Retsch DM 400 - Manual (Page 38)

Working with the disc mill
38
5.10 Sample removal
NOTICE!
The grinding disc support and the housing are made
from ductile cast iron. This cast steel is not rustproof. If
you grind slightly damp sample material, after grinding
you must dry the back of the grinding disc, the inside of
the grinding disc support and all parts of the housing
which come into contact with the sample. If you do not
do so, corrosion can be expected to occur.
Depending on the volume of the ground material, care
must be taken when removing the sample material
container (10) to remove it with both hands. Risk of tipping
over!
5.11 Final fineness
The achievable final fineness depends on the property of the sample
and the selected gap width (approx. 0.05 mm to approx. 12 mm).
Only one dimension of the individual particles in the fine material is
determined by the gap width, e.g. the material crushed in platelet form
in the fine product may well contain larger dimensions in an expansion
direction. Normally, however, after a second run with such materials,
the proportion of the sample with larger dimensions in this expansion
direction will have decreased significantly.