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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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D374 Test Methods for Thickness of Solid Electrical Insulation
E8 Test Methods for Tension Testing of Metallic Materials
E315 Test Methods for Chemical Analysis of Molybdenum
F16 Test Methods for Measuring Diameter or Thickness of Wire and Ribbon for Electronic Devices and Lamps
F205 Test Method for Measuring Diameter of Fine Wire by Weighing
F219 Test Methods of Testing Fine Round and Flat Wire for Electron Devices and Lamps
Federal StandardFed. Std. No. 123 Marking for Shipment (Civil Agencies) Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Military StandardMIL-STD-129 Marking for Shipment and Storage (Military Agencies)
ICS Number Code 29.060.10 (Wires)
UNSPSC Code 26121500(Electrical wire)
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ASTM F289-96(2014), Standard Specification for Molybdenum Wire and Rod for Electronic Applications, ASTM International, West Conshohocken, PA, 2014, www.astm.orgBack to Top