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Ultra Centrifugal Mill ZM 300

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Rotor mills are used for high-speed size reduction of soft to medium-hard as well as temperature-sensitive or fibrous materials. 
The powerful Ultra Centrifugal Mill ZM 300 provides maximum grinding performance combined with ease of use. The variable speed from 6,000 to 23,000 rpm allows for gentle, neutral-to-analysis sample preparation in a very short time.

Thanks to an integrated temperature monitoring system, reproducibility is guaranteed even for long grinding processes or pulverization of large sample volumes.

The wide selection of rotors, ring sieves and cassettes makes the ZM 300 a true allrounder which meets the requirements of a great variety of size reduction tasks.

"Very easy to operate the device. Relatively easy to clean after grinding (avoiding cross-contamination)."

Jaap Winkelhorst

BASF

"Grinding is very quick. We use the cyclone connection that makes the grinding process easy with large patches."

Eija Fogelholm

Finnish Customs Laboratory

"This equipment is a must have for ingredients science and application laboratories. Easy to use, low maintenance and safe to operate. It provides reproducible results. "

Petros Gebreselassie

Ashland Inc.

"The Retsch Ultra centrifugal mill is the one “grinder” that gave us the particle size and hence the best analytical result (e.g. oil content) in a variety of oilseed sample types. Over 30 years in the laboratory, allows me to call the Retsch mills/ grinders as the “gold standard” when it comes to sample preparation."

Douglas DeClercq

DRD

"This is best grinder in our Lab. We also have other brands, but the Retsch Mill is a top ranking. All stainless-steel parts are very easier to clean. "

Tai Ha

Nebraska Department of Agriculture Laboratory

"This grinder performs wonderfully. We have had ours close to 5 years and have not had an issue. We grind anywhere from 300-500 samples per week.

Mary Ann Barrett

Jennie-O Turkey Store

"Highly effective, easy to use, high quality product."

Ashley Brown

ISK Biosciences Corporation

"High quality instrument, fast processing time, easy to use and clean! "

Alec Keyzer

Bureau Veritas

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The standard for food & feed

  • Gentle high-speed pulverization due to pre- and fine grinding in one working run
  • Optimum process control and reproducibility based on monitoring of the cassette temperature
  • Patented cassette system for maximum sample recovery and easy cleaning
  • Optional cassette for sample volumes up to 600 ml
  • Wide speed range from 6,000 to 23,000 rpm
  • Defined final fineness due to ring sieves with aperture sizes from 0.08 – 10 mm
  • Collecting vessels for sample volumes from 250 ml to 4.5 l
  • Automated vibratory feeder and various cyclone systems available

Ultra Centrifugal Mill ZM 300 Increased reproducibility through temperature monitoring

The speed range from 6000 to 23000 rpm 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 optimize the grinding process and improve reproducibility.

Ultra Centrifugal Mill ZM 300

Polymer POM

Polymer POM

Polymer PP

Polymer PP

Grinding animal feed

Grinding animal feed

Cryogenic Grinding

Cryogenic or cold grinding is the ideal solution for pulverizing samples that cannot be reduced to the required fineness at room temperature. This procedure involves the use of grinding aids such as liquid nitrogen (-196 °C, embrittlement of the sample outside the mill) or dry ice (-78 °C, sample/dry ice mixture) to embrittle the sample material by cooling, and thus improve the breaking behavior.

In addition, highly volatile components are better preserved in the sample by cooling. Cryogenic grinding is easy to perform with the ZM 300 and is recommended especially for plastics or very temperature-sensitive samples. The video shows the process with the predecessor model ZM 200, which is identical in the ZM 300.

This video shows dryice grinding of plastic granules with the ZM 200 which also applies to the ZM 300.

When operated with the optional cyclone-suction-combination, the ZM 300 is also suitable for grinding low-density or heat-sensitive sample materials.

  • Efficient cooling of sample and grinding tools
  • Improved sample discharge from the grinding chamber
  • Particularly suitable for large volumes
  • The cyclone accommodates sample bottles of 0.25, 3 and 5 liters
  • Ideal for cryogenic grinding
Ultra Centrifugal Mill ZM 300
Ring sieves

Ring sieves

For the ZM 300 ring sieves with reinforced rim are used which are equipped with four grooves for secure locking. Distance sieves, also secured and fixed by four grooves, have a gap between the sieve mesh and the rotor, which reduces shearing effects and thereby heat generation.

Rotors

Rotors

Rotors are available with either 6, 12 or 24 teeth. The standard rotor with 12 teeth is suitable for almost any material and requirement. For fibrous samples, such as straw, the rotor with 6 teeth is typically used, while for fine samples the rotor with 24 teeth is best suited.

Heavy-metal-free grinding

Heavy-metal-free grinding

For neutral-to-analysis work, or for pulverizing abrasive samples, grinding tools in various materials are available: titanium (titanium-niobium coating), steel 1.4404, tungsten carbide coating.

Collecting vessels

Collecting vessels

In the standard collecting vessel with 900 ml nominal volume, up to 300 ml of sample can be ground in one working step. With the large-volume cassette, the useful volume can be doubled to 600 ml. When utilizing a cassette with cyclone, various collecting vessels up to 4,500 ml useful volume are available.

Vibratory Feeder DR 100

Vibratory Feeder DR 100

The Vibratory Feeder DR 100 is controlled via an interface and conveys material in a load-dependent manner to the hopper of the ZM 300. This procedure ensures uniform grinding with maximum sample feed. The use of a feeder is particularly advantageous for large sample quantities.

The ZM 300 is easy and safe to operate. The large touch display with rotary knob permits convenient entry of the grinding parameters. It shows the current cassette temperature and load during grinding which helps to prevent overloads by feeding the sample too quickly.

A push-fit system without screws and the patented cassette principle allow for easy insertion and removal without tools.

As a result, cleaning rotors and ring sieves is particularly quick and easy. All parts in contact with the sample can be cleaned under running water or in the dishwasher.

Ultra Centrifugal Mill ZM 300 Typical Sample Materials

The versatile Ultra Centrifugal Mill ZM 300 processes materials such as bones, cereals, chemical products, coal, coffee beans, collagen, corn, dried fruit and vegetables, dried larvae, drugs, electronic components, feed pellets, fertilizers, food, grain, graphite, minerals, paper, pharmaceutical materials, plant materials, polymers, powder coatings, rice, rubber, seeds, spices, straw, sweets, textiles, tobacco, waste, wood

 powder coatings

powder coatings

 coffee beans

coffee beans

PET flakes

PET flakes

 herbs

herbs

To find the best solution for your sample preparation task, visit our application database.

Ultra Centrifugal Mill ZM 300 Functional Principle

In the Ultra Centrifugal Mill ZM 300 size reduction takes place by impact and shearing effects between the rotor and the fixed ring sieve. The feed material passes through the hopper (with splash-back protection) onto the rotor. Centrifugal acceleration throws it outward with great energy and it is pre-crushed on impact with the wedge-shaped rotor teeth moving at a high speed. It is then finely ground between the rotor and the ring sieve.

This 2-step grinding ensures particularly gentle but fast processing. The feed material only remains in the grinding chamber for a very short time, which means that the characteristic features of the sample to be determined are not altered. The ground sample is collected in the collecting cassette surrounding the grinding chamber or in the downstream cyclone or paper filter bag.

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