Sample preparation
Ball mills
Planetary grinding mills have long been part of Fritsch’s range. Since the 1980s, this technology has replaced outdated grinding techniques such as mortar mills, centrifugal ball mills and disc vibrating mills. The high efficiency, ease of operation, grinding speed and the final fineness to be achieved are the major advantages of these machines. The material of the grinding jars and grinding balls is chosen according to the hardness of the material to be ground, desired final fineness and requirements in terms of contamination by the grinding assembly. Cups with a volume of 20 ml to 500 ml are available in combination with grinding balls with diameters ranging from 0.1 mm to 40 mm (depending on the device and material). Grinding sets (cups + balls) are available in agate, sintered corundum, silicon nitride, zirconium oxide, hardened stainless steel and tungsten carbide. Accessories for grinding under inert gases or at controlled temperature and pressure are also available.
Pulverisette 7 premium
The Fritsch Pulverisette 7 premium is the first planetary mill specifically for grinding in the nanometre or submicron range. Due to the extreme grinding conditions that can be applied (speed of up to 1100 rpm and accelerations of up to 95 g), exceptional attention was paid to safety and ease of use during development, including automatic recognition of grinding jars, stabilisation detection, control via bluetooth or from PC, automatic closure of the grinding chamber, etc… This makes it possible to carry out grindings below the 100 nm limit. This device is therefore rightly known in the market as “nanomill”.
Pulverisette 5 premium
The Fritsch Pulverisette 5 premium line was developed as the big brother of the pulverisette 7 premium line for rapid wet and dry grinding, mechanical synthesis, mixing and homogenisation of larger sample quantities in the nano range. With double motor power (2.2 kW) and a new clamping system for the grinding jars, this mill is even safer and easier to use.
Pulverisette 7
The Pulverisette 7 classic line features 2 positions with grinding cups of 12 or 45 ml. With an effective sample volume of 2×0.5 ml to 2×20 ml and a speed of up to 800 rpm, this mill is particularly suitable for dry and wet grinding of small sample volumes down to a final fineness < 1 µm.
Pulverisette 6
The Pulverisette 6 classic line is a planetary ball mill with 1 grinding position. A grinding cup of 500 ml or 250 ml can be placed in it. It is also possible to use two 80 ml grinding jars to reduce 2 different samples at the same time. These grinding jars give an effective sample volume of 10 to 225 ml.
Micro ball mill
Micro-ball mills are used for grinding small sample quantities (typically 1 ml to 10 ml) to a fineness of 10-15 µm.
Pulverisette 23
This device is used for grinding very small amounts of material. The final fineness to be achieved is 10µm. In this grinding mill, the cup, balls and material are oscillated vertically at frequencies of 900 to 3000 Hz. This device is often used for grinding “forensic” materials or other applications where a very limited amount of material is available.
Pulverisette 0
The Pulverisette 0 grinds volumes up to 10 ml to a final fineness of 5 µm to 10 µm. The result is a homogeneous material that is very useful for XRF analyses because the particle size distribution is very narrow. This device is also very suitable for applications where small quantities need to be ground. The simple operation and the possibility of using the unit as a sieving machine make this Pulverisette 0 a good choice. For cryogenic grinding, this mill can be equipped with a “cryobox” filled with liquid nitrogen.