This makes the values for the flowability according to Jenike, the bulk density and the angle of repose almost identical for the samples produced with both grinding methods. In the three larger particle fractions the values of the flowability and the bulk density increase with larger particle sizes. Here the increase is greater for the samples ground with a hammer mill than for the particles ground with the roller mill. The values of the angles of repose become smaller with increasing particle size, with the decline being larger for samples ground with a hammer mill. It can be assumed that this behaviour is caused by the larger surface roughness of the particles after grinding with a roller mill.