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ASTM B664 1990 Edition, December 28, 1990
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Standard Specification for 80 % Silver-20 % Graphite Sliding Contact Material
Includes all amendments and changes through Reapproval Notice , 2012
Page Count:2
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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.

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.