FRITSCH PULVERISETTE 7 premium line - Manual (Page 33)

Exception: Tungsten carbide balls (<20 mm) may be temporarily (a few
minutes) combined with grinding bowls made of tempered steel.
5.2.1 Useful capacity of the grinding bowls
Grinding bowl 20 ml 45 ml 80 ml
Useful capacity
(material to be
ground)
1-9 ml 3-20 ml 10-30 ml
5.2.2 Size of the grinding balls
Type of feed material Suitable ball diameter
Hard samples with a maximum feed size of 5 mm 15 mm / 20 mm
Average feed size of 0.5 – 1 mm 15 mm / 10 mm
Fine material 0.1 – 0.5 mm 10 mm / 5 mm
Very fine material < 0.1 mm 3 mm and smaller
Homogenisation of dry or liquid samples 10 mm / 5 mm
NOTICE!
It is not advisable to mix balls of different diameters. (If
balls with different diameters are used, increased wear to
the balls is to be expected.)
Using the device
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