ASTM F288-96(2014)

Standard Specification for Tungsten Wire for Electron Devices and Lamps

ABSTRACT
This specification covers three types of drawn pure and thoriated tungsten wire suitable for fabrication into parts for electron tubes, lamps, and other electron devices, and one type of rod for metal-to-glass sealing (grid wire is excepted): Type 1A, Type 1B, Type 2A, and Type 2B. Types 1A and 1B are designated as UNS R07005; Type 2A is designated as UNS R07911; and Type 2B is designated as UNS R07912. The wire and rod shall conform to the prescribed chemical requirements for thoria and tungsten and to the specified physical properties such as tensile strength, ductility, and surface defects. The weight/diameter conversion formulas are given. Wires shall be furnished in the following specified finishes: Finish 1, Finish 2, Finish 3, Finish 4, Finish 5, Finish 6, and Finish 7. The material shall be smooth, free of twists, bends, kinks, curls, and as free of dents, swaging marks, scratches, die marks, laps, seams, splits, slivers, inclusions, bumps, pits, grooves, cracks, and other physical defects Unless black finish is specified, all types of wire shall have a clean finish, free of graphite, grease, oil, and lubricants. Wire for hooks, supports, springs, anchors, and mesh shall have a bright smooth surface free of cracks holes, or craters. The requirements for straightness, and coiling and spooling are detailed as well. The following analysis and tests shall be performed: chemical analysis, tensile test, ductility test, visual inspection, dimensional measurements, and examination for surface flaws.
SCOPE
1.1 This specification covers three types of drawn wire suitable for fabrication into parts for electron tubes, lamps, and other devices; and one type of rod for metal-to-glass sealing (grid wire is excepted):  
1.1.1 Type 1A—Commercially pure nonsag wire (Note 2 and Note 3).  
1.1.2 Type 1B—Commercially pure rod suitable for metal-to-glass sealing.  
1.1.3 Type 2A—Thoriated filament wire containing 1 % thoria.  
1.1.4 Type 2B—Thoriated filament wire containing 2 % thoria.  
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 Types 1A and 1B are designated as UNS R07005. Type 2A is designated as UNS R07911. Type 2B is designated as UNS R07912.  
1.4 The following precautionary caveat pertains only to the Chemical Analysis, Section 12 of this specification: 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.  
Note 1: A dimensional measurement method for testing nonsag tungsten wire above 0.030 in. (0.76 mm) in diameter is provided in Test Method F269.
Note 2: Acceptance of nonsag wire characteristics for particular applications of size shall be by agreement between producer and consumer based on either a flashed microstructure as shown by photomicrographs, or on dimensional measurement limits determined in accordance with Test Method F269.

General Information

• Status: Historical
• Publication Date: 31-May-2014
• ICS: 29.060.10 - Wires
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaces: ASTM F288-96(2009) - Standard Specification for Tungsten Wire for Electron Devices and Lamps
• Effective Date: 01-Jun-2014
• Replaced By: ASTM F288-96(2019) - Standard Specification for Tungsten Wire for Electron Devices and Lamps
• Effective Date: 01-Apr-2019
• Referred By: ASTM F290-94(2020) - Standard Specification for Round Wire for Winding Electron Tube Grid Laterals
• Effective Date: 01-Jun-2014

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:F288 −96 (Reapproved 2014)
Standard Specification for
1
Tungsten Wire for Electron Devices and Lamps
ThisstandardisissuedunderthefixeddesignationF288;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This specification covers three types of drawn wire
suitableforfabricationintopartsforelectrontubes,lamps,and F16Test Methods for Measuring Diameter or Thickness of
Wire and Ribbon for Electronic Devices and Lamps
other devices; and one type of rod for metal-to-glass sealing
(grid wire is excepted): F204Test Method for Surface Flaws in Tungsten Seal Rod
and Wire
1.1.1 Type 1A—Commerciallypurenonsagwire(Note2and
Note 3). F205Test Method for Measuring Diameter of Fine Wire by
Weighing
1.1.2 Type 1B—Commercially pure rod suitable for metal-
to-glass sealing. F219Test Methods ofTesting Fine Round and FlatWire for
Electron Devices and Lamps
1.1.3 Type 2A—Thoriated filament wire containing 1%
thoria. F269Test Method for Sag of Tungsten Wire
1.1.4 Type 2B—Thoriated filament wire containing 2%
2.2 Military Standards:
thoria.
MIL-STD-105Sampling Procedures and Tables for Inspec-
3
tion by Attributes
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
3
MIL-STD-129Marking for Shipment and Storage
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3. Terminology
and are not considered standard.
3.1 Definition of Terms Specific to This Standard:
1.3 Types 1Aand 1B are designated as UNS R07005. Type
3.1.1 wire—The term wire as used in this specification
2A is designated as UNS R07911. Type 2B is designated as
applies to all drawn material that is spooled or coiled, and to
UNS R07912.
short cut lengths 0.020 in. (0.51 mm) or less in diameter.
1.4 The following precautionary caveat pertains only to the
3.1.2 nonsag or doped tungsten wire—This term designates
Chemical Analysis, Section 12 of this specification: This
a wire which, when recrystallized, shows elongated interlock-
standard does not purport to address all of the safety concerns,
ing grains.
if any, associated with its use. It is the responsibility of the user
3.1.3 rod—Thetermrodasusedinthisspecificationapplies
of this standard to establish appropriate safety and health
to centerless ground material 0.020 in. (0.51 mm) or larger in
practices and determine the applicability of regulatory limita-
diameter, in short cut lengths or random cut lengths.
tions prior to use.
NOTE 1—A dimensional measurement method for testing nonsag
4. Ordering Information
tungsten wire above 0.030 in. (0.76 mm) in diameter is provided in Test
4.1 Orders for wire and rod furnished to this specification
Method F269.
shall include the following information:
NOTE 2—Acceptance of nonsag wire characteristics for particular
applicationsofsizeshallbebyagreementbetweenproducerandconsumer
4.1.1 Length in metres, or quantity of short cut lengths,
based on either a flashed microstructure as shown by photomicrographs,
4.1.2 Type and UNS No. (Section 1),
orondimensionalmeasurementlimitsdeterminedinaccordancewithTest
4.1.3 Straightness (Section 10),
Method F269.
4.1.4 Finish (Section 8),
1 2
This specification is under the jurisdiction of ASTM Committee F01 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Materials. Standards volume information, refer to the standard’s Document Summary page on
CurrenteditionapprovedJune1,2014.PublishedJuly2014.Originallyapproved the ASTM website.
3
in 1954. Last previous edition approved in 2009 as F288 – 96 (2009). DOI: AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
10.1520/F0288-96R14. 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
1

