With a gap setting of ~ 0,3 mm; most of the resulting particles will show a fineness < 500 µm as desired.
After 75 seconds of grinding, the complete amount of sample has been ground successfully. Particles bigger as 2 cm can jam the feeding funnel. In this case, it is recommended using e.g. a piece of wood to support the feeding process. Also a pre comminution of bigger particles (manually with a hammer or e.g. a Jaw Crusher PULVERISETTE 1 Model I) is possible.
By the amount inside of the collecting vessel, a grinding of up to 1 kg of sample is possible and might need about 3 minutes to be ground.
After grinding, about 8 ± 3 of sample use to remain mainly loose inside of the grinding chamber and can be brushed out easily.
To determine the achieved fineness, we sieved an aliquot of ~ 25 g of sample with a Vibratory Sieve Shaker ANALYSETTE 3 and a test sieve with 500 µm mesh.
Already 95,8 % of ground sample has been able to pass a 500 µm test sieve.
Also the sent reference of desired fineness has been sieved and has shown a fineness of only 78,9 % < 500 µm.
For this, the desired fineness has been fulfilled. Probably a gap setting between 0,3-0,4 mm result in particles of ~ 80 % < 500 µm too and the grinding speed will be increased.
Opened grinding chamber before feeding of sample. For more abrasive materials, also grinding disks made of zirconium oxide or hardmetal tungsten carbide use to be available.
Collecting vessel after a grinding of ~ 365 g of sample.
Opened grinding chamber after grinding. Sample use to be attached by electrostatic charge to the housing. Those kind of sample can be brushed off easily.