With a start size of 2 cm, the particles fit into the feeding funnel. If larger particles will be included, we would recommend pre crushing the sample with a Jaw Crusher (like PULVERISETTE 1).
After 5 minutes, mainly electrostatic charged particles use to remain inside the grinding chamber. A grinding of higher amounts is still possible.
Because sample will be able to pass the gap after one dimension use to be smaller as 100 µm, length up to 350 µm will be found with a few particles after grinding.