Union Process, Inc. recently produced a special Q-6 Circulation Attritor for a start-up orthopedic medical company. To ensure a metal-free environment as required by this customer’s application, the Attritor was constructed with an 8.5-gal, polyurethane-lined grinding tank and a plastic-coated agitator shaft with polyurethane-coated agitator arms. The upper discharge chamber was constructed of Halar-coated stainless steel. Q-Series mills from Union Process are high-circulation, high-flow mills, which produce a faster grind and narrower particle size distribution. During the circulation process, the material makes multiple passes through the grinding chamber until the desired particle size is obtained. This means that Q-Series mills can process a large batch of slurry using a smaller mill, which requires less grinding media.