ASTM F180-94(2005)
(Test Method)Standard Test Method for Density of Fine Wire and Ribbon Wire for Electronic Devices
Standard Test Method for Density of Fine Wire and Ribbon Wire for Electronic Devices
ABSTRACT
This test method establishes the standard procedures and calculations used (including precision and biases) for determining, to an accuracy of 1.0 %, the density of fine wires and ribbon wires that are used in electronic devices. This test method requires the use of the following apparatus: chemical balance, micrometer, standard volume cylinder, thermometer, vacuum pump and desiccator, and hook and cradle suspended by a fine wire.
SCOPE
1.1 This test method covers the determination of, to an accuracy of 1.0%, the density of fine wires ranging from 0.25 to 0.02 mm (0.010 to 0.001 in.) in diameter, or ribbons of similar thicknesses, for electronic devices.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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. Specific hazard statements are given in Section 4.
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Designation:F180–94 (Reapproved 2005)
Standard Test Method for
Density of Fine Wire and Ribbon Wire for Electronic
Devices
ThisstandardisissuedunderthefixeddesignationF180;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.3 Standard Volume Cylinder—A cylinder of standard
volume made from corrosion-resistant material such as nickel,
1.1 This test method covers the determination of, to an
cylindrical in shape to within 0.0025 mm (0.0001 in.) and of
accuracy of 1.0%, the density of fine wires ranging from 0.25
uniform diameter and length. The length of the cylinder shall
to 0.02 mm (0.010 to 0.001 in.) in diameter, or ribbons of
be approximately the same as the diameter and about 12.7 to
similar thicknesses, for electronic devices.
25.4 mm ( ⁄2 to 1 in.). The surface of the cylinder shall be
1.2 The values stated in SI units are to be regarded as the
smooth and free from defects, pits, or cracks. The corners of
standard. The values given in parentheses are for information
the cylinder shall not be rounded.
only.
3.4 Thermometer, capable of being read to 0.2°C within the
1.3 This standard does not purport to address all of the
range from 10 to 35°C.
safety concerns, if any, associated with its use. It is the
3.5 Vacuum Pump and Desiccator—A vacuum pump ca-
responsibility of the user of this standard to establish appro-
pable of producing a vacuum of 0.1 mm Hg and a vacuum
priate safety and health practices and determine the applica-
desiccator.
bility of regulatory limitations prior to use. Specific hazard
3.6 Hook suspended by a fine wire about 0.08 mm (0.003
statements are given in Section 4.
in.) in diameter, both made of corrosion-resistant material, for
2. Terminology supporting the test specimen while weighing it in the liquid.
3.7 Cradle suspended by a fine wire about 0.08 mm (0.003
2.1 Definition:
in.) in diameter, both made of corrosion-resistant material, for
2.1.1 density—the weight per unit volume, expressed in
supporting the standard volume cylinder while weighing it in
grams per cubic centimetre, in accordance with the following
the test liquid.
equation:
D5 W/V
4. Test Liquid
4.1 The test liquid in which the test specimen and standard
where:
volume cylinder are to be immersed while being weighed shall
D = density of the specimen
W = weight of the specimen, g, and be pure, stable, and shall have a low viscosity, low surface
V = volume of the specimen, cm . tension, low vapor pressure and a density of not less than 2
g/cm . Tetrabromoethane and tribromomethane have been
3. Apparatus
found satisfactory for this purpose.
3.1 Balance—Asuitable chemical balance capable of being
4.2 Precaution —These liquids are moderately toxic and
read to 0.1 mg. should only be used by those familiar with the hazards
3.2 Micrometer, capable of being read to 0.002 mm (0.0001
involved.
in.) 4.2.1 Tests should be carried out under a fume hood. The
fluids used should be considered potentially dangerous.
4.2.2 Hazard—When treated, highly toxic fumes are given
off. Prolonged inhalation can cause unconsciousness.
This test method is under the jurisdiction of ASTM Committee F01 on
4.2.3 Treatment—Fresh air; artificial respiration if uncon-
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials. scious; oxygen if required.
Current edition approved Jan. 1, 2005. Published January 2005. Originally
approved in 1943 as B180–43T. Last previous edition approved in 1999 as
F180–94(1999). DOI: 10.1520/F0180-94R05. See Sax, N. I., Handbook of Dangerous Materials, 1951.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F180–94 (2005)
5. Test Specimen 8. Calculation
5.1 The preferred length of wire or ribbon required for the 8.1 Density of Test Liquid—The density of the test liquid
test specimen shall be such that the volume is approximately shall be calculated as follows:
3 3
0.5 cm . The use of a specimen of less than 0.2 cm is not
d 5 ~w 1 c 2 w !/v
a l l
recommended.
where:
d = density of test liquid, g/cm ,
6. Preparation of Specimen
w = weight of standard volume cylinder in air, g,
a
6.1 The wire or ribbon shall be wiped and loosely wound
c = weight of cradle in liquid, g,
l
into a small coil and bound with wire of the same composition
w = weight of standard volume cylinder and its support-
l
in such a manner that no loose ends project from the body of
ing cradle in liquid, g, and
the coil in order to produce a compact coil sufficiently loosely
v = volume of standard cylinder, cm .
wound to permit penetration of the test liquid upon immersion.
The density of most liquids varies considerably with the
The test specimen shall be thoroughly cleaned of lubricants by
temperature. If the weight of the specimen and the weight of
washing or boiling in suitable solvents and thoroughly drying
the cylinder have been determined at different temperatures, it
in an oven.
will be necessary to ap
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