A great variety of different laboratory samples can be ground with this mill - dry or in suspension - quickly and with minimal contamination or loss, down to less than 1 micron
For decades, research and industrial laboratories have had a very reliable and versatile assistant to prepare samples - the Pulverisette 7 planetary micro mill from Fritsch.
A great variety of different laboratory samples can be ground with this mill - dry or in suspension - quickly and with minimal contamination or loss, down to less than 1 micron (depending on the material).
In addition, the Pulverisette 7 is very well suited for the mixing and homogenising of emulsions and pastes.
The principle of comminution is that grinding occurs as the result of impact and friction, by grinding balls in grinding bowls which turn autonomously, while also being moved in orbit.
Compared with gravitational and centrifugal ball mills the grinding balls in a real planetary mill like the Pulverisette 7 achieve a significantly higher grinding energy.
This energy reaches - depending on the adjusted rotational speed of the mill - a normal acceleration of up to 47g (47 times earth acceleration).
As a result the planetary mill produces an extremely high grinding efficiency and short grinding times and generally a narrower particle size distribution, as well as additional impact grinding and enhanced homogenisation of the sample.
The corresponding grinding bowls are offered in three different sizes (12ml, 25ml, 45ml).
In order to avoid troublesome contamination as a result of abrasion during the grinding process, Fritsch offers grinding bowls and balls made of eight different materials.
If larger quantities (up to approximately 1000ml) are to be processed, then the Pulverisette 5 planetary mill is available.
The same principle of operation is utilised as with the Pulverisette 7, and fineness of <1 micron (dependant upon material) can be achieved.
