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Perlite (Obsidian)

Protocol number:	M001121
Industry:	Geology / mineralogy
Feed Size:	~ 3mm
Desired Fineness:	d90 < 20µm
Quantity:	5g
Recommendation:	We recommend using the Planetary Mono Mill PULVERISETTE 6 classic line for grinding your sample. In this case, it wasn’t necessary to grind in suspension to achieve the desired endfineness.

Result 1

	Planetary Mono Mill PULVERISETTE 6 classic line main disk speed: 600 rpm
Equipment:	80 ml grinding bowl made of agate (SiO2) + 5x 20 mm Ø grinding balls made of agate
Feed quantity:	5 g
Feed Size:	~ 3 mm
Grinding time:	5 min
Final fineness:	d50 <5,0 µm d90<19,6 µm
Comments:	The achieved grinding result after 5 minutes of dry grinding with agate for balls and bowl use to be extraordinary fine. Usually, particles tend to stick to each other when a fineness of d50 < 20µm is reached. Then fine ground particles just become compressed to clusters. Those clusters will contain bigger particles, which will not be ground any further. Also a second trial with silicon nitride for balls and bowl has shown a similar result after the sample grinding time. The particle-size-analysis was done with our Laser-Particle-Sizer analysette 22-Compact