ASTM B663/B663M-20

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B663/B663M −20
Standard Specification for
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Silver-Tungsten Carbide Electrical Contact Material
This standard is issued under the fixed designation B663/B663M; 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 B328 Test Method for Density, Oil Content, and Intercon-
nected Porosity of Sintered Metal Structural Parts and
1.1 This specification covers electrical contact components
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Oil-Impregnated Bearings (Withdrawn 2009)
made from silver-tungsten carbide materials by powder metal-
lurgical processes.
3. Significance and Use
1.2 Thisspecificationcoverscompositionswithinthesilver-
3.1 This specification provides a means for the contact
tungsten carbide system normally specified by users of con-
manufacturer and contact user to establish agreement on the
tacts.
material to be supplied for a specific application including
NOTE 1—Table X1.1 and Table X1.2 in Appendix X1 provide a list of
microstructure and other properties.
typical compositions used for various applications.
3.2 As part of the qualification, it is recommended that the
1.3 The values stated in either SI units or inch-pound units
user functionally and electrically test the materials for all
are to be regarded separately as standard. The values stated in
devices applicable to the material’s use.
each system are not necessarily exact equivalents; therefore, to
ensure conformance with the standard, each system shall be
NOTE2—Theperformanceofcontactsinadevicedependsonnumerous
used independently of the other, and values from the two
factors outside the contact itself (opening speed, closing speed, contact
pressure, contact bounce, environmental variations, assembly technique
systems shall not be combined.
and variations, etc.). Proprietary methods for the manufacture of these
1.4 This standard does not purport to address all of the
materials vary significantly among suppliers, and these methods influence
safety concerns, if any, associated with its use. It is the
suchpropertiesasarcerosion,contactresistance,andthetendencytoweld
in service.
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate
4. Ordering Information
Safety Data Sheet (SDS) for this product/material as provided
by the manufacturer, to establish appropriate safety, health,
4.1 Orders for this material under this specification shall
and environmental practices, and determine the applicability include the following information:
of regulatory limitations prior to use.
4.1.1 Dimensions (see Section 9),
1.5 This international standard was developed in accor- 4.1.2 Chemicalcomposition(seeTableX1.1andTableX1.2
dance with internationally recognized principles on standard-
in Appendix X1 as a guideline),
ization established in the Decision on Principles for the 4.1.3 Physicalproperties(seeSection6andAppendixX1as
Development of International Standards, Guides and Recom-
a guideline),
mendations issued by the World Trade Organization Technical 4.1.4 Certification (see Section 12), and
Barriers to Trade (TBT) Committee.
4.1.5 Other features as agreed upon between the manufac-
turer and purchaser.
2. Referenced Documents
2 5. Chemical Composition
2.1 ASTM Standards:
5.1 The material shall conform to composition limits as
agreed upon between the manufacturer and the purchaser.
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This specification is under the jurisdiction of ASTM Committee B02 on
Typical chemical ranges are listed in Table X1.1 and Table
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
X1.2 of Appendix X1.
B02.05 on Precious Metals and Electrical Contact Materials.
Current edition approved Oct. 1, 2020. Published October 2020. Originally
5.2 The chemical analysis shall be made in accordance with
approved in 1979. Last previous edition approved in 2016 as B663/B663M – 16.
the methods prescribed inVolume 01.02 of the Annual Book of
DOI: 10.1520/B0663_B0663M-20.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
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