ASTM F289-96(2002)

Standard Specification for Molybdenum Wire and Rod for Electronic Applications

ABSTRACT
This specification deals with molybdenum wire and rod for electronic applications. The following grades of molybdenum wire and rod are covered in this specification: Grade 1—commercially pure molybdenum wire suitable for leads, hooks, supports, heaters, and metal-to-glass seals; Grade 2—commercially pure molybdenum wire suitable for mandrel either black or cleaned; and Grade 3—commercially pure molybdenum rod suitable for leads, hooks, supports, and metal-to-glass seals. Materials shall be tested and the individual grades shall conform to specified values of chemical composition, minimum tensile strength, elongation, ductility, surface finish, dimensional tolerances, and straightness.
SCOPE
1.1 This specification covers two grades of molybdenum wire less than 0.050 in. (1.27 mm) in diameter and one grade of molybdenum rod 1.00 in. (25.4 mm) or less in diameter as follows:
1.1.1 Grade 1—Commercially pure molybdenum wire suitable for leads, hooks, supports, heaters, and metal-to-glass seals.
1.1.2 Grade 2—Commercially pure molybdenum wire suitable for mandrel either black or cleaned.
1.1.3 Grade 3—Commercially pure molybdenum rod suitable for leads, hooks, supports, and metal-to-glass seals.
1.2 The term wire applies to all spooled or coiled material and 0.050 in. (1.3 mm) or less in diameter and to short cut 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 mm) in diameter, supplied in straight lengths.
1.4 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate, except for the size of the wire expressed in milligrams per 200 mm.
1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Jun-1996
• ICS: 29.060.10 - Wires
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaces: ASTM F289-96 - Standard Specification for Molybdenum Wire and Rod for Electronic Applications
• Effective Date: 10-Jun-1996
• Replaced By: ASTM F289-96(2009) - Standard Specification for Molybdenum Wire and Rod for Electronic Applications
• Effective Date: 01-May-2009
• Referred By: ASTM F219-96(2018) - Standard Test Methods of Testing Fine Round and Flat Wire for Electron Devices and Lamps (Withdrawn 2023)
• Effective Date: 10-Jun-1996
• Referred By: ASTM B387/B387M-23 - Standard Specification for Molybdenum and Molybdenum Alloy Bar, Rod, and Wire
• Effective Date: 10-Jun-1996
• Referred By: ASTM F290-94(2020) - Standard Specification for Round Wire for Winding Electron Tube Grid Laterals
• Effective Date: 10-Jun-1996

