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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, tempered steel or hard metal tungsten carbide should be used.
Please note: Grinding sets made of agate and sintered corundum cannot be used in the cryo-box.