ASTM F289-96(2009)
(Specification)Standard Specification for Molybdenum Wire and Rod for Electronic Applications
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
D
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 standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:F289 −96(Reapproved 2009)
Standard Specification for
Molybdenum Wire and Rod for Electronic Applications
ThisstandardisissuedunderthefixeddesignationF289;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E315Test Methods for Chemical Analysis of Molybdenum
(Withdrawn 2010)
1.1 This specification covers two grades of molybdenum
F16Test Methods for Measuring Diameter or Thickness of
wire less than 0.050 in. (1.27 mm) in diameter and one grade
Wire and Ribbon for Electronic Devices and Lamps
of molybdenum rod 1.00 in. (25.4 mm) or less in diameter as
F205Test Method for Measuring Diameter of Fine Wire by
follows:
Weighing
1.1.1 Grade 1—Commercially pure molybdenum wire suit-
F219Test Methods of Testing Fine Round and Flat Wire for
able for leads, hooks, supports, heaters, and metal-to-glass
Electron Devices and Lamps
seals.
2.2 Federal Standard:
1.1.2 Grade 2—Commercially pure molybdenum wire suit-
Fed. Std. No. 123Marking for Shipment (Civil Agencies)
able for mandrel either black or cleaned.
2.3 Military Standard:
1.1.3 Grade 3—Commercially pure molybdenum rod suit-
MIL-STD-129Marking for Shipment and Storage (Military
able for leads, hooks, supports, and metal-to-glass seals.
Agencies)
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
3. Chemical Composition
lengths 0.020 in. (0.51 mm) or less in diameter.
3.1 All grades of wire and rod shall be 99.90% minimum
1.3 The term rod applies to all material over 0.020 in. (0.51
pure molybdenum. The maximum allowable oxygen content
mm) in diameter, supplied in straight lengths.
shall be 0.007 weight% , while the maximum carbon content
shall be 0.03 weight %.
1.4 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
4. Mechanical Properties
conversions to SI units that are provided for information only
4.1 Tensile Properties:
and are not considered standard.
4.1.1 The tension test specimens and procedures shall con-
1.5 This standard does not purport to address all of the
form to Methods F219 for wire diameter up to and including
safety concerns, if any, associated with its use. It is the
0.010 in. (0.25 mm), and Test Methods E8 for all other wire
responsibility of the user of this standard to establish appro-
and rod diameters.
priate safety and health practices and determine the applica-
4.1.2 The tensile requirements of wire in sizes up to and
bility of regulatory limitations prior to use.
including 0.020 in. (0.51 mm) in diameter shall conform to the
requirements of Table 1 and shall be calculated by dividing the
2. Referenced Documents
breaking load in grams-force by the size of the wire expressed
2.1 ASTM Standards:
in milligrams per 200 mm.
D374Test Methods for Thickness of Solid Electrical Insu-
4.1.3 Thetensilerequirementsofwireinsizesover0.020in.
lation
(0.51 mm) up to 0.050 in. (1.3 mm) in diameter shall conform
E8Test Methods for Tension Testing of Metallic Materials
to the requirements of Table 2.
4.1.4 The tensile requirements of rod shall be as agreed
upon between the purchaser and the supplier.
This specification is under the jurisdiction of ASTM Committee F01 on
4.2 Ductility Properties:
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
4.2.1 Wire up to 0.003 in. (0.08 mm) in diameter shall not
Materials.
break when subjected to the test prescribed in 11.4.1.
CurrenteditionapprovedMay1,2009.PublishedJuly2009.Originallyapproved
in 1954. Last previous edition approved in 2002 as F289 – 96 (2002). DOI:
10.1520/F0289-96R09.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.astm.org.
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. 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
F289−96 (2009)
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 × 10 weight in mg/200 mm.
œ
TABLE 2 Tensile Requirement
6.4 When centerless ground rod is specified, the diameter
Minimum Tensile Elongation in 10 in. shall meet the tolerances shown in Table 3.
Wire Diameter, in. Strength, psi (250 mm), %
(mm) (MPa) Class Class
7. General Requirements
1, min 2, max
Over 0.020 (0.51) 64 000 (441) 6 6
7.1 The material shall be uniform in composition, cross
to 0.050 (1.27)
section, and in structural condition.
7.2 Unless otherwise specified, all material shall be pro-
vided in the stress-relief annealed condition (not recrystal-
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 lized).
observation through a binocular microscope at 30× when
8. Straightness
subjected to the test prescribed in 11.4.2.
4.2.3 Wire over 0.020 in. (0.51 mm) in diameter shall not 8.1 When ordered as straightened, straightness of wire shall
break or show cracks under unaided visual observation when
be specified as the radius of curvature or camber of a given
subjected to the test prescribed in 11.4.3. length of wire as agreed upon between the purchaser and the
4.2.4 Rod shall have ductility properties as agreed upon
supplier.
between the purchaser and the supplier.
8.2 Rod and short cut lengths shall be straight to within ⁄8
in. camber in 1 ft (or 3 mm camber in 300 mm) of length.
5. Surface Finish
NOTE 1—The straightness criterion in terms of maximum permissible
5.1 Molybdenum wire shall be furnished in the following
camberinanarbitrarylength,L`,iscalculatedastheproductoftheknown
finishes:
maximum permissible camber in a specified length, L, and the square of
5.1.1 As drawn, black, or
the ratio of L` to L.As an example, consider L` to be 3 ft. In inch-pound
5.1.2 As drawn, cleaned. 1 3 1
units, the maximum camber per 3-ft length=( ⁄8 in.) ( ⁄1) =1 ⁄8 in. In SI
units, the maximum camber per 760-mm length = (3 mm) ( ⁄300) =28
5.2 Molybdenum rod shall be furnished in the following
mm.Therelationgivenconstitutesanapproximationvalidforthepurpose
finishes:
as long as L` is not too large; the exact solution can be obtained by
5.2.1 Black,
considering a circle with the camber in length L` as one segment of a
diametral chord perpendicularly bisecting a chord of length L`.
5.2.2 Cleaned, or
5.2.3 Centerless ground.
9. Coiling and Spooling
5.3 Surfaces shall be smooth and free of contamination and
9.1 The spools or bands shall be clean and free of seams or
pernicious surface defects.
projections that might catch or tangle the wire during unwind-
ing. The wire shall be in one continuous length and wound
6. Dimensional Tolerances
smoothly in layers, with no piling upon turns, so that it
6.1 Forwireindiametersuptoandincluding0.020in.(0.51
unwinds freely without forming kinks. Inner and outer ends
mm)indiameterthetoleranceshallbe 65%ofweightper200
shallbefirmlyattachedtothespoolorbandbysuitablemeans.
mm. The
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