FRITSCH PULVERISETTE 5/4 classic line - Manual (Page 33)

Grinding bowl min. sample volumes max. sample volumes
500ml 80ml 225ml
250ml 30ml 125ml
80ml 1ml 30ml
6.3 Filling the grinding bowl
Do not fail to comply with the following sequence:
1.
Place the grinding balls in the empty bowl.
2. Fill grinding stock onto the balls.
3. Place the seal ring on the rim of the grinding bowl.
4. Place the lid on the grinding bowl.
6.4 Factors with an impact on grinding
6.4.1 Running time (grinding duration)
A longer grinding time will increase the percentage of fine material. To
reduce the grinding time, you can use a grinding bowl and grinding balls
with a higher density, and thus a higher impact energy.
6.4.2 Speed
Higher speeds shorten the grinding time and increase the share of fine
particles.
6.4.3 Reverse mode
n Useful for mechanical alloying
n Improvement of the homogeneity of the sample
6.4.4 Number and size of the balls
Pre-grind course, hard material with large balls:
reduced percentage of fine material!
Many small balls increase the percentage of fine material during
extended running time.
Using the device
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