ASTM F205-94(2005)
(Test Method)Standard Test Method for Measuring Diameter of Fine Wire by Weighing
Standard Test Method for Measuring Diameter of Fine Wire by Weighing
ABSTRACT
This test method establishes the apparatus required, specimen preparation steps, and standard procedures and calculations involved in the measurement of the average diameter of fine wires by means of weighing a known length. This applies particularly to wires of specified sizes used in electron devices and lamps.
SCOPE
1.1 This test method covers the measurement of the average diameter of fine wire by weighing a known length; it applies particularly to sizes up to 0.13 mm (0.005 in.) used in electron devices and lamps.
1.2 The values stated in SI units are to be regarded as the standard. The values given in inch-pound units apply only for the diameter.
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.
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Designation:F205–94 (Reapproved 2005)
Standard Test Method for
Measuring Diameter of Fine Wire by Weighing
ThisstandardisissuedunderthefixeddesignationF205;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 Each test specimen shall be cut to a length of 200 6 0.1
mm. To prevent stretching, care shall be taken so that the
1.1 Thistestmethodcoversthemeasurementoftheaverage
tension is just sufficient to eliminate the sag and curl. Any
diameter of fine wire by weighing a known length; it applies
disagreement concerning the amount of tension to be used in
particularly to sizes up to 0.13 mm (0.005 in.) used in electron
cutting shall be resolved between the manufacturer and the
devices and lamps.
purchaser.
1.2 The values stated in SI units are to be regarded as the
4.4 The test specimen shall be folded upon itself several
standard. The values given in inch-pound units apply only for
times and twisted to make a compact bundle with loop
the diameter.
consisting of a single strand for hanging it on the balance
1.3 This standard does not purport to address all of the
beam.Inthecaseofmultiplespecimens,allspecimensshallbe
safety concerns, if any, associated with its use. It is the
twisted together and hung by a loop consisting of a single
responsibility of the user of this standard to establish appro-
strand.The specimen shall be handled as little as possible.The
priate safety and health practices and determine the applica-
operator’s hands shall be clean and dry.
bility of regulatory limitations prior to use.
5. Number of Specimens
2. Referenced Documents
5.1 Weigh a single specimen if its weight lies within the
2.1 ASTM Standards:
upper half of the scale of the instrument. When the weight is
F180 Test Method for Density of Fine Wire and Ribbon
less than half of the scale of the instrument, weigh a sufficient
Wire for Electronic Devices
number of specimens, 200 mm in length, simultaneously so
3. Apparatus
that the total weight will register in the upper half of the scale,
preferably as close to the limit of the balance as possible. Use
3.1 The apparatus shall consist of a suitable torsion or other
the lowest range instrument compatible with the weight of the
direct-readingbalancecapableofreadingto0.002mgor0.1%
200-mm weight specimen to reduce the number of 200-mm
of the weight to be weighed (whichever is larger), with an
lengths that must be weighed together.
accuracyof0.004mgor0.2%(whicheverislarger).Therange
of the balance (or the size of the specimen) shall be such that
6. Repetition of Weighing
the reading will lie within the upper half of the scale.
6.1 If the corrected weight of a single specimen lies within
4. Test Specimens
60.5%ofeithertheminimumorthemaximumlimitspecified
forthewireweight,cutandweightwomorespecimensofwire
4.1 Test specimens shall be selected at least 1 m from the
in a similar manner. When two or more lengths of wire have
end of a spool or sufficiently far from the end to be free from
beenweighedsimultaneouslytoproduceareadingintheupper
kinks or other damage resulting in lack of straightness of the
half of the scale because of the small size of the wire, cut and
cut length.
weigh two more sets of specimens in a similar manner.
4.2 The wire shall be drawn from the spool under a low
even tension so that no elongation of the wire takes place.
7. Calibration and Checking of the Balance
7.1 Check the balance regularly in accordance with the
This test method is under the jurisdiction of ASTM Committee F01 on
recommendations of the manufacturer.
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
7.2 Ifavarietyofweightsaretobedetermined,calibratethe
Materials.
balance at five major points on the scale and at zero by
Current edition approved Jan. 1, 2005. Published January 2005. Originally
approved in 1945 as B205 – 45 T. Last previous edition approved in 1999 as F205
determining the weights of calibrated check weights. If any
– 94(1999). DOI: 10.1520/F0205-94R05.
point is in error by more than 1 %, remove the balance from
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
serviceandrepairit.Applycorrectionsdeterminedbychecking
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
to the apparent readings to obtain corrected weights. Obtain
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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F205–94 (2005)
TABLE 1 Density and Constant K for Diameter Calculations
corrections applied to apparent weights by interpolation be-
A
tween the closest calibrated points, one above and one below Density, Constant
Alloy 3
g/cm
the reading.
K
7.3 If the amount of work to be weighed at one point on the
Aluminum + 1 % magnesium 2.7 1.912
scale justifies it, the balance may be calibrated with a standard Aluminum + 1 % silicon 2.7 1.912
Gold 19.32 0.715
weight(orcombinationofweights)deviatingbynotmorethan
85 % nickel, 15 % chromium 8.47 1.079
10% from that of the weight to be determined. In this case,
58 % nickel, 20 % molybdenum, 20 % 8.78 1.060
adjust the balance so that the balance reads the known weight iron, 2 % manganese
95 % nickel, 5 % manganese 8.74 1.063
of the check weight correctly when it is in balance, thereby
Permanickel 8.77 1.061
reducing the correction to zero.
Monel 8.81 1.058
7.4 Calibrate the balance, at zero under no load, or at Molybdenum 10.14 0.986
Tantalum 16.59 0.771
positive values when loaded to check weights, by using the
Tungsten 19.17 0.717
average of three consecutive readings, taken under conditions
A
The density values in this table have been determined by ASTM Test Method
specified in 7.2 or 7.3, whichever is applicable.
F180.
8. Calibration with Standard Weights
8.1 Check weights are subject to change of mass due to
multiple specimens are used, is found to lie between the point
wear from handling and use, and from chemical action result-
0.5%abovetheminimumlimitand0.5%belowthemaximum
ing from exposure. Depending on use, but not less than twice
limit, the wire shall be considered to meet the specified limits.
a year, compare the calibrated check weights with the primary
11.2 If the corrected wir
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