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F288−96 (2014)
4.1.5 Weight or size (Section 7) and tolerance, and 7.3.1 TheweightofType1AwireandType1Brod(density
4.1.6 Specification number. 19.17), is as follows:
2
wt inmg/200mm 5 diameterinmils 31.943, or
NOTE 3—Atypical ordering description for straight chemically cleaned ~ !
2
wire is as follows: xxxx metres, tungsten wire, Type 1A UNS R07005, ~diameterinmm! 33011
straightened, Finish 2; 280.8 mg/200 mm (63%), toASTM F288–XX.
7.3.2 The weight of Type 2A wire (density
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F288 − 96 (Reapproved 2009) F288 − 96 (Reapproved 2014)
Standard Specification for
1
Tungsten Wire for Electron Devices and Lamps
This standard is issued under the fixed designation F288; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This specification covers three types of drawn wire suitable for fabrication into parts for electron tubes, lamps, and other
devices; and one type of rod for metal-to-glass sealing (grid wire is excepted):
1.1.1 Type 1A—Commercially pure nonsag wire (Note 2 and Note 3).
1.1.2 Type 1B—Commercially pure rod suitable for metal-to-glass sealing.
1.1.3 Type 2A—Thoriated filament wire containing 1 % thoria.
1.1.4 Type 2B—Thoriated filament wire containing 2 % thoria.
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 Types 1A and 1B are designated as UNS R07005. Type 2A is designated as UNS R07911. Type 2B is designated as UNS
R07912.
1.4 The following precautionary caveat pertains only to the Chemical Analysis, Section 12 of this specification: 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.
NOTE 1—A dimensional measurement method for testing nonsag tungsten wire above 0.030 in. (0.76 mm) in diameter is provided in Test Method F269.
NOTE 2—Acceptance of nonsag wire characteristics for particular applications of size shall be by agreement between producer and consumer based
on either a flashed microstructure as shown by photomicrographs, or on dimensional measurement limits determined in accordance with Test Method
F269.
2. Referenced Documents
2
2.1 ASTM Standards:
F16 Test Methods for Measuring Diameter or Thickness of Wire and Ribbon for Electronic Devices and Lamps
F204 Test Method for Surface Flaws in Tungsten Seal Rod and Wire
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
F269 Test Method for Sag of Tungsten Wire
2.2 Military Standards:
3
MIL-STD-105 Sampling Procedures and Tables for Inspection by Attributes
3
MIL-STD-129 Marking for Shipment and Storage
3. Terminology
3.1 Definition of Terms Specific to This Standard:
3.1.1 wire—The term wire as used in this specification applies to all drawn material that is spooled or coiled, and to short cut
lengths 0.020 in. (0.51 mm) or less in diameter.
3.1.2 nonsag or doped tungsten wire—This term designates a wire which, when recrystallized, shows elongated interlocking
grains.
1
This specification is under the jurisdiction of ASTM Committee F01 on Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic Materials.
Current edition approved May 1, 2009June 1, 2014. Published July 2009 July 2014. Originally approved in 1954. Last previous edition approved in 20022009 as F288
– 96 (2002).(2009). DOI: 10.1520/F0288-96R09.10.1520/F0288-96R14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 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
1

---------------------- Page: 1 ----------------------
F288 − 96 (2014)
3.1.3 rod—The term rod as used in this specification applies to centerless ground material 0.020 in. (0.51 mm) or larger in
diameter, in short cut lengths or random cut lengths.
4. Ordering Information
4.1 Orders for wire and rod furnished to this specification shall include the following information:
4.1.1 Length in metres, or quantity of short cut lengths,
4.1.2 Type and UNS No. (Section 1),
4.1.3 Straightness (Section 10),
4.1.4 F
...