6.4.7 Wet grinding (grinding in a suspension)
DANGER!
Explosion hazard! Ignition hazard!
The device is not explosion-protected. If flammable liq-
uids 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-flam-
mable 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, e.g. water,
white spirits (boiling point 100 - 140°C), or alcohols with a high boiling
point (e.g. isopropanol)
We recommend that you only use so much liquid that the suspension has
the same consistency as motor oil. With this viscosity the best results can
be achieved in most cases.
6.5 Clamping the grinding bowls
6.5.1 Clamping with the "Safe-Lock" (5) tensioning device
Fritsch GmbH confirms that every Safe‐Lock clamping
system has been manufactured and tested to our
internal quality standards. Fritsch GmbH measures the
clamping force of each individual Safe‐Lock clamping
system. The clamping force must be in the range of 11.2
‐ 11.3 kN +/‐ 0.2kN.
Carry out the following checks for every grinding before clamping the
grinding bowls:
n
Has the rubber disc (6.1) been inserted into the grinding bowl
holder? The rough side should be facing upwards!
n
Check the rubber disc in the grinding bowl holder for damage:
Replace the rubber disc if it has been pressed flat!
n
The Teflon flat seal (for the sealing between lid and bowl) may not be
damaged or soiled.
Replace heavily deformed Teflon flat seals.
Using the device
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