• The Unbeaten Standard for Reproducible Sample Homogenisation

Laboratory Products

The Unbeaten Standard for Reproducible Sample Homogenisation

Jan 11 2023

Nothing matches the performance of the original. Retsch’s Ultra Centrifugal Mills have set standards in sample homogenisation for almost 50 years and are used by quality control laboratories worldwide.


The latest model ZM 300 comprises the essence of German engineering expertise combined with high-quality materials, smart accessories, and latest software technology. The powerful mill provides maximum grinding performance with an uneaten speed of 23,000 rpm. Classic centrifugal mills are usually limited to 18,000 rpm. At the same time, the ZM 300 was designed with operator convenience and safety in mind.

Grinding results are convincing: The ZM 300 produces particles which are 15 - 20% finer in comparison to conventional rotor mills, depending on the material. The high speed also allows for an increase of sample throughput by 10 - 15%.


The variable speed range allows for optimum adaptation of the grinding process to the sample requirements by keeping the grinding time as short as possible and the temperature increase as moderate as possible. Too much heat may have a negative effect on the grinding results, for example, if moisture or volatile components escape.

The ZM 300 is equipped with an integrated temperature sensor which measures the temperature of the cassette lid near the ring sieve. The measured temperature is constantly shown in the mill’s display, allowing the user to optimise the grinding process and improve reproducibility.

More information online


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