Planetary Ball Mill PM 100 RETSCH highest finenessFeed material soft hard brittle fibrous dry or wet Size reduction principle impact friction Material feed size 10 mm Final fineness 1 µm for colloidal grinding µmBatch size / feed quantity max 1 x 220 ml max 2 x 20 ml with stacked grinding jars No of grinding stations 1 Speed ratio 1 2 Sun wheel speed 100