ASTM F180-94(2010)e1
(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 in diameter, or ribbons of similar thicknesses, for electronic devices.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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 2010)
Standard Test Method for
Density of Fine Wire and Ribbon Wire for Electronic
Devices
ThisstandardisissuedunderthefixeddesignationF180;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—This standard was converted to solely SI units editorially in December 2010.
1. Scope cylindrical in shape to within 0.0025 mm and of uniform
diameter and length. The length of the cylinder shall be
1.1 This test method covers the determination of, to an
approximately the same as the diameter and about 12.7 to 25.4
accuracy of 1.0%, the density of fine wires ranging from 0.25
mm.The surface of the cylinder shall be smooth and free from
to 0.02 mm in diameter, or ribbons of similar thicknesses, for
defects, pits, or cracks.The corners of the cylinder shall not be
electronic devices.
rounded.
1.2 The values stated in SI units are to be regarded as
3.4 Thermometer, capable of being read to 0.2°C within the
standard. No other units of measurement are included in this
range from 10 to 35°C.
standard.
3.5 Vacuum Pump and Desiccator —A vacuum pump ca-
1.3 This standard does not purport to address all of the
pable of producing a vacuum of 0.1 mm Hg and a vacuum
safety concerns, if any, associated with its use. It is the
desiccator.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3.6 Hook suspended by a fine wire about 0.08 mm in
bility of regulatory limitations prior to use. Specific hazard
diameter, both made of corrosion-resistant material, for sup-
statements are given in Section 4.
porting the test specimen while weighing it in the liquid.
2. Terminology 3.7 Cradle suspended by a fine wire about 0.08 mm in
diameter, both made of corrosion-resistant material, for sup-
2.1 Definitions:
porting the standard volume cylinder while weighing it in the
2.1.1 density—the weight per unit volume, expressed in
test liquid.
grams per cubic centimetre, in accordance with the following
equation:
4. Test Liquid
∆ 5 W/V
4.1 The test liquid in which the test specimen and standard
where:
volume cylinder are to be immersed while being weighed shall
∆ = density of the specimen
be pure, stable, and shall have a low viscosity, low surface
W = weight of the specimen, g, and
tension, low vapor pressure and a density of not less than 2
V = volume of the specimen, cm .
g/cm . Tetrabromoethane and tribromomethane have been
found satisfactory for this purpose.
3. Apparatus
4.2 Precaution These liquids are moderately toxic and
3.1 Balance—Asuitable chemical balance capable of being
should only be used by those familiar with the hazards
read to 0.1 mg.
involved.
3.2 Micrometer, capable of being read to 0.002 mm.
4.2.1 Tests should be carried out under a fume hood. The
fluids used should be considered potentially dangerous.
3.3 Standard Volume Cylinder—Acylinder of standard vol-
ume made from corrosion-resistant material such as nickel, 4.2.2 Hazard—When treated, highly toxic fumes are given
off. Prolonged inhalation can cause unconsciousness.
4.2.3 Treatment—Fresh air; artificial respiration if uncon-
This test method is under the jurisdiction of ASTM Committee F01 on
scious; oxygen if required.
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials.
Current edition approved Dec. 1, 2010. Published January 2011. Originally
approved in 1943 as B180–43T. Last previous edition approved in 2005 as
F180–94(2005). DOI: 10.1520/F0180-94R10E01. 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
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F180 − 94 (2010)
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 1c 2 w /v
~ a l l!
recommended.
where:
6. Preparation of Specimen
d = density of test liquid, g/cm ,
w = weight of standard volume cylinder in air, g,
6.1 The wire or ribbon shall be wiped and loosely wound
a
c = weight of cradle in liquid, g,
into a small coil and bound with wire of the same composition l
w = weight of standard volume cylinder and its supporting
in such a manner that no loose ends project from the body of l
cradle in liquid, g, and
the coil in order to produce a compact coil sufficiently loosely
v = volume of standard cylinder, cm .
woundtopermitpenetrationofthetestliquiduponimmersion.
The test specimen shall be thoroughly cleaned of lubricants by
The density of most liquids varies considerably with the
washing or boiling in suitable solvents and thoroughly drying
temperature. If the weight of the specimen and the weight of
in an oven.
the cylinder have been determined at different temperatures, it
will be necessary to apply a temperature correction to obtain
7. Procedure
the density of the liquid
...
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