Available from this company, the HNP 11558 micro annular gear pump features the toughest, most chemically resistant materials for its key components, as well as magnetic coupling for leak-free pumping. For example, ceramics are used for bearings and shafts, the rotors are made of zirconium oxide, and alloy C22 is used for case components. The HNP 11558 is designed to deliver smooth, precise pulseless flows at high differential pressures up to 60 bars, and is suitable for critical fluids-handling applications. The 12-kg pump delivers flowrates from 0.19 to 1,152 mL/min. — Michael Smith Engineers, Woking, U.K.