ASTM F269-60(2019)
(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 establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 31-Mar-2019
- Technical Committee
- F01 - Electronics
- Drafting Committee
- F01.03 - Metallic Materials, Wire Bonding, and Flip Chip
Relations
- Effective Date
- 01-Apr-2019
- Referred By
ASTM F288-96(2019) - Standard Specification for Tungsten Wire for Electron Devices and Lamps - Effective Date
- 01-Apr-2019
Overview
ASTM F269-60(2019), titled Standard Test Method for Sag of Tungsten Wire, provides a recognized procedure for determining the sag properties of tungsten wire with a diameter of 0.030 inches (0.76 mm) and greater. Developed by ASTM International, this standard sets forth uniform methods ensuring valid, repeatable testing across manufacturers and industries. Tungsten wire, known for its strength and high-temperature resilience, is widely used in electronics, lighting, and materials engineering. Reliable sag testing is essential for applications requiring precise dimensional stability during thermal processing or under load.
Key Topics
- Test Applicability: Covers tungsten wire with diameters from 0.030 in. (0.76 mm) upwards.
- Testing Environment: Testing is conducted in a controlled hydrogen atmosphere to prevent oxidation and maintain material integrity.
- Specimen Preparation:
- Tungsten wire samples must have a clean, bright surface and a minimum length as specified.
- Formed into a hairpin shape using external heat, ensuring the legs are coplanar and the distance between ends meets defined criteria.
- Procedural Steps:
- Mounting the wire in a bell jar envelope.
- Attaching precise weights (ranging from 3 to 13 lb, depending on wire diameter).
- Heating to 2600 K at a constant rate, then holding for a specified duration.
- Measuring sag as the change in vertical displacement of the wire’s apex.
- Measurement Tools: Use of cathetometer or equivalent devices capable of precise displacement readings.
- Reporting Requirements: Documentation includes wire manufacturer, type, lot and ingot numbers, wire size, and measured sag values.
Applications
ASTM F269-60(2019) is critical for industries relying on tungsten wire in high-performance or thermally demanding environments. Typical applications include:
- Electronics Manufacturing: Quality control of tungsten wire used in filament production, support structures, and wire bonding applications.
- Lighting Industry: Ensuring stability and performance consistency of tungsten filaments in lamps and specialized lighting devices.
- Materials Engineering: Evaluating the creep and deformation behavior of tungsten under high temperatures for research and product development.
- Aerospace and Scientific Equipment: Certification and quality assurance of tungsten components exposed to thermal cycling and stress.
By standardizing test conditions and reporting, ASTM F269-60(2019) supports comparability and reliability of tungsten wire sag data, which informs engineering design, supplier validation, and regulatory compliance.
Related Standards
Consider referencing these international and ASTM standards for complementary or extended testing:
- ASTM E145 - Standard Specification for Gravity-Convection and Forced-Ventilation Ovens
- ASTM B777 - Standard Specification for Tungsten Heavy Alloys
- ASTM F132 - Standard Test Method for Shear Strength of Bonds of Electronic Elements by Wire Bond Pull Test
- ISO 9001 - Quality Management Systems (for general quality assurance practices)
- ISO 6892 - Metallic Materials - Tensile Testing
These related standards may address other physical properties, general materials testing, or provide context for quality management systems involving tungsten wire and related components.
Keywords: ASTM F269-60, tungsten wire, sag test, creep testing, hydrogen atmosphere, high temperature, wire deformation, materials testing, electronic components, lighting industry, quality assurance.
