Abstract
This specification defines the criteria for composition and other requirements for sliding contact materials or brushes with a nominal composition by weight of 20% silver and 80% graphite. Materials shall adhere to specified requirements for chemical composition, density, shear strength, and microstructure. They shall also conform to typical values of Rockwell superficial hardness and specific resistance.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification defines the criteria for composition and other requirements for brushes with a nominal silver content of 80 %, by weight, with the balance being substantially graphite.
1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.
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 become familiar will 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.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
B613 Guide for Preparing Specifications for Miniature Brushes of Composite Materials for Sliding Electric Contacts
E18 Test Methods for Rockwell Hardness of Metallic Materials
ANSI Standard
C64.1 Brushes for Electrical Machines Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Keywords
electrical contacts; graphite; silver; sliding contacts; Electrical contact materials (silver alloy); Electrical contact materials (sliding contacts); Silver (electrical/electronic applications)--specifications; Silver-graphite electrical contact alloy; Sliding electrical contacts
ICS Code
ICS Number Code 77.120.99 (Other non-ferrous metals and their alloys)
DOI: 10.1520/B0664-90R12
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