ASTM B470-02(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:B470 −02(Reapproved 2007)
Standard Specification for
Bonded Copper Conductors for Use in Hookup Wires for
Electronic Equipment
This standard is issued under the fixed designation B470; 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.
1. Scope 3.1.3 Special package marking if required (Section 8), and
3.1.4 Place of inspection (Section 7).
1.1 This specification covers stranded uninsulated bare, tin,
ortin-leadalloycoatedcopperconductorsinwhichwiresinthe
4. Conductor Constructions
strand are metallically bonded together by the application of
4.1 Conductor constructions shall conform to the applicable
heat or additional tin, or tin-lead alloy for use in hookup wire
for electronic equipment. constructions of Specification B286, except that in addition the
following bondings may be specified:
1.2 The SI values for density and resistivity are to be
4.1.1 Type I—Bare copper, stranded, light bonding,
regarded as standard. For all other properties, the inch-pound
4.1.2 Type II—Tin or tin-lead alloy coated copper, stranded,
values are to be regarded as the standard and the SI units may
light bonding, or
be approximate.
4.1.3 TypeIII—Tinortin-leadalloycoatedcopper,stranded,
1.3 The hazard caveat pertains only to Section 6 of this
heavy bonding.
specification. This standard does not purport to address all of
the safety concerns, if any, associated with its use. It is the
5. General Requirements
responsibility of the user of this standard to establish appro-
5.1 The conductors shall consist of tinned copper conform-
priate safety and health practices and determine the applica-
ing to the product description, quality and specification re-
bility of regulatory limitations prior to use.
quirements of Specification B286 and bare copper conforming
to the product description, quality and specification require-
2. Referenced Documents
ments of Specification B3.
2.1 The following documents of the issue in effect at the
5.2 Flex Life—The average of six flex tests specified in 6.1
time of reference form a part of this specification to the extent
shall meet the minimum requirements of Table 1 for the
referenced herein:
applicable type and construction.
2.2 ASTM Standards:
5.3 Fraying, Types I and II—After performing the test in
B3 Specification for Soft or Annealed Copper Wire
6.2,noseparationsofstrandsshallbevisibletotheunaidedeye
B286 Specification for Copper Conductors for Use in
(normal spectacles excepted), from the cut end to the point of
Hookup Wire for Electronic Equipment
bend nearest to that cut end.
3. Ordering Information
5.4 Mandrel Test, Type III Only (see Explanatory Note
3.1 Orders for material under this specification shall include
1)—After performing the test specified in 6.3 no separation of
the following information:
strands shall be visible to the unaided eye (normal spectacles
3.1.1 Quantity of each size, material, construction, and type
excepted).
(see 4.1),
3.1.2 Package size (see 8.1),
6. Test Methods
6.1 Flex Life—The testing equipment shall be designed and
This specification is under the jurisdiction of ASTM Committee B01 on
set up for operation so that steel mandrels shall be horizontal
Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on
and so positioned that any vertical movement of the specimen
Conductors of Copper and Copper Alloys.
is minimized. The conductor as clamped for test shall pass
Current edition approved March 15, 2007. Published April 2007. Originally
through the vertical center line between the mandrels.
approved in 1968. Last previous edition approved in 2002 as B470 – 02. DOI:
10.1520/B0470-02R07.
6.1.1 The conductor shall be bent repeatedly in alternating
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
directions in an arc of 60° on both sides of the vertical center
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
line of the mandrels, at a rate of 24 to 36 cpm, between
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. mandrels of size and spacing specified in Table 2. The
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B470−02 (2007)
TABLE 1 Flex Life Requirements, Minimum Cycles
7. Inspection
Un-
Type I
7.1 General—All test and inspections shall be made at the
bonded Type III
and II
place of manufacture unless otherwise agreed upon between
Construction (see (Heavy
(Light
Explanatory Bonding)
the manufacturer and the purchaser at the time of the purchase.
Bonding)
Note 5)
The manufacturer shall afford the inspector representing the
7 wire 40 30 20
purchaser all reasonable facilities to satisfy him that the
10 wire 55 40 25
16 wire 85 60 40 material is being furnished in accordance with this specifica-
19 or more wires 100 70 50
tion (Explanatory Note 4).
7.1.1 Unless otherwise agreed by the manufacturer and the
purchaser, conformance of the wire to the various requirements
TABLE 2 Conditions for Flex Test
listed in Section 5 shall be determined on samples taken from
Nominal
each lot of wire presented for acceptance.
Mandrel
Mandrel
Diameter 7.1.2 The manufacturer shall, if requested prior to inspec-
Size,
Spacing
Mass, g
(Explanatory
AWG
tion, certify that all wire in the lot made under such conditions
Note 4)
thattheproductasawholeconformstotherequirementsofthis
in. mm in. mm
specification as determined by regularly made and recorded
16 0.2344 5.954 0.065 1.65 1511
tests.
18 0.1875 4.762 0.056 1.42 951
20 0.1562 3.967 0.046 1.17 598
7.2 Terms Used for Inspection:
22 0.1250 3.175 0.037 0.94 376
24 0.0937 2.380 0.031 0.79 236
7.2.1 Lot—Alot is any amount of wire of one class and size
26 0.0625 1.588 0.026 0.66 149
presented for acceptance at one time, such amount, however,
not to exceed 10 000 lb (4500 kg).
7.2.2 Sample—A sample is a quantity of production units
(coils, reels, etc.) selected at random from the lot for the
mandrels must be so supported that the specified spacing
purpose of determining conformance of the lot to the require-
during test is maintained. Mandrel deflection must be avoided.
ments of this specificat
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