Variable Speed Rotor Mill – the all-purpose mill for rapid grinding

The FRITSCH Variable Speed Rotor Mill PULVERISETTE 14 grinds soft to medium-hard samples fast and effectively – even for sample preparation in accordance to RoHS analysis.

Temperature-sensitive samples are ground thermally very gently, because of the extremely high rotor speed. Difficult-to-grind samples such as styrene, polyester, synthetic resins, films, PVC, PP and PE can be made brittle, for instance through addition of liquid nitrogen, and then ground to analysis fineness. Even oily and fatty materials can be easily crushed by using the pin insert for grinding without sieve.

The Variable Speed Rotor Mill PULVERISETTE 14 with a real top speed of 20.000 rpm is the Turbo Mill for sample preparation. With a feed particle size of < 10 mm, a final fineness of up to 40 µm can be achieved. The throughput depends on the material and lies between 0.05 and 5 kg per hour. Rotors, sieve rings and collecting vessels made of different materials and sizes enable an optimal adjustment of the system to the application.

Here is an example of practical application: Characterization of polymers

The analysis of polymers is executed with the aid of gel permeability chromatography. This process is a kind of liquid chromatography similar to the HPLC. Due to the size of the molecules the separation takes place in the solution. Depending on the detector, the average value of the mol mass, polydispersity and the viscosity of the polymer sample are determined.

Here suitable sample preparation is important in order to dissolve the polymers. The degradation - the destruction of the characteristics of the material - has to be avoided though. An ideal solution of the sample preparation is the Variable Speed Rotor Mill PULVERISETTE 14. Here a final fineness of < 80µm is achieved. An embrittlement of the polymere with liquid nitrogen or the grinding while adding dry ice avoid the degradation. The following graphics illustrate the analysis of PE (polyethylene) and PP (polypropylene).

You may browse additional experience oriented examples as well as comparison grindings on our website in the area SOLUTIONS.

Your advantages with the FRITSCH Variable Speed Rotor Mill PULVERISETTE 14

• Rapid sample throughput as a result of high-speed grinding and simple handling
• Simple grinding preparation and removal of the ground sample with interchangeable tool system consisting of rotor, collection vessel, sieve insert and labyrinth seal
• Rotor and collecting vessel can be changed without tools
• Easy, contamination free cleaning of all grinding parts outside of the instrument
• Extensive accessories
• Controlled rotor torque (6,000 – 20,000 rpm)
• High speed stability even under full load
• Optimum cooling in grinding chamber due to very high air throughput
• Rapid-action clamping lock

Test the FRITSCH Variable Speed Rotor Mill!

Send us your most difficult sample – we will carry out a free sample grinding for you free of charge. Compare yourself!