ASTM B33-00
(Specification)Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes
Standard Specification for Tinned Soft or Annealed Copper Wire for Electrical Purposes
SCOPE
1.1 This specification covers tinned, round, soft or annealed copper wire for electrical purposes.
1.2 The SI values for density and resistivity are to be regarded as standard. For all other properties the inch-pound values are to be regarded as the standard and the SI units may be approximate.
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Designation: B 33 – 00
Standard Specification for
Tinned Soft or Annealed Copper Wire for Electrical
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Purposes
This standard is issued under the fixed designation B 33; 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 specification, the tin shall be considered “commercially pure”
if the total of other elements, exclusive of copper, does not
1.1 This specification covers tinned, round, soft, or annealed
exceed 1%. Notwithstanding the previous sentence, chemical
copper wire for electrical purposes.
analysis of the tin coating or of the tin used for coating shall not
1.2 The SI values for density and resistivity are to be
be required under this specification. Adequacy of the tin
regarded as standard. For all other properties the inch-pound
coating is assured by the continuity of coating and adherence of
values are to be regarded as the standard and the SI units may
coating requirements (see 5.4 and 5.5, respectively).
be approximate.
4.2 Copper-Base Metal—The base metal shall be copper of
2. Referenced Documents
such quality and purity that the finished product shall have
properties and characteristics prescribed in this specification.
2.1 ASTM Standards:
B 49 Specification for Copper Redraw Rod for Electrical
NOTE 1—Specification B 49 defines copper suitable for use.
2
Purposes
4.3 Copper bars of special qualities, forms, or types, as may
B 193 Test Method for Resistivity of Electrical Conductor
be agreed upon between the manufacturer and the purchaser,
3
Materials
and which will conform to the requirements prescribed in this
B 258 Specification for Standard Nominal Diameters and
specification, may also be used.
Cross-Sectional Areas of AWG Sizes of Solid Round Wires
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Used as Electrical Conductors
5. General Requirements (See Section 8)
2.2 Other Document:
5.1 Tensile Strength and Elongation (Explanatory Note 2
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NBS Handbook 100– Copper Wire Tables
and Note 3)—The tinned wire shall conform to the require-
ments for elongation prescribed in Table 1. No requirements
3. Ordering Information
for tensile strength are specified. For wire whose nominal
3.1 Orders for material under this specification shall include
diameter is more than 0.001 in. (1 mil) (0.025 mm) greater than
the following information:
a size listed in Table 1, but less than that of the next larger size,
3.1.1 Quantity of each size,
the requirements of the next larger size shall apply.
3.1.2 Wire size-diameter in inches (see 5.3 and Table 1),
5.2 Resistivity (Explanatory Note 1 and Note 4)—The
3.1.3 Type of copper, if special (see 4.2),
electrical resistivity of tinned wire at a temperature of 20°C
3.1.4 Package size (see 10.1),
shall not exceed the values prescribed in Table 2.
3.1.5 Special packaging marking, if required, and
5.3 Dimensions and Permissible Variations (Explanatory
3.1.6 Place of inspection (see 7.1).
Note 2)—The wire sizes shall be expressed as the diameter of
the wire in decimal fractions of an inch to the nearest 0.0001 in.
4. Material
(0.1 mil) or in millimetres to the nearest 0.0025 mm. The
4.1 Tin for Coating— The tin used for coating shall be
tinned wire shall not vary from the specified diameter by more
commercially pure (Explanatory Note 1). For purposes of this
than the amounts prescribed in Table 3.
5.4 Continuity of Coating—The tin coating shall be con-
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This specification is under the jurisdiction of ASTM Committee B-1 on
tinuous. The continuity of coating on the wire shall be
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
determined on representative samples taken before stranding or
Conductors of Copper and Copper Alloys.
insulating. The continuity of tinning shall be determined by the
Current edition approved April 10, 2000. Published June 2000. Originally
hydrochloric acid-sodium polysulfide test in accordance with
published as B 33 – 19 T. Last previous edition B 33 – 94.
2
Annual Book of ASTM Standards, Vol 02.01.
6.4.
3
Annual Book of ASTM Standards, Vol 02.03.
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B33
TABLE 1 Tensile Requirements TABLE 3 Permissible Variations in Diamter
Diameter Area at 20°C Permissible Variations in Diameter
Nominal Diameter of Wire
Elongation in. mm
in 10 in. in. mm plus minus plus minus
(250 mm), Under 0.0100 Under 0.25 0.0003 0.00010 0.
...
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