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Wherever large pieces of brittle samples had to be prepared for analysis, many laboratories employed a jaw crusher such as Fritsch"s PULVERISETTE 1 for the pre-crushing stage, since the original feed size was too large to be handled by the final grinding mill. Previously samples could not be prepared for analysis in a single operation because a jaw crusher could not achieve an adequate product fineness and because grinding mills can only handle a limited range of feed size.

Fritsch have applied themselves to this particular problem and have developed a disk mill PULVERISETTE 13. In a relatively short processing time this mill can reduce material of a preset grain size to a fineness of minimum 0.1 mm even when processing relatively large samples (up to 20 mm edge length).

If the required fineness is of this order but the samples supplied to the laboratory include pieces with an edge length of over 20 mm, Fritsch can supply the perfect solution for this problem:

Both units, and thus their advantages, are combined:

The jaw crusher PULVERISETTE 1 is mounted on a metal frame over the disk mill PULVERISETTE 13 and the two units are connected by a specially designed hopper. This combination enables sample reduction of the jaw crusher"s maximum feed size (approx. 100 mm) to the disk mill"s finest preset average grain size of approx. 0.1 mm in one single operation.