ASTM B693-91(2001)
(Specification)Standard Specification for Silver-Nickel Electrical Contact Materials
Standard Specification for Silver-Nickel Electrical Contact Materials
SCOPE
1.1 This specification covers electrical contact components made from silver nickel by powder metallurgical procedures.
1.2 This specification covers compositions within the silver-nickel system normally specified by users of electrical contacts.
1.3 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.
1.4 It is the responsibility of the user to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet for this product/material as provided by the manufacturer.
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Standards Content (Sample)
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Designation: B 693 – 91 (Reapproved 2001)
Standard Specification for
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Silver-Nickel Electrical Contact Materials
This standard is issued under the fixed designation B 693; 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.
1. Scope 4. Chemical Composition
1.1 This specification covers electrical contact components 4.1 The material shall conform to composition limits as
made from silver nickel by powder metallurgical procedures. agreed upon between the manufacturer and user.
1.2 This specification covers compositions within the silver- 4.2 The chemical analysis shall be made in accordance with
nickel system normally specified by users of electrical con- the methods described in the newest edition of Annual Book of
tacts. ASTM Standards, Vol 03.05 and 03.06, or by any other
1.3 This standard does not purport to address all of the approved method agreed upon between manufacturer and
safety concerns, if any, associated with its use. It is the purchaser.
responsibility of the user of this standard to establish appro-
5. Physical Requirements
priate safety and health practices and determine the applica-
5.1 The manufacturer and purchaser shall agree on qualifi-
bility of regulatory limitations prior to use.
1.4 It is the responsibility of the user to become familiar cation tests for determination of physical properties.
5.2 The tests shall be performed on production parts,
with all hazards including those identified in the appropriate
Material Safety Data Sheet for this product/material as pro- wherever practical, or applicable. (Small size contacts do not
lend themselves to accurate conductivity measurement.)
vided by the manufacturer.
5.3 The tests shall be determined after consideration of the
2. Referenced Documents
function of the part.
2.1 ASTM Standards: 5.4 The typical properties of the most common types of
B 328 Test Method for Density, Oil Content, and Intercon- silver-nickel electrical contact materials are given in the
nected Porosity of Sintered Metal Structural Parts and appendix.
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Oil-Impregnated Bearings
6. Dimensions, Mass, and Permissible Variations
E18 Test Methods for Rockwell Hardness and Rockwell
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Superficial Hardness of Metallic Materials 6.1 Permissible variations in dimensions shall be within the
limits specified on drawings describing the contacts and
E 384 Test Method for Microindentation Hardness of Ma-
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terials accompanying the order, or shall be within the limits specified
in the purchase order.
3. Ordering Information
7. Workmanship, Finish, and Appearance
3.1 Orders for this material under this specification shall
7.1 The parts shall be free of defects in material or process-
include the following information.
ing, which would seriously affect their performance.
3.1.1 Dimensions (see Section 6).
3.1.2 Chemical composition (see reference table in Appen-
8. Sampling
dix X1).
8.1 Lot—Unless otherwise specified, a lot shall consist of
3.1.3 Physical properties (see Section 5 and reference table
parts of the same form, and dimensions, made of powders of
in Appendix X1).
the same particle size range and composition, processed under
3.1.4 Certification (see Section 13).
the same conditions, and submitted for inspection at one time.
3.1.5 Other features as agreed upon between the seller and
the user.
9. Number of Tests and Retests
9.1 Chemical Analysis—The manufacturer and purchaser
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This specification is under the jurisdiction of ASTM Committee B02 on
shall agree on a representative number of specimens for
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
chemical analysis. A representative sample of chips may be
B2.05 on Precious Metals and Electrical Contact Materials.
obtained by milling, drilling, or crushing with dry tools,
Current edition approved Aug. 15, 1991. Published November 1991. Originally
published as B 693 – 81. Last previous edition B 693 – 87.
(without lubrication). In order to obtain free chips, the parts
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Annual Book of ASTM Standards, Vol 02.05.
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Annual Book of ASTM Standards, Vol 03.01.
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B 693 – 91 (2001)
selected for test shall have the oil extracted in accordance with 11. Inspection
Test Method B 328, if necessary.
11.1 Inspection of the material shall be agreed upon be-
9.2 Physical Tests—The manufacturer and purchaser shall
tween the purchaser and the supplier as part of the purchase
agree on a representative number of specimens, for physical
contract.
tests inc
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