ASTM F205-94(1999)

Standard Test Method for Measuring Diameter of Fine Wire by Weighing

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.

General Information

• Status: Historical
• Publication Date: 09-Dec-1999
• ICS: 29.060.10 - Wires
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaced By: ASTM F205-94(2005) - Standard Test Method for Measuring Diameter of Fine Wire by Weighing
• Effective Date: 01-Jan-2005
• Referred By: ASTM F290-94(2020) - Standard Specification for Round Wire for Winding Electron Tube Grid Laterals
• Effective Date: 10-Dec-1999
• Referred By: ASTM B682-01(2016) - Standard Specification for Standard Metric Sizes of Electrical Conductors
• Effective Date: 10-Dec-1999
• Referred By: ASTM B258-18 - Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors
• Effective Date: 10-Dec-1999
• Referred By: ASTM F288-96(2019) - Standard Specification for Tungsten Wire for Electron Devices and Lamps
• Effective Date: 10-Dec-1999
• Referred By: ASTM F219-96(2018) - Standard Test Methods of Testing Fine Round and Flat Wire for Electron Devices and Lamps (Withdrawn 2023)
• Effective Date: 10-Dec-1999
• Referred By: ASTM F72-21 - Standard Specification for Gold Wire for Semiconductor Lead Bonding (Withdrawn 2024)
• Effective Date: 10-Dec-1999
• Referred By: ASTM F289-96(2019) - Standard Specification for Molybdenum Wire and Rod for Electronic Applications
• Effective Date: 10-Dec-1999
• Referred By: ASTM F73-96(2017) - Standard Specification for Tungsten-Rhenium Alloy Wire for Electron Devices and Lamps
• Effective Date: 10-Dec-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F 205–94 (Reapproved 1999)
Standard Test Method for
Measuring Diameter of Fine Wire by Weighing
This standard is issued under the fixed designation F 205; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope tension is just sufficient to eliminate the sag and curl. Any
disagreement concerning the amount of tension to be used in
1.1 Thistestmethodcoversthemeasurementoftheaverage
cutting shall be resolved between the manufacturer and the
diameter of fine wire by weighing a known length; it applies
purchaser.
particularly to sizes up to 0.13 mm (0.005 in.) used in electron
4.4 The test specimen shall be folded upon itself several
devices and lamps.
times and twisted to make a compact bundle with loop
1.2 The values stated in SI units are to be regarded as the
consisting of a single strand for hanging it on the balance
standard. The values given in inch-pound units apply only for
beam.Inthecaseofmultiplespecimens,allspecimensshallbe
the diameter.
twisted together and hung by a loop consisting of a single
1.3 This standard does not purport to address all of the
strand.The specimen shall be handled as little as possible.The
safety concerns, if any, associated with its use. It is the
operator’s hands shall be clean and dry.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Number of Specimens
bility of regulatory limitations prior to use.
5.1 Weigh a single specimen if its weight lies within the
2. Referenced Documents upper half of the scale of the instrument. When the weight is
less than half of the scale of the instrument, weigh a sufficient
2.1 ASTM Standards:
number of specimens, 200 mm in length, simultaneously so
F180 TestMethodforDensityofFineWireandRibbonfor
that the total weight will register in the upper half of the scale,
Electronic Devices
preferably as close to the limit of the balance as possible. Use
3. Apparatus
the lowest range instrument compatible with the weight of the
200-mm weight specimen to reduce the number of 200-mm
3.1 The apparatus shall consist of a suitable torsion or other
lengths that must be weighed together.
direct-readingbalancecapableofreadingto0.002mgor0.1%
of the weight to be weighed (whichever is larger), with an
6. Repetition of Weighing
accuracyof0.004mgor0.2%(whicheverislarger).Therange
6.1 If the corrected weight of a single specimen lies within
of the balance (or the size of the specimen) shall be such that
60.5%ofeithertheminimumorthemaximumlimitspecified
the reading will lie within the upper half of the scale.
forthewireweight,cutandweightwomorespecimensofwire
4. Test Specimens
in a similar manner. When two or more lengths of wire have
beenweighedsimultaneouslytoproduceareadingintheupper
4.1 Test specimens shall be selected at least 1 m from the
half of the scale because of the small size of the wire, cut and
end of a spool or sufficiently far from the end to be free from
weigh two more sets of specimens in a similar manner.
kinks or other damage resulting in lack of straightness of the
cut length.
7. Calibration and Checking of the Balance
4.2 The wire shall be drawn from the spool under a low
7.1 Check the balance regularly in accordance with the
even tension so that no elongation of the wire takes place.
recommendations of the manufacturer.
4.3 Each test specimen shall be cut to a length of 200 6 0.1
7.2 Ifavarietyofweightsaretobedetermined,calibratethe
mm. To prevent stretching, care shall be taken so that the
balance at five major points on the scale and at zero by
determining the weights of calibrated check weights. If any
This test method is under the jurisdiction of ASTM Committee F-1 on
point is in error by more than 1 %, remove the balance from
Electronicsand is the direct responsibility of Subcommittee F01.03 on Metallic
serviceandrepairit.Applycorrectionsdeterminedbychecking
Materials.
to the apparent readings to obtain corrected weights. Obtain
Current edition approved Dec. 15, 1994. Published February 1995. Originally
published as B205 – 45T; redesignated F205 in 1955. Last previous edition F205
– 89.
Annual Book of ASTM Standards, Vol 10.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 205
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.
F 180.
8. Calibration with Standard Weights
0.5%abovetheminimumlimitand0.5%belowthemaximum
8.1 Check weights are subject to change of mass due to
limit, the wire shall be considered to meet the specified limits.
wear from handling and use, and from chemical action result-
11.2 If the corrected wire weight is under 0.5% below the
ing from exposure. Depending on use, but not less than twice
minimum limit or over 0.5% above the maximum limit, the
a year, compare the calibrated check weights with the primary
wire is considered not to meet the specified limits.
weights, calibrated by t
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