6.11 Wet Grinding with Highly Flammable Materials
Wet grinding using highly flammable materials is permitted with this device if certain
precautionary measures are complied with.
When using highly flammable materials such as hexane, isopropyl, ethanol, benzine etc. as a
grinding aid , the inside of the grinding jars should be classed as Zone 0, i.e. as a permanent
explosive mixture.
It is therefore necessary to prevent potentially explosive vapours escaping from the clamped
grinding jars during a grinding process or being able to reach places which have the necessary
ignition energy. These vapours are in particular also pressed outwards by the temperature rise
that takes place and by the consequent increase in pressure inside the grinding jar.
For this reason we urgently recommend that the user of the device (the employer) assesses the
existing hazards within a coherent explosion protection concept according to local conditions
before using such solvents and, where necessary, records supplementary organisational
measures in an explosion protection document.
This approach is regulated in the EU under Articles 118 and 118a of EC Directive 89/391/EEC.
Account must be taken of corresponding provisions in other countries outside the EU.
The following must be verified with respect to the device:
− It is necessary to consider the durability of the O-rings (EPDM 75° shore) when selecting
the solvent and the durability of the adhesive used when using ceramic inserts.
− The clamping screws of the grinding jars must be tightened firmly.
− Please note that the grinding jars can heat up considerably depending on the grinding jar
size, the ball filling, the speed and the grinding duration.
− Before removing the grinding jars, the tightness of the clamping screws must be check
anew.
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