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Frequently Asked Questions
ASTM F269-60(2019) is a standard published by ASTM International. Its full title is "Standard Test Method for Sag of Tungsten Wire". This standard covers: 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 establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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 establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM F269-60(2019) is classified under the following ICS (International Classification for Standards) categories: 29.060.10 - Wires. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM F269-60(2019) has the following relationships with other standards: It is inter standard links to ASTM F269-60(2014), ASTM F288-96(2019). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM F269-60(2019) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F269 − 60 (Reapproved 2019)
Standard Test Method for
Sag of Tungsten Wire
ThisstandardisissuedunderthefixeddesignationF269;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope envelope and shall be baffled by a suitable diffusing device so
that no direct stream of the gas will play upon the test
1.1 This test method covers a determination of the sag
specimens.
properties of tungsten wire 0.030 in. (0.76 mm) and over in
diameter.
2.2 Specimen Support—A suitably designed support and
clamping device for holding the specimen within the envelope
1.2 The values stated in inch-pound units are to be regarded
during testing. This support, which may be rigidly fixed or
as standard. The values given in parentheses are mathematical
capable of being raised into or lowered from the envelope,
conversions to SI units that are provided for information only
shall be made from a suitable metallic conductor so that
and are not considered standard.
electrical current from the power supply may be used to heat
1.3 This standard does not purport to address all of the
the test specimen. An insulated clamping fixture shall be
safety concerns, if any, associated with its use. It is the
provided at the top of the support so that the hairpin test
responsibility of the user of this standard to establish appro-
specimen will be firmly held. This clamping device shall be
priate safety, health, and environmental practices and deter-
capable of rotating 90° on its axis in order that the test
mine the applicability of regulatory limitations prior to use.
specimen may be heated both in a vertical-position with its
1.4 This international standard was developed in accor-
apex down and in a horizontal position. A means shall be
dance with internationally recognized principles on standard-
provided for accomplishing this rotation without requiring the
ization established in the Decision on Principles for the
removal of the test specimen from the clamping fixture.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
2.3 Weights—Asetofweightscomprisingloadsof3,4,6,7,
Barriers to Trade (TBT) Committee. 9,10,and13lb(1.4,1.8,2.7,3.2,4.1,4.5,and5.9kg).Ahook
shall be provided for attaching the required weight to the apex
2. Apparatus
of the test specimen. This hook should be made from tungsten
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,
preferably of a heat resistant glass (Warning—A protective
NOTE 1—Atungsten wire with a diameter of 0.080 in. is recommended
medium shall be provided over an exposed glass to prevent
for use as a hook.
injury by flying glass in the event of an explosion), or may be
2.4 Cathetometer or any other suitable instrument for mea-
constructed of metal, in which case a transparent window shall
surement of the vertical displacement of the test specimen that
be provided in order that the behavior of the specimen under
results from the sag test. This instrument shall have a suitable
test may be observed. The envelope may be rigidly supported
scale so that movement of the specimen of as little as 0.5 mm
in a fixed position or may by suspended in such a manner that
may be read.
itcanberaisedorloweredintopositionoverthetestapparatus.
Ameansshallbeprovidedformaintainingwithintheenvelope
2.5 Power Supply—Asupply of electric current sufficient to
an atmosphere and steady supply flow of hydrogen. A flow
heat the test specimen to the required test temperatures. A
meter shall be incorporated in the hydrogen line so that
meter shall be provided in this supply to permit measurement
measurement and control of the gas flow may be maintained.
of the current to an accuracy of 62%.
The hydrogen line shall discharge at the upper levels of the
3. Materials
3.1 Hydrogen used for the test atmosphere shall have a
This test method is under the jurisdiction of ASTM Committee F01 on
purity meeting the following requirements:
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials, Wire Bonding, and Flip Chip.
3.1.1 Moisture (water), not more than 2.5 g/1000 ft (2.5
Current edition approved April 1, 2019. Published April 2019. Originally 3
g/28 m ) as indicated by a dew point of−65°C or below.
approved in 1952. Last previous edition approved in 2014 as F269 – 60 (2014).
DOI: 10.1520/F0269-60R19. 3.1.2 Oxygen, not more than 10 ppm.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F269 − 60 (2019)
3.1.3 Hydrocarbons ( plus CO and CO ), not more than 20 5.2 After t
...
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