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 289 – 96 (Reapproved 2002)
Standard Specification for
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.
1. Scope Wire and Ribbon for Electronic Devices and Lamps
F 205 Test Method for Measuring Diameter of FineWire by
1.1 This specification covers two grades of molybdenum
Weighing
wire less than 0.050 in. (1.27 mm) in diameter and one grade
F219 TestMethodsofTestingFineRoundandFlatWirefor
of molybdenum rod 1.00 in. (25.4 mm) or less in diameter as
Electron Devices and Lamps
follows:
2.2 Federal Standard:
1.1.1 Grade 1—Commercially pure molybdenum wire suit-
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-
Agencies)
able for mandrel either black or cleaned.
1.1.3 Grade 3—Commercially pure molybdenum rod suit-
3. Chemical Composition
able for leads, hooks, supports, and metal-to-glass seals.
3.1 All grades of wire and rod shall be 99.90 % minimum
1.2 The term wire applies to all spooled or coiled material
pure molybdenum. The maximum allowable oxygen content
and 0.050 in. (1.3 mm) or less in diameter and to short cut
shall be 0.007 weight% , while the maximum carbon content
lengths 0.020 in. (0.51 mm) or less in diameter.
shall be 0.03 weight %.
1.3 The term rod applies to all material over 0.020 in. (0.51
mm) in diameter, supplied in straight lengths.
4. Mechanical Properties
1.4 The values stated in inch-pound units are to be regarded
4.1 Tensile Properties:
as the standard. The metric equivalents of inch-pound units
4.1.1 The tension test specimens and procedures shall con-
may be approximate, except for the size of the wire expressed
form to Methods F 219 for wire diameter up to and including
in milligrams per 200 mm.
0.010 in. (0.25 mm), and Test Methods E 8 for all other wire
1.5 This standard does not purport to address all of the
and rod diameters.
safety concerns, if any, associated with its use. It is the
4.1.2 The tensile requirements of wire in sizes up to and
responsibility of the user of this standard to establish appro-
including 0.020 in. (0.51 mm) in diameter shall conform to the
priate safety and health practices and determine the applica-
requirements of Table 1 and shall be calculated by dividing the
bility of regulatory limitations prior to use.
breaking load in grams-force by the size of the wire expressed
2. Referenced Documents in milligrams per 200 mm.
4.1.3 Thetensilerequirementsofwireinsizesover0.020in.
2.1 ASTM Standards:
(0.51 mm) up to 0.050 in. (1.3 mm) in diameter shall conform
D 374 Test Methods for Thickness of Solid Electrical
2 to the requirements of Table 2.
Insulation
3 4.1.4 The tensile requirements of rod shall be as agreed
E 8 Test Methods ofTensionTesting of Metallic Materials
upon between the purchaser and the supplier.
E 315 Test Methods for Chemical Analysis of Molybde-
4 4.2 Ductility Properties:
num
4.2.1 Wire up to 0.003 in. (0.08 mm) in diameter shall not
F 16 Test Methods for Measuring Diameter or Thickness of
break when subjected to the test prescribed in 11.4.1.
4.2.2 Wire over 0.003 in. (0.08 mm) up to 0.020 in. (0.51
mm) in diameter shall not break or show cracks under
This specification is under the jurisdiction of ASTM Committee F01 on
observation through a binocular microscope at 303 when
Electronics, and is the direct responsibility of Subcommittee F01.03 on Metallic
subjected to the test prescribed in 11.4.2.
Materials.
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).
2 5
Annual Book of ASTM Standards, Vol 10.01. Annual Book of ASTM Standards, Vol 10.04.
3 6
Annual Book of ASTM Standards, Vol 03.01. Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Annual Book of ASTM Standards, Vol 03.05. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F 289
TABLE 1 Tensile Requirements
Elongation in 10 in.
Wire Size, Minimum Tensile Breaking Load,
A (250 mm), %
Maximum Diameter, in. (mm)
mg/200 mm gf/(mg/200 mm)
Grade 1 Grade 2
Up to 4.11, incl 0.0020 (0.051) 50 >6 #6
Over 4.11 to 6.42, incl 0.0025 (0.064) 46 >6 #6
Over 6.42 to 10.53, incl 0.0032 (0.081) 44 >6 #6
Over 10.53 to 411.2, incl 0.020 (0.51) 40 >6 #6
A −4
Wire diameter, in. = 9.86 3 10 =weight in mg/200 mm.
TABLE 2 Tensile Requirement TABLE 3 Centerless-Ground Rod Diameter Tolerances
Minimum Tensile Elongation in 10 in. Permissible Variation in
Wire Diameter, in. Strength, psi (250 mm), % Specified Diameter, in. (mm) Diameter, plus or minus, in.
(mm) (MPa) Class Class (mm)
1, min 2, max
Over 0.020 (0.51) to 0.060 (1.53), incl 0.001 (0.025)
Over 0.020 (0.51) 64 000 (441) 6 6
Over 0.060 (1.54) to 0.500 (12.70), incl 0.002 (0.050)
to 0.050 (1.27)
Over 0.500 (12.71) to 1.00 in. (25.4), incl 0.003 (0.075)
4.2.3 Wire over 0.020 in. (0.51 mm) in diameter shall not
7.2 Unless otherwise specified, all material shall be pro-
break or show cracks under unaided visual observation when
vided in the stress-relief annealed condition (not recrystal-
subjected to the test prescribed in 11.4.3.
lized).
4.2.4 Rod shall have ductility properties as agreed upon
8. Straightness
between the purchaser and the supplier.
8.1 When ordered as straightened, straightness of wire shall
5. Surface Finish
be specified as the radius of curvature or camber of a given
length of wire as agreed upon between the purchaser and the
5.1 Molybdenum wire shall be furnished in the following
supplier.
finishes:
8.2 Rod and short cut lengths shall be straight to within ⁄8
5.1.1 As drawn, black, or
in. camber in 1 ft (or 3 mm camber in 300 mm) of length.
5.1.2 As drawn, cleaned.
5.2 Molybdenum rod shall be furnished in the following
NOTE 1—The straightness criterion in terms of maximum permissible
finishes:
camber in an arbitrary length,L8, is calculated as the product of the known
5.2.1 Black,
maximum permissible camber in a specified length, L, and the square of
5.2.2 Cleaned, or the ratio of L8 to L. As an example, consider L8 to be 3 ft. In inch-pound
1 3 1
units, the maximum camber per 3-ft length = ( ⁄8 in.) ( ⁄1) =1 ⁄8 in. In SI
5.2.3 Centerless ground.
units, the maximum camber per 760-mm length = (3 mm) ( ⁄300) =28
5.3 Surfaces shall be smooth and free of contamination and
mm.The relation given constitutes an approximation valid for the purpose
pernicious surface defects.
as long as L8 is not too large; the exact solution can be obtained by
considering a circle with the camber in length L8 as one segment of a
6. Dimensional Tolerances
diametral chord perpendicularly bisecting a chord of length L8.
6.1 Forwireindiametersuptoandincluding0.020in.(0.51
9. Coiling and Spooling
mm) in diameter the tolerance shall be 65 % of weight per 200
mm. The size of wire shall be uniform for Grades 1 and 3
9.1 The spools or bands shall be clean and free of seams or
within 2 weight % as measured at both ends of the wire; and
projections that might catch or tangle the wire during unwind-
for Grade 2 within 1 weight % within the total length of the
ing.
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