Fig. 11:Opening and closing the hood of the device
6.3 Specifications regarding grinding balls and grinding jars
A very large amount of energy is applied to the sample material on the MM 400. This large
amount of energy also affects the grinding jars and the grinding balls.
Depending on the grinding jar size , the following recommendations therefore apply to the
sample volume and ball sizes that can be used.
Wear or damage to the grinding balls and grinding jars
Use of different materials
− Greater wear or damage is possible when operating the device with
grinding balls and grinding jars whose individual components are made of
different materials.
• Only use grinding balls and grinding jars made of the same material.
Damage to the grinding jars
Incorrect filling of the grinding jars
− The grinding balls damage the grinding jar and the device if the grinding
jars are not filled with any material or with insufficient material.
• Do not operate the device without material in the grinding jars.
• The filling in the grinding jars must not be less than 25 % of the
grinding jar volume.
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