FRITSCH PULVERISETTE 4 classic line - Manual (Page 31)

6.4.7 Wet grinding (grinding in a suspension)
DANGER!
Explosion hazard! Ignition hazard!
The device is not explosion-protected. If flammable liquids
are used, make sure that the heat developing in the
grinding bowl does not reach the solvent's boiling point.
Program appropriate cooling phases. If the vapour pressure
is too high, vapours may escape and ignite. If it can be
avoided, we recommend using non-flammable liquids or
liquids with a high boiling point. The boiling point should be
above 80 °C and above 100 °C for a long grinding duration.
During the transition to grinding in suspension, you can add a liquid aux-
iliary agent with high boiling point and low vapour pressure.
6.5 Clamping the grinding bowls
Carry out the following checks for every grinding before clamping the
grinding bowls:
n Check the rubber disc in the grinding bowl holder for damage:
Replace the rubber disc if it has been pressed flat. (The rough side
must face upwards!)
n The Teflon flat seal (for the seal between the lid and the bowl)
should not be damaged or soiled.
Replace heavily deformed Teflon flat seals.
n The lid and bowl surfaces that contact the Teflon flat seal must be
clean.
Using the device
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