ASTM F288-96

Standard Specification for Tungsten Wire for Electron Devices and Lamps

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 1—ACommercially pure nonsag wire (Note 2 and Note 3).
1.1.2 Type 1—BCommercially pure rod suitable for metal-to-glass sealing.
1.1.3 Type 2—AThoriated filament wire containing 1 % thoria.
1.1.4 Type 2BThoriated filament wire containing 2 % thoria.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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 F 269.
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 F 269.

General Information

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

Relations

• Replaced By: ASTM F288-96(2002) - Standard Specification for Tungsten Wire for Electron Devices and Lamps
• 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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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 288 – 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
1
Tungsten Wire for Electron Devices and Lamps
This standard is issued under the fixed designation F 288; 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.
This standard has been approved for use by agencies of the Department of Defense. Consult the DoD Index of Specifications and
Standards for the specific year of issue which has been adopted by the Department of Defense.
1. Scope F 16 Test Methods for Measuring Diameter or Thickness of
2
Wire and Ribbon for Electronic Devices and Lamps
1.1 This specification covers three types of drawn wire
F 204 Test Method for Surface Flaws in Tungsten Seal Rod
suitable for fabrication into parts for electron tubes, lamps, and
2
and Wire
other devices; and one type of rod for metal-to-glass sealing
F 205 Test Method for Measuring Diameter of Fine Wire by
(grid wire is excepted):
2
Weighing
1.1.1 Type 1A—Commercially pure nonsag wire (Note 2
F 219 Test Methods of Testing Fine Round and Flat Wire for
and Note 3).
2
Electron Devices and Lamps
1.1.2 Type 1B—Commercially pure rod suitable for
2
F 269 Test Method for Sag of Tungsten Wire
metal-to-glass sealing.
2.2 Military Standards:
1.1.3 Type 2A—Thoriated filament wire containing 1 %
MIL-STD-105 Sampling Procedures and Tables for Inspec-
thoria.
3
tion by Attributes
1.1.4 Type 2B—Thoriated filament wire containing 2 %
3
MIL-STD-129 Marking for Shipment and Storage
thoria.
1.2 The values stated in inch-pound units are to be regarded
3. Terminology
as the standard. The values given in parentheses are for
information only.
3.1 Definition of Terms Specific to This Standard:
1.3 Types 1A and 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—The term rod as used in this specification applies
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.
4. Ordering Information
NOTE 1—A dimensional measurement method for testing nonsag tung-
sten 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 F 269.
shall include the following information:
NOTE 2—Acceptance of nonsag wire characteristics for particular
4.1.1 Length in metres, or quantity of short cut lengths,
applications of size shall be by agreement between producer and consumer
4.1.2 Type and UNS No. (Section 1),
based on either a flashed microstructure as shown by photomicrographs,
4.1.3 Straightness (Section 10),
or on dimensional measurement limits determined in accordance with Test
Method F 269.
4.1.4 Finish (Section 8),
4.1.5 Weight or size (Section 7) and tolerance, and
2. Referenced Documents
4.1.6 Specification number.
2.1 ASTM Standards:
NOTE 3—A typical ordering description for straight chemically cleaned
wire is as follows: xxxx metres, tungsten wire, Type 1A UNS R07005,
straightened, Finish 2; 280.8 mg/200 mm (63 %), to ASTM F288 – XX.
1
This specification is under the jurisdiction of ASTM Committee F-1 on
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials.
2
Current edition approved June 10, 1996. Published August 1996. Originally Annual Book of ASTM Standards, Vol 10.04.
3
published as B 288 – 54 T; redesignated F 288 in 1955. Last previous edition Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
F 288 – 81 (1991). Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
1

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F 288
5. Chemical Composition 7.3.3 The weight of Type 2B wire (density 18.50), is as
follows:
5.1 The wire and rod shall conform to the chemical require-
2
ments specified in Table 1
...