ASTM B693-91(1996)e1
(Specification)Standard Specificationfor Silver-Nickel Electrical Contact Materials
Standard Specificationfor 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)
NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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.
e1
Designation: B 693 – 91 (Reapproved 1996) An American National Standard
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
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.
e NOTE—Section 14 was added editorially in May 1996.
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.
cation tests for determination of physical properties.
1.4 It is the responsibility of the user to become familiar
5.2 The tests shall be performed on production parts,
with all hazards including those identified in the appropriate
wherever practical, or applicable. (Small size contacts do not
Material Safety Data Sheet for this product/material as pro-
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
silver-nickel electrical contact materials are given in the
B 328 Test Method for Density, Oil Content, and Intercon-
nected Porosity of Sintered Metal Structural Parts and appendix.
Oil-Impregnated Bearings
6. Dimensions, Mass, and Permissible Variations
E 18 Test Methods for Rockwell Hardness and Rockwell
3 6.1 Permissible variations in dimensions shall be within the
Superficial Hardness of Metallic Materials
limits specified on drawings describing the contacts and
E 384 Test Method for Microhardness of Materials
accompanying the order, or shall be within the limits specified
3. Ordering Information
in the purchase order.
3.1 Orders for this material under this specification shall
7. Workmanship, Finish, and Appearance
include the following information.
7.1 The parts shall be free of defects in material or process-
3.1.1 Dimensions (see Section 6).
ing, which would seriously affect their performance.
3.1.2 Chemical composition (see reference table in Appen-
dix X1).
8. Sampling
3.1.3 Physical properties (see Section 5 and reference table
8.1 Lot—Unless otherwise specified, a lot shall consist of
in Appendix X1).
parts of the same form, and dimensions, made of powders of
3.1.4 Certification (see Section 13).
the same particle size range and composition, processed under
3.1.5 Other features as agreed upon between the seller and
the same conditions, and submitted for inspection at one time.
the user.
9. Number of Tests and Retests
9.1 Chemical Analysis—The manufacturer and purchaser
This specification is under the jurisdiction of ASTM Committee B-4 on
shall agree on a representative number of specimens for
Materials for Thermostats, Electrical Heating and Resistance, Contacts and Con-
chemical analysis. A representative sample of chips may be
nectors and is the direct responsibility of Subcommittee B04.02 on Electrical
Contact Materials.
obtained by milling, drilling, or crushing with dry tools,
Current edition approved Aug. 15, 1991. Published November 1991. Originally
(without lubrication). In order to obtain free chips, the parts
published as B693 – 81. Last previous edition B693 – 87.
selected for test shall have the oil extracted in accordance with
Annual Book of ASTM Standards, Vol 02.05.
Annual Book of ASTM Standards, Vol 03.01. Test Method B 328, if necessary.
B 693
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 including microstructure.
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