report details for FRITSCH laboratory instruments

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Protocol number:	M004072-1
Industry:	Chemistry
Feed Size:	5 mm
Desired Fineness:	< 100 µm
Quantity:	1-5 ml
Recommendation:	For small sample amounts, we recommend using a Mini-Mill PULVERISETTE 23 or a Vibratory Micro Mill PULVERISETTE 0.

	Mini-Mill PULVERISETTE 23 speed setting: 50Hz
Equipment:	15 ml grinding bowl made of tempered steel + 2x 15 mm Ø temp. steel grinding balls
Feed quantity:	2 ml
Feed Size:	< 5 mm
Grinding time:	4 min
Final fineness:	< app. 25 µm
Comments:	The 15 ml bowl of our Mini-Mill PULVERISETTE 23 can be filled with ~ 3 ml of activated carbon sample. After 4 minutes of grinding, a fineness of < 25 µm has already been achieved. Sample is not sticking so far, surfaces appear to be polished. A longer grinding time might still be possible, but the talk of < 100 µm is already reached. The grinding process has been aborted.

	Vibratory Micro Mill PULVERISETTE 0 amplitude: 2,0 mm
Equipment:	mortar and 50 mm Ø grinding ball made of agate
Feed quantity:	5 ml
Feed Size:	5 mm
Grinding time:	10 min
Final fineness:	< 100 µm
Comments:	Also a grinding with Vibratory Micro Mill PULVERISETTE 0 is possible. With the grinding set of the Vibratory Micro Mill PULVERISETTE 0, also 5 ml can be ground in one batch. With the lightweight grinding set (because agate uses to have a density of ~ 2,65 g/ml), it took about 10 minutes until the complete sample has been ground to < 100 µm. We are guessing that a similar sample amount might get ground faster in zirconium oxide (with ~ 5,7 g/ml), steel (5,9 g/ml) or a grinding set made of hardmetal tungsten carbide (~14,9 g/ml).

Activated carbon