| http://www.w3.org/ns/prov#value | - It is preferred that the solid particles in the preparation have a d50 value of from 0.1 to 5 ??m, preferably from 0.2 to 2 ??m and most preferably from 0.35 to 1 ??m, for example 0.7 ??m as measured using a Sedigraph??? 5100 of Micromeritics Instrument Corporation.
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