Description
Device for grinding in liquid nitrogen
The grinding set is placed in a cryo-box to grind soft, oily, fatty or moist materials by adding liquid nitrogen to embrittle the grinding material. This method is used to reduce samples which are very difficult to grind (e. g. slivers of soft PVC) to analytical fineness. The thick insulation of the cryo-box keeps coolant costs low.
For cryogenic grinding, a mortar and a grinding ball made of stainless steel, hardened steel or hard metal tungsten carbide should be used.