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brittle elastic fibrous Material feed size: ≤ 8 mm Final fineness: ~ 5 µm Setting of vibrational frequency: digital soft medium-hard 3 - 30 Hz (180 - 1800 min-1)involve grinding). With Lloyd's ball milling book having sold over 2000 copiesPlanetary ball mills 9 . Vibration Mills 10 . Mixer Mill MM 400 11 Feed material: hard,