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Activities – the grinding of solid material

The milling of solids is performed by the action of mechanical forces regardless of whether we use raw materials or intermediate products. Depending on the physical properties of the material to be shredded and on the force applied, the particle size as well as the particle size distribution and the grain shape of the solid material are being modified. Desired goals to be achieved are

  • to enlarge the surface of the raw material,
  • to produce a specific defined particle size distribution or
  • to influence or produce the flow behaviour.

These create the preconditions for intended further utilization and application.

The different grinding steps can be classified as follows.
The d50 value is given as an indication in µm and mm.

  in µm in mm
Micronization, Ultra-fine milling 1 - 50 0,001 - 0,05
Fine milling 50 - 500 0,05 - 0,5
Milling (coarse crushing) 500 - 5.000 0,5 - 5
Fracturing (fine)   5 - 50
Fracturing (coarse)   > 50

1 micrometer (unit: µm) conforms to a thousandth of a millimetre.
Example: The diameter of a human hair is about 70 µm on average.

In dependence on the milling material we can implement the grinding process with compressed air or inert (protective gas atmosphere). In addition to that we offer Cryogenic Milling by which the milling is performed by adding liquid nitrogen.


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Am tiefen Graben 6, DE-99510 Apolda
Phone: +49 (0)3644 5058-0
Fax:     +49 (0)3644 5058-99