ASTM F269-60(2002)
(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 the standard. The values given in parentheses are for information only.
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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 269–60 (Reapproved 2002)
Standard Test Method for
Sag of Tungsten Wire
This standard is issued under the fixed designation F 269; 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 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 the standard. The values given in parentheses are for
capable of rotating 90° on its axis in order that the test
information only.
specimen may be heated both in a vertical-position with its
1.3 This standard does not purport to address all of the
apex down and in a horizontal position. A means shall be
safety concerns, if any, associated with its use. It is the
provided for accomplishing this rotation without requiring the
responsibility of the user of this standard to consult and
removal of the test specimen from the clamping fixture.
establish appropriate safety and health practices and deter-
2.3 Weights—A set of weights comprising loads of 3, 4, 6,
mine the applicability of regulatory limitations prior to use.
7, 9, 10, and 13 lb (1.4, 1.8, 2.7, 3.2, 4.1, 4.5, and 5.9 kg). A
2. Apparatus hook shall be provided for attaching the required weight to the
apex of the test specimen. This hook should be made from
2.1 BellJarEnvelope—Asuitableenvelopesurroundingthe
tungsten wire and should be capable of supporting the heaviest
test apparatus. The envelope may consist of a glass bell jar,
weight at the elevated temperature of testing, without fear of
preferably of a heat resistant glass (Warning —A protective
breaking.
medium shall be provided over an exposed glass to prevent
injury by flying glass in the event of an explosion), or may be
NOTE 1—Atungsten wire with a diameter of 0.080 in. is recommended
constructed of metal, in which case a transparent window shall
for use as a hook.
be provided in order that the behavior of the specimen under
2.4 Cathetometer or any other suitable instrument for mea-
test may be observed. The envelope may be rigidly supported
surement of the vertical displacement of the test specimen that
in a fixed position or may by suspended in such a manner that
results from the sag test. This instrument shall have a suitable
itcanberaisedorloweredintopositionoverthetestapparatus.
scale so that movement of the specimen of as little as 0.5 mm
Ameansshallbeprovidedformaintainingwithintheenvelope
may be read.
an atmosphere and steady supply flow of hydrogen. A flow
2.5 Power Supply—Asupply of electric current sufficient to
meter shall be incorporated in the hydrogen line so that
heat the test specimen to the required test temperatures. A
measurement and control of the gas flow may be maintained.
meter shall be provided in this supply to permit measurement
The hydrogen line shall discharge at the upper levels of the
of the current to an accuracy of 62%.
envelope and shall be baffled by a suitable diffusing device so
that no direct stream of the gas will play upon the test
3. Materials
specimens.
3.1 Hydrogen used for the test atmosphere shall have a
2.2 Specimen Support—A suitably designed support and
purity meeting the following requirements:
clamping device for holding the specimen within the envelope 3
3.1.1 Moisture (water), not more than 2.5 g/1000 ft (2.5
during testing. This support, which may be rigidly fixed or
g/28 m ) as indicated by a dew point of−65°C or below.
3.1.2 Oxygen, not more than 10 ppm.
3.1.3 Hydrocarbons (plus CO and CO ), not more than 20
This test method is under the jurisdiction of ASTM Committee F01 on 2
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic ppm.
Materials. 1
3.1.4 Nitrogen, not more than ⁄2%.
Current edition approved Sept. 19, 1960. Originally published as B269– 52 T;
redesignated F269 in 1955. Last previous edition F269 – 58 T.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 269
4. Test Specimen constant rate of 2600 K true temperature in 1 min and hold at
that temperature for 5 min, after which lower the current to
4.1 Surface—Thespecimenoftungstenwi
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.