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.
| Applications | fine grinding |
| Field of application | agriculture, biology, chemistry / plastics, construction materials, engineering / electronics, environment / recycling, food, geology / metallurgy, medicine / pharmaceuticals |
| Feed material | soft, medium-hard, brittle, fibrous |
| Size reduction principle | impact, shearing |
| Material feed size* | < 10 mm |
| Final fineness* | < 40 µm |
| Batch size / feed quantity* | 300 ml with standard cassette 600 ml with volume cassette 4500 ml / 2500 ml / 450 ml / 230 ml with cyclone |
| Speed at 50 Hz (60 Hz) | 6,000 - 23,000 min-1, free selectable |
| Rotor peripheral speed | 31 - 119 m/s |
| Rotor diameter | 99 mm |
| Types of rotors | 6-tooth rotor / 12-tooth rotor / 24-tooth rotor |
| Material of grinding tools | stainless steel, titanium, stainless steel with wear-resistant coating |
| Sieve sizes | trapezoid holes 0.08 / 0.12 / 0.20 / 0.25 / 0.50 / 0.75 / 1.00 / 1.50 / 2.00 mm round holes 3.00 / 4.00 / 5.00 / 6.00 / 10.00 mm |
| Setting of grinding time | no |
| Collector capacity | 900 ml with standard cassette 1200 ml with volume cassette 5000 ml / 3000 ml / 500 ml / 250 ml with cyclone |
| Drive | 3-phase asynchronous motor with frequency converter |
| Power connection | 1-phase |
| Protection code | IP 20 |
| Power consumption | 1750 VA ((200..240V), 1400 VA (110..120V) |
| W x H x D closed | 452 x 431 x 426 mm |
| Net weight | ~ 38 kg |
| Standards | CE |
*depending on feed material and instrument configuration/settings
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.
