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ASTM B685-90(1995)e1

(Specification)

Standard Specification for Palladium-Copper Electrical Contact Material

Standard Specification for Palladium-Copper Electrical Contact Material

SCOPE
1.1 This specification covers a 60% palladium-40% copper alloy in the form of rod, wire, strip, and sheet material for electrical contacts.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.  
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 or material as provided by the manufacturer. Table 1.

General Information

Status
Historical
Publication Date
09-Jun-2001
ICS
77.120.99 - Other non-ferrous metals and their alloys
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.05 - Precious Metals and Electrical Contact Materials and Test Methods
Current Stage
Ref Project

Relations

Replaced By
ASTM B685-01 - Standard Specification for Palladium-Copper Electrical Contact Material
Effective Date
10-Jun-2001

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ASTM B685-90(1995)e1 - Standard Specification for Palladium-Copper Electrical Contact MaterialASTM B685-90(1995)e1 - Standard Specification for Palladium-Copper Electrical Contact Material
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ASTM B685-90(1995)e1 - Standard Specification for Palladium-Copper Electrical Contact Material
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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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 685 – 90 (Reapproved 1995) 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
Palladium-Copper Electrical Contact Material
This standard is issued under the fixed designation B 685; 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.
e NOTE—Section 8 was added editorially in June 1995.
A
TABLE 1 Typical Hardness Values for Strip
1. Scope
1.1 This specification covers a 60 % palladium-40 % copper
B
Temper HR30T HR15T HK (100 g)
alloy in the form of rod, wire, strip, and sheet material for
Annealed 64 82 155
electrical contacts.
1.2 The values stated in inch-pound units are to be regarded 37 % reduction 81 92 255
A
as the standard. The values in parentheses are for information
Specification for tensile and elongation properties or hardness ranges, but not
both, shall be agreed to between supplier and purchaser at the time of contracting
only.
for delivery.
1.3 This standard does not purport to address all of the
B
The Knoop hardness indentations shall be made so that the long axis of the
safety concerns, if any, associated with its use. It is the
indenter is parallel to the rolling direction of the material.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- compounds not specified in the table of chemical composition.
bility of regulatory limitations prior to use.
5. Mechanical Requirements
1.4 It is the responsibility of the user to become familiar
5.1 The criterion for temper designation shall be one of the
with all hazards including those identified in the appropriate
following: Rockwell, Rockwell superficial, microhardness
Material Safety Data Sheet for this product or material as
(Vickers or Knoop), or tensile strength (hardness or tension,
provided by the manufacturer.Table 1
but not both) as defined in the contract or order.
2. Referenced Documents
5.2 Mechanical properties shall conform to the listings of
2.1 ASTM Standards: Table 3.
B 476 Specification for General Requirements for Wrought
5.3 All test specimens shall be full size when practical.
Precious Metal Electrical Contact Materials 5.4 All tests are to be conducted at room temperature, 65 to
85°F (18 to 29°C).
3. Manufacture
6. General Requirements
3.1 Raw materials shall be of such quality and purity that
the finished product will have the properties and characteristics
6.1 The provisions of Specifications B 476 shall apply to all
prescribed in this specification.
materials produced to this specification.
3.2 The material shall be finished by such operations (cold
7. Inspection and Testing
working, annealing, tu
...

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9.1 Proprietary methods for manufacture of these materials vary significantly among suppliers and these methods influence such properties as arc erosion, contact resistance, and the tendency to weld in service. Since the performance of contacts in a device depends on numerous factors outside the contact itself (opening speed, closing speed, contact pressure, contact bounce, environmental variations, assembly technique and variations, etc.), this specification cannot ensure performance control in the application. As part of the qualification on initial samples, it is recommended that the user functionally test the materials electrically for all devices applicable to the material's use. This specification provides a means for the contact manufacturer and contact user to reach agreement on the details of material to be supplied for a specific use and reasonable assurance that future lots will be similar in properties and microstructure to the initial test or sample contact supplied.
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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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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 become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
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