FRITSCH Planetary Ball Mills – high-performance all-rounder in routine laboratory work
The Planetary Micro Mill PULVERISETTE 7 premium line with 2 grinding stations is designed for a broad range of applications and ideally suited for loss-free grinding down to a final fineness of 100 nm of hard, medium-hard and brittle materials. Depending on the desired final fineness, the grinding can be performed dry, in suspension or in inert gas.
In addition to comminution, you can also use Planetary Mills for mixing and homogenising emulsions and pastes or for mechanical activation and alloying in materials research.
| Working principle | impact force |
| Optimal for material type | hard, medium-hard, brittle |
| Number of grinding stations | 2 |
| Grinding tools | grinding bowls and grinding balls |
| Materials of the grinding tools | agate, sintered corundum, silicon nitride, zirconium oxide, hardened stainless steel, hardmetal tungsten carbide |
| Grinding bowl sizes | 20, 45, 80 ml |
| Grinding ball diameter | 0.1 - 20 mm |
| Max. feed size (depends on material) | 5 mm |
| Sample quantity | 1-60 ml |
| Final fineness (depending on material) | < 0.1 µm |
| Typical grinding time down to analytical fineness | 3 min |
| Grinding process | dry/wet |
| Grinding in inert gas | yes |
| Gas pressure and temperature measurement | yes |
| Max. rotational speed grinding bowls | 2200 rpm |
| Rotational speed of main disk | 150-1100 rpm |
| Transmission ratio planetary disk / grinding bowl | i relative = 1 : -2 |
| Effective diameter of main disk | 140 mm |
| Centrifugal acceleration (g = 9.81 m/s²) | 95 g |
| Interfaces | USB |
| Electrical details | 100-120 V / 200-240 V/1~, 50-60 Hz, 1200 Watt voltage, indicated by customer is set |
| Emission sound pressure level at the workplace according to DIN EN ISO 3746 (depending on the material to be ground, grinding bowls/balls, selected rotational speed) | LpAd = 80 dB |
| Weight | 44 kg |
| Dimensions (W x D x H) | bench top instrument 40 x 58 x 36 cm |
In the operating manual, under DOWNLOADS, you find the appropriate rotor speed limits for grinding ball-diameters and grinding bowls made of agate.
