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ASTM

ASTM B780-98

(Specification)

Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy

Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy

SCOPE
1.1 This specification covers an electrical contact material with the nominal composition of 75% silver, 24.5% copper, and 0.5% nickel in the form of rod, wire, strip, and sheet.

General Information

Status
Historical
Publication Date
22-Sep-1999
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 B780-98(2004) - Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy
Effective Date
01-May-2004

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ASTM B780-98 - Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact AlloyASTM B780-98 - Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy
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ASTM B780-98 - Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation: B 780 – 98
Standard Specification for
75 % Silver, 24.5 % Copper, 0.5 % Nickel Electrical Contact
Alloy
This standard is issued under the fixed designation B 780; 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.
1. Scope 5. Chemical Composition
1.1 This specification covers an electrical contact material 5.1 Material produced under this specification shall conform
with the nominal composition of 75 % silver, 24.5 % copper, to the chemical composition limits prescribed in Table 1.
and 0.5 % nickel in the form of rod, wire, strip, and sheet. 5.2 These specification limits do not preclude the possible
1.2 This standard does not purport to address all the safety presence of other unnamed elements, impurities, or additives.
concerns, if any, associated with its use. It is the responsibility Analysis shall be regularly made only for the minor elements
of the user of this standard to establish appropriate safety and listed in the table. However, if a user knows of elements that
health practices and determine the applicability of regulatory might be detrimental to their application or has other reasons
limitations prior to use. for requiring analysis for specific elements, then agreement
1.3 It is the responsibility of the user to become familiar between manufacturer and purchaser for both limits and
with all hazards including those identified in the appropriate methods of analysis should be required for elements not
Material Safety Data Sheet for this product/material as pro- specified.
vided by the manufacturer.
6. Mechanical Properties
2. Referenced Documents
6.1 The material shall conform to the applicable mechanical
2.1 ASTM Standards: properties prescribed in Table 2 or Table 3.
B 476 Specification for General Requirements for Wrought 6.2 All test specimens shall be the full thickness or diameter
Precious Metal Electrical Contact Materials as the size supplied when practical. The test procedures shall
follow the ASTM specifications referred to in Specification
3. Ordering Information
B 476.
3.1 Refer to Specification B 476.
6.3 All tests are to be conducted at room temperature, about
68°F (20°C).
4. Materials and Manufacture
4.1 Raw materials shall be of such quality and purity that
the finished product will have the properties and characteristics
prescribed in this specification.
4.2 The material shall be finished by such operations (cold
working, heat-treating, annealing, turning, grinding, or pick-
ling) as are required to produce the prescribed properties.
This specification is under the jurisdiction of ASTM Committee B-2 on
Nonferrous Metals and Alloysand is the direct responsibility of Subcommittee
B2.05 on Precious Metals.
Current edition approved May 10, 1998. Published October 1998. Originally
published as B 780 – 87. Last previous edition B 780 – 93.
Annual Book of
...

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