ASTM F269-60(2014)
(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.
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Designation: F269 − 60 (Reapproved 2014)
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
CurrenteditionapprovedJune1,2014.PublishedJuly2014.Originallyapproved
sagshallhaveaclean,brightsurfaceandshallbeatleast15in.
in 1952. Last previous edition approved in 2009 as F269 – 60 (2009). DOI:
10.1520/F0269-60R14. in length.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F269 − 60 (2014)
NOTE 3—Variables that influence temperature determination by electri-
4.2 Forming—With the
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F269 − 60 (Reapproved 2009) F269 − 60 (Reapproved 2014)
Standard Test Method for
Sag of Tungsten Wire
This standard is issued under the fixed designation F269; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. 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.
2. Apparatus
2.1 Bell Jar Envelope—A suitable envelope surrounding the test apparatus. The envelope may consist of a glass bell jar,
preferably of a heat resistant glass (Warning—A protective medium shall be provided over an exposed glass to prevent injury by
flying glass in the event of an explosion), or may be constructed of metal, in which case a transparent window shall be provided
in order that the behavior of the specimen under test may be observed. The envelope may be rigidly supported in a fixed position
or may by suspended in such a manner that it can be raised or lowered into position over the test apparatus. A means shall be
provided for maintaining within the envelope an atmosphere and steady supply flow of hydrogen. A flow meter shall be
incorporated in the hydrogen line so that measurement and control of the gas flow may be maintained. The hydrogen line shall
discharge at the upper levels of the envelope and shall be baffled by a suitable diffusing device so that no direct stream of the gas
will play upon the test specimens.
2.2 Specimen Support—A suitably designed support and clamping device for holding the specimen within the envelope during
testing. This support, which may be rigidly fixed or capable of being raised into or lowered from the envelope, shall be made from
a suitable metallic conductor so that electrical current from the power supply may be used to heat the test specimen. An insulated
clamping fixture shall be provided at the top of the support so that the hairpin test specimen will be firmly held. This clamping
device shall be capable of rotating 90° on its axis in order that the test specimen may be heated both in a vertical-position with
its apex down and in a horizontal position. A means shall be provided for accomplishing this rotation without requiring the removal
of the test specimen from the clamping fixture.
2.3 Weights—A set of weights comprising loads of 3, 4, 6, 7, 9, 10, and 13 lb (1.4, 1.8, 2.7, 3.2, 4.1, 4.5, and 5.9 kg). A hook
shall be provided for attaching the required weight to the apex of the test specimen. This hook should be made from tungsten wire
and should be capable of supporting the heaviest weight at the elevated temperature of testing, without fear of breaking.
NOTE 1—A tungsten wire with a diameter of 0.080 in. is recommended for use as a hook.
2.4 Cathetometer or any other suitable instrument for measurement of the vertical displacement of the test specimen that results
from the sag test. This instrument shall have a suitable scale so that movement of the specimen of as little as 0.5 mm may be read.
2.5 Power Supply—A supply of electric current sufficient to heat the test specimen to the required test temperatures. A meter
shall be provided in this supply to permit measurement of the current to an accuracy of 62 %.
3. Materials
3.1 Hydrogen used for the test atmosphere shall have a purity meeting the following requirements:
3 3
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.
3.1.2 Oxygen, not more than 10 ppm.
This test method is under the jurisdiction of ASTM Committee F01 on Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic Materials.
Current edition approved May 1, 2009June 1, 2014. Published July 20092014. Originally approved in 1952. Last previous edition approved in 20022009 as F269 – 60
(2002).(2009). DOI: 10.1520/F0269-60R09.10.1520/F0269-60R14.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F269 − 60 (2014)
3.1.3 Hydrocarbons ( plus CO and CO ), not more than 20 ppm.
3.1.4 Nitrogen, not more than ⁄2 %.
4. Test Specimen
4.1 Surface—The specimen of tungsten wire to be tested for sag sha
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