Retsch PM 200 - Manual (Page 25)

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Retsch GmbH
25
Grinding bowl identification
All grinding bowls of type "C" are easily identified by a
marking area SCH1, including the article No. and material.
Customer marking of grinding bowls
In addition to the aforesaid marking area, you can affix one
of the labels supplied (or available as accessories) to an
area SCH2 on the grinding bowl; this makes it possible to
apply extra markings, such as grinding bowl capacity etc.
The label is heat-resistant up to 150°C and the markings
you apply can be removed using alcohol, benzene or
acetone, for example.
Cleaning the grinding bowls
To clean the grinding bowls, the O-ring can be easily levered
out of groove Z on the underside of the cover.
Grinding bowls, including those with adhered ceramic
inserts, can be cleaned with alcohol, benzene or with normal
household washing-up liquid.
Do not expose grinding bowls with ceramic inserts to
temperature fluctuations during rinsing.
The ceramic inserts can crack if subject to sudden
changes of temperature.
Drying the grinding bowls
Grinding bowls can be dried at any time after cleaning in the
drying cabinet at the temperature indicated below.
Grinding bowl material Temperature
Special steel Up to 200°C
Stainless steel Up to 200°C
Tungsten carbide Up to 150°C
Sintered corundum Up to 120°C
Agate Up to 120°C
Zirconium oxide Up to 120°C
Silicon nitride Up to 120°C
Tips for ultra-fine milling
In many cases high finenesses can be achieved only by wet
milling.
In dry milling processes an improved fineness of milling can be
achieved by the addition of a few drops of stearic or acetic acid,
and use of milling balls with a diameter < 10 mm and a filling
level of 70-80% of the milling cup volume.