Union Process, Inc. recently produced a new S-Series Attritor specifically designed for cryogenic milling of aluminum powders. The S-50 has a special cover with a Teflon shaft seal for ultimate grinding results at low temperatures. It features a vent port for liquid nitrogen as well as ports for thermocouples. The S-50 is designed with a jacket around the exterior of the tank to maintain full vacuum at temperatures as low as -320°F. Featuring a gross tank volume of 81 gal and a media volume of 37 gal, the new unit is constructed with a 40-HP motor with variable frequency drive (VFD). Since the mill was required to be explosion-proof, the VFD is mounted outside the hazardous area.
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