Ultra-pure engineering plastics and elastomers are available for manufacturers of nonimplantable healthcare products and equipment. DuPont Engineering Polymers, Wilmington, Del, (www2.dupont.com/plastics), has launched 12 materials combining high purity with design freedom, performance, and cost benefits of molded or extruded plastics. Grades include nine Hytrels, a Delrin polyacetal with low-volatile emissions, a Zytel nylon with low-moisture absorption, and a Zenite liquid-crystal polymer (LCP) resin well-suited for protection of pharmaceuticals against oxygen and water vapor.