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ASTM F269-60(2009)

(Test Method)

Standard Test Method for Sag of Tungsten Wire

Standard Test Method for Sag of Tungsten Wire

ABSTRACT
This test method covers a determination of the sag properties of tungsten wire. The specimen of tungsten wire to be tested for sag shall have a clean, bright surface and should have the required length. With the aid of external heat, the test specimen shall be bent into a hairpin-shape until it reached the required distance between the ends. The formed test specimen shall be of sufficient length so that when clamped in the fixture, the exposed lengths measured from the top of the apex will be of required distance.
SCOPE
1.1 This test method covers a determination of the sag properties of tungsten wire 0.030 in. (0.76 mm) and over in diameter.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2009
ICS
29.060.10 - Wires
Technical Committee
F01 - Electronics
Drafting Committee
F01.03 - Metallic Materials, Wire Bonding, and Flip Chip
Current Stage
Ref Project

Relations

Replaces
ASTM F269-60(2002) - Standard Test Method for Sag of Tungsten Wire
Effective Date
01-May-2009
Replaced By
ASTM F269-60(2014) - Standard Test Method for Sag of Tungsten Wire
Effective Date
01-Jun-2014
Referred By
ASTM F288-96(2019) - Standard Specification for Tungsten Wire for Electron Devices and Lamps
Effective Date
01-May-2009

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ASTM F269-60(2009) - Standard Test Method for Sag of Tungsten Wire
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F269 − 60(Reapproved 2009)
Standard Test Method for
Sag of Tungsten Wire
ThisstandardisissuedunderthefixeddesignationF269;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 capable of being raised into or lowered from the envelope,
shall be made from a suitable metallic conductor so that
1.1 This test method covers a determination of the sag
electrical current from the power supply may be used to heat
properties of tungsten wire 0.030 in. (0.76 mm) and over in
the test specimen. An insulated clamping fixture shall be
diameter.
provided at the top of the support so that the hairpin test
1.2 The values stated in inch-pound units are to be regarded
specimen will be firmly held. This clamping device shall be
as standard. The values given in parentheses are mathematical
capable of rotating 90° on its axis in order that the test
conversions to SI units that are provided for information only
specimen may be heated both in a vertical-position with its
and are not considered standard.
apex down and in a horizontal position. A means shall be
1.3 This standard does not purport to address all of the provided for accomplishing this rotation without requiring the
safety concerns, if any, associated with its use. It is the
removal of the test specimen from the clamping fixture.
responsibility of the user of this standard to consult and
2.3 Weights—Asetofweightscomprisingloadsof3,4,6,7,
establish appropriate safety and health practices and deter-
9,10,and13lb(1.4,1.8,2.7,3.2,4.1,4.5,and5.9kg).Ahook
mine the applicability of regulatory limitations prior to use.
shall be provided for attaching the required weight to the apex
of the test specimen. This hook should be made from tungsten
2. Apparatus
wire and should be capable of supporting the heaviest weight
2.1 BellJarEnvelope—Asuitableenvelopesurroundingthe
attheelevatedtemperatureoftesting,withoutfearofbreaking.
test apparatus. The envelope may consist of a glass bell jar,
NOTE 1—Atungsten wire with a diameter of 0.080 in. is recommended
preferably of a heat resistant glass (Warning—A protective
for use as a hook.
medium shall be provided over an exposed glass to prevent
2.4 Cathetometer or any other suitable instrument for mea-
injury by flying glass in the event of an explosion), or may be
surement of the vertical displacement of the test specimen that
constructed of metal, in which case a transparent window shall
results from the sag test. This instrument shall have a suitable
be provided in order that the behavior of the specimen under
scale so that movement of the specimen of as little as 0.5 mm
test may be observed. The envelope may be rigidly supported
may be read.
in a fixed position or may by suspended in such a manner that
itcanberaisedorloweredintopositionoverthetestapparatus. 2.5 Power Supply—Asupply of electric current sufficient to
Ameansshallbeprovidedformaintainingwithintheenvelope
heat the test specimen to the required test temperatures. A
an atmosphere and steady supply flow of hydrogen. A flow meter shall be provided in this supply to permit measurement
meter shall be incorporated in the hydrogen line so that
of the current to an accuracy of 62%.
measurement and control of the gas flow may be maintained.
3. Materials
The hydrogen line shall discharge at the upper levels of the
envelope and shall be baffled by a suitable diffusing device so
3.1 Hydrogen used for the test atmosphere shall have a
that no direct stream of the gas will play upon the test
purity meeting the following requirements:
specimens.
3.1.1 Moisture (water), not more than 2.5 g/1000 ft (2.5
g/28 m ) as indicated by a dew point of−65°C or below.
2.2 Specimen Support—A suitably designed support and
3.1.2 Oxygen, not more than 10 ppm.
clamping device for holding the specimen within the envelope
3.1.3 Hydrocarbons (plus CO and CO ), not more than 20
during testing. This support, which may be rigidly fixed or
ppm.
3.1.4 Nitrogen, not more than ⁄2 %.
This test method is under the jurisdiction of ASTM Committee F01 on
4. Test Specimen
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials .
4.1 Surface—Thespecimenoftungstenwiretobetestedfor
CurrenteditionapprovedMay1,2009.PublishedJuly2009.Originallyapproved
sagshallhaveaclean,brightsurfaceandshallbeatleast15in.
in 1952. Last previous edition approved in 2002 as F269 – 60 (2002). DOI:
10.1520/F0269-60R09. in length.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F269 − 60 (2009)
NOTE 3—Variables that influence temperature determinati
...

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This test method covers a determination of the sag properties of tungsten wire. The specimen of tungsten wire to be tested for sag shall have a clean, bright surface and should have the required length. With the aid of external heat, the test specimen shall be bent into a hairpin-shape until it reached the required distance between the ends. The formed test specimen shall be of sufficient length so that when clamped in the fixture, the exposed lengths measured from the top of the apex will be of required distance.
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SCOPE
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SCOPE
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