1.1 This test method covers a procedure for measuring individual pellet hardness of carbon black by the automated pellet hardness tester. 1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.

ASTM D5230-12a
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Standard Test Method for Carbon Black — Automated Individual Pellet Hardness
ASTM International , 08/15/2012