An additional flywheel mass accounts for a very high torque which enables the SM 300 to grind many materials to analytical fineness in only one working run (RES Technology, see graphic on the right). The extra peak power derived from the flywheel mass is used to overcome potential blockages, even when grinding particularly tough materials. Additionally, the RES technology enables quick sample feeding.


Ideal for light & heat-sensitive materials

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

  • Efficient cooling of sample and cutting tools
  • Improved sample discharge from the grinding chamber
  • Particularly suitable for large volumes
  • The cyclone accommodates sample bottles of 0.5 – 1 – 2 – 5 and 30 liters


The SM 300 is equipped with double acting cutting bars which substantially increase the number and effectiveness of the cutting events. The parallel section rotor, for example, generates 18 cutting events per rotation.


Operation of the SM 300 is exceptionally simple and safe. The push-fit rotor and bottom sieves can be easily removed without tools. A safety switch prevents the mill from being started with the door open. An electronic safety check ensures that the door cannot be opened when the motor is running.


The hopper can be folded back to get full access to the grinding chamber which, in combination with the smooth surfaces, greatly facilitates cleaning the mill. So does the design of the bottom sieves which reduces trapping of sample pieces to a minimum.


Reduction of the speed leads to a decreased fine fraction of the sample and to more particles within the desired size range. Especially for this type of application, the lowest speed of the SM 300 was reduced to 100 min-1. This is also beneficial for grinding heat-sensitive materials: reduced speed results in less energy input, preventing the sample from getting too warm during the process.


Applications size reduction by cutting
Field of application agriculture, biology, chemistry / plastics, engineering / electronics, environment / recycling, food, medicine / pharmaceuticals
Feed material soft, medium-hard, tough, elastic, fibrous
Size reduction principle shearing, cutting
Material feed size* < 60 x 80 mm
Final fineness* 0.25 – 20 mm
Speed at 50 Hz (60 Hz) 100 – 3000 min-1
Rotor peripheral speed 4.7 – 20.3 m/s
Rotor diameter 129.5 mm
Types of rotors parallel section rotor / 6-disc rotor / V-rotor; 316L version: parallel section rotor
Types of hoppers universal, long stock, 316L version: long stock hopper
Material of grinding tools stainless steel, steel for heavy-metal free grinding, tungsten carbide, 316L
Sieve sizes trapezoid holes 0.25 / 0.50 / 0.75 / 1.00 / 1.50 mm
square holes 2.00 / 4.00 / 6.00 / 8.00 / 10.00 / 20.00 mm
Collector systems / capacities collecting receptacle 5 l / optional: 30 l
collecting unit 0.25 / 0.5 l
cyclone-suction combination (0.25 l – 30 l)
Drive 3-phase asynchronous motor with frequency converter
Drive power 3 kW with flywheel mass ~ 28.5 kg
Electrical supply data different voltages
Power connection 1-phase
Engine brake yes
Protection code IP 20
W x H x D closed 576 (1080 opened) x 1677 x 750 mm (with base frame and universal hopper)
Net weight ~ 160 kg
Standards CE
*depending on feed material and instrument configuration/settings

For more information contact the vendor or check out their website here


2 reviews for CUTTING MILL SM 300 – High-Performance Model with RES Technology

Rated 5 out of 5
5 out of 5 stars (based on 2 reviews)
Very good0%


Rated 5 out of 5
July 25, 2022

I find the CUTTING MILL SM 300 to be an excellent piece of equipment. We bought it in our plant analysis laboratory because a previous mill did not yield the required capacity in terms of the number of samples analyzed per week.

It has always shown good performance, a few minutes per sample. The equipment is highly safe, as the blade chamber is closed and rarely jams. This makes handling minimal and quite safe. The acquisition and maintenance costs are quite fair, with spare parts available on the market.

Jose Moises
Rated 5 out of 5
February 7, 2022

The SM 300 Mill is very effective as it allows the processing of samples of all kinds. In my laboratory we grind wood, cardboard, paper, plastics of various types, in general, all kinds of municipal waste. It is a very robust mill that allows us to homogenize samples with a very uniform particle size according to the sieve used and very easy to use for anyone without almost any kind of training or experience. I am very happy with the service and the equipment, as the cost of the equipment in general is very acceptable since it is of very good quality which guarantees me savings in maintenance, spare parts and consumables. Since it is a very robust equipment, as it is made to last, definitely I would recommend it since I have the old model of the sm300 the sm2000 and after 10 years it works like the first day. The sm300 I am sure that its performance will be the same, if not better than the old model.

Jonatan R

Vendor Information

  • Store Name: Retsch
  • Vendor: Retsch
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