Retsch has launched its latest range of knife mill accessories designed for cryogenic grinding applications.
The Grindomix knife mills are used for the rapid and reproducible size reduction and homogenisation of dry as well as moist, oily or fatty sample materials.
For samples containing volatile or degradable substances, grinding with dry ice is recommendable as the sample is therefore embrittled and the volatile components are preserved.
Cooling the sample is, for example, part of the sample preparation process for pesticide residue analysis according to the QuEChERS method which is practiced in many food laboratories.
To optimise processing under dry ice, or after previous external cooling of the sample with liquid nitrogen, Retsch offers special accessories for cryogenic applications.
A stainless steel knife, a grinding container made of stainless steel and a special lid for dry ice applications, containing a small aperture for the escape of overpressure, are all designed for cryogenic sample preparation.
The Grindomix GM 300 is ideally suited to process up to 4500ml of sample material and provides representative grinding results within seconds.
A wide selection of accessories makes the GM 300 a versatile tool for sample homogenisation. To grind smaller sample volumes up to 700 ml, Retsch also offers the Grindomix GM 200 which can also be used for dry ice applications.
