-
definite agreement is reached between the manufacturer and
conductivity round copper-alloy wire 0.0031 to 0.0720 in.
the purchaser in the placing of individual orders.
[0.079 to 1.829 mm] in diameter, used for electronic hookup
wire. The tensile strength of the wire is 60 ksi [414 MPa]
5. General Requirements General Requirements
minimum and the electrical conductivity at 20°C is 85 % IACS
5.1 Tensile Properties—The minimum breaking strength
minimum.
and elongation of the conductor shall be as prescribed in Table
1.2 The values stated in inch-pound units are to be regarded
1. Breaking strengths of intermediate sizes may be calculated
as the standard. The values given in parentheses are for
in accordance with Explanatory Note 1.
information only.
5.2 Electrical Resistance—The electrical resistance of the
1.3 This standard does not purport to address all of the
wire at a temperature of 20°C shall not exceed the values in
safety concerns, if any, associated with its use. It is the
Table 1. Resistances of intermediate sizes may be calculated in
responsibility of the user of this standard to establish appro-
accordance with Explanatory Note 2.
priate safety and health practices and determine the applica-
5.3 Diameter—The wire size shall be expressed as the
bility of regulatory limitations prior to use.
diameter of the wire in decimal fractions of an inch to the
2. Referenced Documents nearest 0.0001 in. [0.003 mm]. For diameters under 0.0100 in.
[0.254mm],thewireshallnotvaryfromthespecifieddiameter
2.1 ASTM Standards:
by more than6 0.0001 in. For diameters 0.0100 in. and over,
B 193 Test Method for Resistivity of Electrical Conductor
2 the wire shall not vary from the specified diameter by more
Materials
than 61 %, expressed to the nearest 0.0001 in.
E8 Test Methods forTensionTesting of Metallic Materials
5.4 Joints—Joints necessary to processing shall be of such
3. Ordering Information
quality that all requirements of this specification are met.
5.5 Finish—The finished material shall be free of defects
3.1 Orders for wire furnished to this specification shall
that detract from the normal end use or longevity of the
include the following information:
product.Thematerialshallbesmooth,bright,clean,andfreeof
3.1.1 Quantity (pounds or kilograms),
laps, slivers, seams, scratches, and other imperfections not
3.1.2 Wire size (Table 1),
consistent with good commercial practice.
3.1.3 Place of inspection (Section 7),
3.1.4 Package size (Section 9), and
6. Test Method
3.1.5 Special marking, if required (Section 9).
6.1 Breaking Strength and Elongation—Conduct tension
4. Materials and Manufacture
and elongation tests in accordance with Test MethodsE8 and
with a rate of loading not to exceed 10 in./min [250 mm/min].
4.1 The wire shall be copper alloy of such quality and purity
The breaking strength shall equal or exceed the value specified
that the finished product shall have the properties and charac-
in Table 1.
6.2 Resistance—MeasureresistanceinaccordancewithTest
This specification is under the jurisdiction of ASTM Committee B-1 on
Method B 193.
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
6.3 Diameter—Make diameter measurements with a mi-
Conductors of Copper and Copper Alloys.
crometer caliper equipped with a vernier graduated in 0.0001
Current edition approved April 10, 1999. Published June 1999. Originally
in. or 0.002 mm. Gage each coil in three places, one near each
published as B 624 – 77. Last previous edition B 624 – 92.
Annual Book of ASTM Standards, Vol 02.03.
Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 624–99
TABLE 1 Tensile Properties and Resistance
Nominal Diameter Breaking Strength, min Elongation, Resistance, max, at 20°C
min,%in10in.
in. mm lbf N V/1000 ft V/km
or 250 mm
0.0720 1.829 239 1065 9 2.40 7.88
0.0641 1.628 190 844 9 3.03 9.94
0.0571 1.450 151 670 9 3.82 12.5
0.0508 1.290 119 530 9 4.82 15.8
0.0453 1.151 94.8 422 9 6.08 19.9
0.0403 1.024 75.0 334 9 7.66 25.1
0.0359 0.912 59.5 265 9 9.68 31.7
0.0320 0.813 47.3 210 9 12.1 39.9
0.0285 0.724 37.5 167 9 15.3 50.2
0.0253 0.643 29.6 132 9 19.5 63.7
0.0226 0.574 23.6 105 9 24.3 80.0
0.0201 0.511 18.7 83.1 9 30.8 101
0.0179 0.455 14.8 65.8 9 38.9 128
0.0159 0.404 11.7 52.0 9 49.5 161
0.0142 0.361 9.31 41.4 9 61.4 202
0.0126 0.320 7.33 32.6 9 78.1 257
0.0113 0.287 5.90 26.2 8 97.3 320
0.0100 0.254 4.62 20.6 8 124 408
0.0089 0.226 3.65 16.2 8 158 517
0.0080 0.203 2.94 13.1 195 643
0.0071 0.180 2.31 10.3 8 249 820
0.0063 0.160 1.81 8.1 8 317 1040
0.0056 0.142 1.43 6.3 8 403 1330
0.0050 0.127 1.13 5.0 7 508 1670
0.0045 0.114 0.91 4.0 7 630 2080
0.0040 0.102 0.72 3.2 7 802 2610
0.0035 0.089 0.54 2.4 7 1060 3450
0.0031 0.079 0.42 1.9 7 1360 4410
end and one near the center. From each spool, unreel approxi- manufactured under essentially the same conditions at essen-
mately 12 ft [4 m] and gage the wire in six places between the tially the same time. The amount in any case shall not exceed
second and twelfth foot from the end. The average of the 100 production units.
measurements obtained shall be considered the wire size 7.2.2 Sample—A sample is a quantity of production units
specified in 5.3. (coils, reels, and so forth) selected at random from the lot for
the purpose of determining conformance of the lot to the
7. Inspection
requirements of this specification.
7.2.3 Specimen—A specimen is a length of wire removed
7.1 General—All tests and inspections shall be made at the
for test purposes from any individual production unit of the
place of manufacture unless otherwise agreed upon between
sample.
themanufacturerandthepurchaseratthetimeofpurchase.The
7.3 Sample Size— The number of production units in a
manufacturer shall afford the inspector representing the pur-
sample shall be as
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