ASTM F269-60(1996)e1

Standard Test Method for Sag of Tungsten Wire

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

• Status: Historical
• Publication Date: 18-Sep-1960
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaced By: ASTM F269-60(2002) - Standard Test Method for Sag of Tungsten Wire
• Effective Date: 19-Sep-1960

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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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.
e1
Designation: F 269 – 60 (Reapproved 1996)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Keywords were added editorially in June 1996.
1. Scope electrical current from the power supply may be used to heat
the test specimen. An insulated clamping fixture shall be
1.1 This test method covers a determination of the sag
provided at the top of the support so that the hairpin test
properties of tungsten wire 0.030 in. (0.76 mm) and over in
specimen will be firmly held. This clamping device shall be
diameter.
capable of rotating 90° on its axis in order that the test
1.2 The values stated in inch-pound units are to be regarded
specimen may be heated both in a vertical-position with its
as the standard. The values given in parentheses are for
apex down and in a horizontal position. A means shall be
information only.
provided for accomplishing this rotation without requiring the
1.3 This standard does not purport to address all of the
removal of the test specimen from the clamping fixture.
safety concerns, if any, associated with its use. It is the
2.3 Weights—A set of weights comprising loads of 3, 4, 6,
responsibility of the user of this standard to consult and
7, 9, 10, and 13 lb (1.4, 1.8, 2.7, 3.2, 4.1, 4.5, and 5.9 kg). A
establish appropriate safety and health practices and deter-
hook shall be provided for attaching the required weight to the
mine the applicability of regulatory limitations prior to use.
apex of the test specimen. This hook should be made from
2. Apparatus
tungsten wire and should be capable of supporting the heaviest
2.1 Bell Jar Envelope—A suitable envelope surrounding the
weight at the elevated temperature of testing, without fear of
test apparatus. The envelope may consist of a glass bell jar,
breaking.
preferably of a heat resistant glass (Precaution, see Note 1), or
NOTE 2—A tungsten wire with a diameter of 0.080 in. is recommended
may be constructed of metal, in which case a transparent
for use as a hook.
window shall be provided in order that the behavior of the
2.4 Cathetometer or any other suitable instrument for mea-
specimen under test may be observed. The envelope may be
surement of the vertical displacement of the test specimen that
rigidly supported in a fixed position or may by suspended in
results from the sag test. This instrument shall have a suitable
such a manner that it can be raised or lowered into position
scale so that movement of the specimen of as little as 0.5 mm
over the test apparatus. A means shall be provided for main-
may be read.
taining within the envelope an atmosphere and steady supply
2.5 Power Supply—A supply of electric current sufficient to
flow of hydrogen. A flow meter shall be incorporated in the
heat the test specimen to the required test temperatures. A
hydrogen line so that measurement and control of the gas flow
meter shall be provided in this supply to permit measurement
may be maintained. The hydrogen line shall discharge at the
of the current to an accuracy of 62%.
upper levels of the envelope and shall be baffled by a suitable
diffusing device so that no direct stream of the gas will play
3. Materials
upon the test specimens.
3.1 Hydrogen used for the test atmosphere shall have a
NOTE 1—Precaution: A protective medium shall be provided over an purity meeting the following requirements:
exposed glass to prevent injury by flying glass in the event of an
3.1.1 Moisture (water), not more than 2.5 g/1000 ft (2.5
explosion.
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.
capable of being raised into or lowered from the envelope,
3.1.4 Nitrogen, not more than ⁄2 %.
shall be made from a suitable metallic conductor so that
4. Test Specimen
4.1 Surface—The specimen of tungsten wire to be tested for
This test method is under the jurisdiction of ASTM Committee F-1 on
sag shall have a clean, bright surface and shall be at least 15 in.
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
in length.
Materials.
4.2
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