Retsch MM 200 - Manual (Page 9)

5/21/2012 9 Retsch GmbH
Technical data
Target group: Operating authority, operator
Machine type designation: MM 200
Use according to the intended purpose
This machine is not designed as a production machine. It is a
laboratory machine intended for 8 hour single-shift operation
with a 30% on-period.
The MM 200 is suitable for milling and homogenising soft,
fibrous, hard and brittle materials in the wet and dry state.
The MM 200 is designed for very small quantities of
approx. 0.5 to 8 ml. This corresponds to 25% of the
milling cup volume, and is used for fast super-fine
milling of 2 samples simultaneously. The closed
milling system guarantees complete recovery of the
samples. Owing to the extremely short milling time
and the high final fineness of the material to be milled
the MM 200 is also ideally suitable for sample
preparation for all spectral analyses.
Final finenesses of down to 1 µm can be achieved,
depending on the milling time and the specific
properties of the sample material. The optimum
milling cup filling is as a rule 1/3 of the milling cup
volume.
Exceptions to this are voluminous materials, such as
wool, leaves, grasses and suchlike. In these cases a
filling level of 70-80% is possible.
The sample quantity should not be less than 25% of the
milling cup volume.
The milling ball(s) may otherwise damage the
milling cups.
The milling cup materials and milling ball materials
must always be identical.
The milling ball(s) may otherwise damage the
milling cups.
Do not make any alterations to the machine and use
only spare parts and accessories approved by Retsch.
Otherwise the Declaration of Conformity with the
European directives by Retsch loses its validity.
Furthermore this will result in the loss of any kind
of guarantee claim.
Do not use ceramic or natural stone milling cups for
milling graphite or graphite mixtures.
The high lubricating properties of graphite cause high
milling ball speeds, the energy of which cannot be
absorbed by the material owing to its low density.
For this reason there is a danger that the ceramic
or natural stone inserts of the milling cups will be
destroyed by the ball(s).
For further information our application laboratory will
be pleased to assist you.