ASTM-B476 › Historical Revision Information
Standard Specification for General Requirements for Wrought Precious Metal Electrical Contact Materials
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This specification covers general requirements common to wrought precious metal electrical contact alloy products in the form of sheet, strip, wire, and rod. The raw material shall be of such quality and purity that the finished product shall have the properties and characteristics prescribed in the applicable product specification. The product shall be produced by a combination of hot or cold working operations, it shall be finished, unless otherwise specified, by cold working, annealing, or heat treatment as may be necessary to meet the specified properties. Surfaces of all material furnished to this specification shall be smooth, clean, and free from scratches, stains, rough spots, slivers, laps, scale, pits, and any other injurious defects. Test methods such as chemical analysis and physical tests shall be performed accordingly.
Scope
1.1 This specification covers general requirements common to wrought precious metal electrical contact alloy products in the form of sheet, strip, wire, and rod. Unless otherwise specified in the purchase order or in an individual specification, these general requirements shall apply to wrought electrical contact materials where indicated in the applicable product specifications issued by ASTM.
1.2 In case of conflict, the requirements on the purchase order, the individual specification, and this general specification shall prevail in the sequence named.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
Significance and Use
For purpose of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with Practice E29.
| Property | Unit | Rounded Unit for Observed or Calculated Value | |
|---|---|---|---|
| Chemical composition | percent | ||
| Hardness Knoop (100-g load unless other- wise specified) Vicker (specify load) Rockwell (all scales, specify which) Rockwell superficial (all scales, specify which) | nearest unit on the last right hand place of figure of specified limit | ||
| Resistivity | μΩ·cm | ||
| Tensile strength | psi (MPa) | nearest 1000 psi (nearest 10 MPa) | |
| Yield Strength | psi (MPa) | nearest 1000 psi (nearest 10 MPa) | |
| Elongation | |||
| Below 5 % | percent | nearest multiple of 0.5 % | |
| 5 % and over | percent | nearest 1 % | |
| Grain size | |||
| Up to 0.055 mm incl. | mm | nearest multiple of 0.005 mm | |
| Over 0.055 to 0.160, mm, incl. | mm | nearest 0.01 mm | |
Keywords
contacts; electrical contact materials; wrought precious metal ; Coin-silver alloy; Electrical conductors--silver-copper (euctectic) alloy; Electrical conductors--silver-tungsten alloy; Electrical contact materials--specifications; Electrical insulating materials--specifications; General delivery requirements; Gold alloy--electrical contact materials; Metal electrical conductors; Noble metals; Palladium alloy electrical contact materials--specifications; Precious metals (wrought); Silver-copper eutectic electrical contact alloy; Silver (electrical/electronic applications)--specifications; Silver-tungsten electrical contact alloy; ICS Number Code 77.120.99 (Other non-ferrous metals and their alloys)
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77.120.99 (Other non-ferrous metals and their alloys)
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Document Number
ASTM-B476-01(2012)
Revision Level
2001 R12 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
May 15, 2012
Document Type
Specification
Page Count
4 pages
Committee Number
B02.05