RETSCH"s Planetary Ball Mill PM 100 CM The new Planetary Ball Mill PM 100 CM offers all the performance and convenience of the classic PM 100. It pulverizes and mixes soft, medium-hard to extremely hard, brittle and fibrous materials and is used wherever the highest degree of fineness down to the submicron range is required. It is suitable for dry and wet grinding. In contrast to the PM 100 the speed ratio of sun wheel to grinding jar is 1:-1, i.e. the mill operates in centrifugal mode. This results in a different ball movement so that the sample is not so much crushed by impact effects but more gently ground by pressure and friction which allows for a lower temperature rise in the grinding jar and less abrasion. The PM 100 CM offers an excellent alternative for all applications where size reduction must not necessarily be carried out with maximum energy input.