Silicate glas

*1: By using 150g of glass, the 500ml bowl is filled by ~ 2/3. The maximum dry weight amount of sample should be <200g.

*2: See our particle size analysis of the original sample with our ANALYSETTE 22 NanoTec, Meas. Nr. 599 on separate page.

*3: After 3 minutes of grinding, a light sticking of sample occurs. After 5 minutes of grinding, the sticking becomes stronger (see picture); the grinding result has been moderately finer (compared to 3 minutes).

Interacting forces between fine particles (usually < 30µm) will become bigger as their own g-force. For that, particles use to stick together and become compressed by the balls. These clusters of fine particles will contain bigger particles which will not be ground any further. Therefore, a longer dry grinding is not possible. A d90 of <20µm is only possible by grinding in suspension.

After 5 minutes of grinding, about 20g of ground sample have been taken out and had been replaced with new sample.

*4: See our particle size analysis after 5 minutes of grinding with our ANALYSETTE 22 NanoTec, Meas. Nr. 603 on separate page.

*1: The sample of trial 1a has been used for this test.

*2: To reach the desired fineness (d90 < 20µm), we had to grind in suspension. Therefore, we had to add e.g. 60ml of Isopropyl-alcohol (IPA). Afterwards, the total volume of sample sunk (higher amounts of sample can be used for grinding in suspension).

*3: To avoid overpressure, we recommend grinding in steps of 5 minutes, followed by 10 minutes of programmed pausing times. The outside temperature of the bowl should not be >70°C. We recommend checking the temperature after several cycles and adjusting the grinding time/ pausing time, if necessary.

*4: See our particle size analysis after 15 minutes of grinding with our ANALYSETTE 22 NanoTec, Meas. Nr. 605 on separate page.

Summary: We recommend a direct grinding of sample with the proper amount of solvent (e.g. isopropyl-alcohol). Motor oil like viscosity should show the best grinding result. We are guessing that maximum 250g of sample can be ground per 500ml bowl. By using higher amounts, a longer grinding time is expected. For a maximum amount of sample, we recommend using a Planetary Mill PULVERISETTE 5 with 4 fasteners.