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ASTM C748 1998 Edition, March 10, 1998
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Standard Test Method for Rockwell Hardness of Graphite Materials
Includes all amendments and changes through Reapproval Notice , 2015
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This test method covers Rockwell L scale hardness testing of graphite materials with grain size less than 0.8 mm and a hardness range between 0 and 120.

Test Methods E18 shall be followed except where otherwise indicated. 

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 

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.