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For the finest comminution of hard to soft grinding material, dry or in suspension, down to colloidal fineness. For mixing and perfect homogenising of emulsions and pastes.
Maximum sample quantity: 40 ml
Areas of application
Chemistry, biology, pharmacology and pharmaceutical research, medicine, nuclear research, spectroscopy, x-ray fluorescence.
Method of operation
The grinding sample is comminuted by high-energy impacts from grinding balls and friction between balls and the grinding bowl wall.
Features overview
- Very fast, uniform comminution
- Lossless grinding - even suspensions thanks to seal ring in the grinding bowl
- Reproducible grinding result
- High grinding ball energy (up to 39 times Earth gravity)
- Grinding tool materials of analysis purity of 8 different materials for contamination-free grinding
- Simple cleaning
- Certified safety (CE mark)
- 2-year warranty
Equipment
The standard equipment delivered with the Planetary Micro Mill PULVERISETTE 7 classic line does not include grinding bowls or balls, which are available in 8 different materials and must be ordered as accessories. The voltage specified in the order is preset.
Voltage/connection values: | 100-120/200-240 V/1~ |
Frequency: | 50-60 Hz |
Input Power: | 880 W |
External control: | Yes/RS232 |
Operating principle: | Impact |
Grinding tools: | Grinding bowls (12 + 45 ml) and grinding balls (0.5 - 15 mm) |
Materials of the grinding tools: | Agate, sintered corundum, silicon nitride, zirconium oxide, stainless steel, hardened steel, hardmetal tungsten carbide, polypropylene |
Main disc speed: | 100-800 rpm |
Gear ratio: | i relative = 1 : -2 |
Max. feed size: (depends on material) | 5 mm |
Min. sample quantity: | 0.5 ml |
Max. sample quantity: | 40 ml |
Final fineness: | < 1 µm |
Dimensions: (W x D x H) | Table unit 37 x 53 x 50cm |
Weight: | 35 kg |
Suitable for the following material samples
hard, medium-hard, brittle, moist
Accessories
Please note: For this FRITSCH mill, you require at least two grinding bowls of your choice and the corresponding number of grinding balls. The grinding bowl material must also be harder than the material to be ground. In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, larger or heavier balls with a higher density can be used, e.g. tungsten carbide balls in a steel bowl or zirconium oxide balls in a silicon nitride bowl. Please take note of the useful capacity, this is not identical with the bowl volume!
Grinding bowl 45 ml volume classic line
Grinding bowl 12 ml volume classic line
Grinding balls 15 mm diameter for grinding bowl 500 ml, 250 ml, 80 ml, 45 ml
Grinding balls 10 mm diameter for grinding bowl 500 ml, 250 ml, 80 ml, 45 ml, 20 ml, 12 ml
Grinding balls 5 mm diameter for grinding bowl 500 ml, 250 ml, 80 ml, 45 ml, 20 ml, 12 ml
Grinding balls ≤ 3 mm diameter for grinding bowl 500 ml, 250 ml, 80 ml, 45 ml, 20 ml, 12 ml (100 g package)
Grinding set selection aid for the PULVERISETTE 7 classic line
Material data for the grinding bowls/balls
Material | Main component of the material | Density g/cm³ | Abrasion resistance | Used for grinding material |
Agate | SiO2 | 2.65 | good | soft to medium-hard samples |
Sintered corundum | Al2O3(99.7 %) | 3.8 | moderately good | medium-hard, fibrous samples |
Silicon nitride | Si3N4 | 3.25 | extremely good | abrasive samples, iron-free grinding |
Zirconium oxide | ZrO2 | 5.9 | very good | fibrous, abrasive samples |
Stainless steel | Fe – Cr - Ni | 7.8 | moderately good | medium-hard, brittle samples |
Tempered steel | Fe - Cr | 7.9 | good | hard, brittle samples |
Hardmetal tungsten carbide | WC | 14.95 | very good | hard, abrasive samples |
Polypropylene | 0.9 | sufficient | for homogenisation |
I. Grinding balls ≥ 5 mm: Recommended number of balls per grinding bowl
Grinding bowl/ Useful capacity (grinding material) |
12 ml 0,5 – 5 ml |
45 ml 3 – 20 ml |
Kugeln Ø | ||
15 mm | 7 | |
10 mm | 6 | 18 |
5 mm | 50 | 180 |
II. Grinding balls ≤ 3 mm: Recommended ball mass per grinding bowl in grams
Grinding bowl/ Useful capacity (grinding material) |
12 ml 0.5 - 5 ml |
45 ml 3 - 20 ml |
Material | ||
Zirconium oxide | 20 g | 70 g |
Stainless steel / tempered steel | 30 g | 90 g |
Hard metal tungsten carbide | 50 g | 200 g |
Grinding balls with diameter 3 mm and smaller must be weighed out. The above table provides you with the necessary weight to be included per grinding bowl.
The quantity of grinding balls can be reduced by up to 15%; however, increased wear should be expected in this case. The specified number/mass of balls per bowl is the minimum quantity; depending on the material behaviour, it may be necessary to increase this.
In normal cases, grinding bowls and balls of the same material are used. To shorten the grinding time, larger or heavier balls with a higher density can be used, e.g. tungsten carbide balls in a steel bowl or zirconium oxide balls in a silicon nitride bowl.