ASTM F289-96

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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 289 – 96
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 Specification for
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Molybdenum Wire and Rod for Electronic Applications
This standard is issued under the fixed designation F 289; 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.
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1. Scope Wire and Ribbon for Electronic Devices and Lamps
F 205 Test Method for Measuring Diameter of Fine Wire by
1.1 This specification covers two grades of molybdenum
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Weighing
wire less than 0.050 in. (1.27 mm) in diameter and one grade
F 219 Test Methods of Testing Fine Round and Flat Wire for
of molybdenum rod 1.00 in. (25.4 mm) or less in diameter as
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Electron Devices and Lamps
follows:
2.2 Federal Standard:
1.1.1 Grade 1—Commercially pure molybdenum wire suit-
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Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
able for leads, hooks, supports, heaters, and metal-to-glass
2.3 Military Standard:
seals.
MIL-STD-129 Marking for Shipment and Storage (Military
1.1.2 Grade 2—Commercially pure molybdenum wire suit- 6
Agencies)
able for mandrel either black or cleaned.
3. Chemical Composition
1.1.3 Grade 3—Commercially pure molybdenum rod suit-
able for leads, hooks, supports, and metal-to-glass seals. 3.1 All grades of wire and rod shall be 99.90 % minimum
pure molybdenum. The maximum allowable oxygen content
1.2 The term wire applies to all spooled or coiled material
shall be 0.007 weight% , while the maximum carbon content
and 0.050 in. (1.3 mm) or less in diameter and to short cut
shall be 0.03 weight %.
lengths 0.020 in. (0.51 mm) or less in diameter.
1.3 The term rod applies to all material over 0.020 in. (0.51
4. Mechanical Properties
mm) in diameter, supplied in straight lengths.
4.1 Tensile Properties:
1.4 The values stated in inch-pound units are to be regarded
4.1.1 The tension test specimens and procedures shall con-
as the standard. The metric equivalents of inch-pound units
form to Methods F 219 for wire diameter up to and including
may be approximate, except for the size of the wire expressed
0.010 in. (0.25 mm), and Test Methods E 8 for all other wire
in milligrams per 200 mm.
and rod diameters.
1.5 This standard does not purport to address all of the
4.1.2 The tensile requirements of wire in sizes up to and
safety concerns, if any, associated with its use. It is the
including 0.020 in. (0.51 mm) in diameter shall conform to the
responsibility of the user of this standard to establish appro-
requirements of Table 1 and shall be calculated by dividing the
priate safety and health practices and determine the applica-
breaking load in grams-force by the size of the wire expressed
bility of regulatory limitations prior to use.
in milligrams per 200 mm.
4.1.3 The tensile requirements of wire in sizes over 0.020 in.
2. Referenced Documents
(0.51 mm) up to 0.050 in. (1.3 mm) in diameter shall conform
to the requirements of Table 2.
2.1 ASTM Standards:
4.1.4 The tensile requirements of rod shall be as agreed
D 374 Test Methods for Thickness of Solid Electrical
2 upon between the purchaser and the supplier.
Insulation
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4.2 Ductility Properties:
E 8 Test Methods of Tension Testing of Metallic Materials
4.2.1 Wire up to 0.003 in. (0.08 mm) in diameter shall not
E 315 Test Methods for Chemical Analysis of Molybde-
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break when subjected to the test prescribed in 11.4.1.
num
4.2.2 Wire over 0.003 in. (0.08 mm) up to 0.020 in. (0.51
F 16 Test Methods for Measuring Diameter or Thickness of
mm) in diameter shall not break or show cracks under
observation through a binocular microscope at 303 when
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This specification is under the jurisdiction of ASTM Committee F-1 on
subjected to the test prescribed in 11.4.2.
Electronics, and is the direct responsibility of Subcommittee F01.03 on Metallic
4.2.3 Wire over 0.020 in. (0.51 mm) in diameter shall not
Materials.
break or show cracks under unaided visual observation when
Current edition approved June 10, 1996. Published August 1996. Originally
published as B 289 – 54 T; redesignated F 289 in 1956. Last previous edition
F 289 – 81 (1991).
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Annual Book of ASTM Standards, Vol 10.01. Annual Book of ASTM Standards, Vol 10.04.
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Annual Book of ASTM Standards, Vol 03.01. Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
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Annual Book of ASTM Standards, Vol 03.05. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
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F 289
TABLE 1 Tensile Requirements
Elongation in 10 in.
Wire Size, Minimum Tensile B
...