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Introducing the Antlia™ pneumatic hand pump system. Applies needed pressure to membrane filtration problems. Give your nitration problems a shot in the membrane with the new Antlia pneumatic hand pump system. It's designed to provide needed pressure for fluids with high viscosity. Fluids with large concentrations of particles. And for filtering through membranes with pore sizes as small as O.Ol^m. Insert a new membrane, glass, or paper filter in either its 25mm or 47mm thread-on holder, and the Antlia pump instantly adapts to a new application. Sterile filtra- tion, clarification. On-the-spot testing of membrane per- formance. And a host of others. A pump within a pump makes it all possible. The Antlia unit consists of two concentric polycarbonate cyl- inders. The outer cylinder holds up to 50ml of solution. The inner one functions like a bicycle pump. Sliding on silicone O-rings, it exerts air pressures as high as 115 + psi. Safety valves relieve over-pressurization. Compo- nents are stable at temperatures up to 130°C, can be autoclaved, and are chemically resistant. An accessory three-way valve permits filtration of large volumes by allowing the user to draw fluids up into the cylinder and discharge them through the filter without having to disassemble the unit each time. Selectron® membranes, as well as S&S glass and paper filters for the Antlia system, come in diameters of 25 and 47mm. And in a wide range of pore sizes. For details, send for our new Instructional Bulletin, S-4, 'The Antlia Pneumatic Hand Pump System.' We'll also send you our complete catalog of materials and equipment for separation science. SCHLEICHER & SCHUELL Keene, New Hampshire 03431 Schleicher and Schuell GmbH, D-33S4, Dassel, West Germany Schleicher & Schuell AG, 8714 Feldbach ZH, Switzerland CIRCLE 193 O N READER SERVICE CARD 940 A · ANALYTICAL CHEMISTRY, VOL. 48, NO. 12, OCTOBER 1976
