FRITSCH PULVERISETTE 7 classic line - Manual (Page 31)

Grinding bowl /
Useful capacity (material to be
ground)
12 ml
0.5 - 5 ml 45 ml
3 - 20 ml
Stainless steel /
Tempered steel 30 g 90 g
Hardmetal tungsten carbide 50 g 200 g
6.1.3 Calculated weight of a ball
Ball diameter in mm 5 10 15
Material Density in g/cm 3 Calculated weight of a ball in g
Agate 2.65 0.17 1.39 4.68
Silicon nitride 3.25 0.20 1.7 5.48
Sintered corundum 3.9 0.25 1.99 6.72
Zirconium oxide 5.7 0.37 2.98 10.07
Stainless steel 7.8 0.51 4.08 13.78
Tempered steel 7.9 0.52 4.14 13.96
Tungsten carbide 14.9 0.96 7.70 25.98
To determine the weight of the required balls, the "calculated weight of
a ball" is multiplied by the "number" of balls required.
Example: A 45 ml agate bowl is to be filled with 185 agate balls with a
diameter of 5 mm.
Calculation: 0.17 g * 185 pcs » 31.45 g
31.45 g of grinding balls can be weighed and inserted in the grinding
bowl, thus avoiding the time required for counting the balls.
6.2 Filling quantities of grinding bowls
NOTICE!
Never operate the mill without grinding stock! This can
cause damage to the grinding balls and grinding bowls.
Using the device
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