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Mills designed for grinding at a very low (i.e., cryogenic) temperature, usually below -180 degrees C (-292 degrees F). These mills typically consist of an electrically powered device in which the grinding container is continuously cooled with a liquefied gas (e.g., nitrogen); the liquid nitrogen circulates from a cooling system that keeps the material being ground at an appropriate, stable cryogenic temperature. Cryogenic mills are used in healthcare facilities to grind a variety of laboratory and/or pharmaceutical products (e.g., chemicals, tablets, tissue) keeping the volatile components intact; they may be also used to grind small quantities of bone for dental and/or orthopedic use.
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