The Whatman 5ml sterile Centrex centrifuge tube filter provides the ability to process rapid and simple preparation of a large number of samples. More than six samples can be processed at once. Ideal for automated systems and high-speed batch filtration with robots. They also provide considerably reduced contamination risk when working with radioactive or biologically hazardous materials. Cross contamination is easily avoided with Centrex brand centrifuge filters. Sterile. 50/Pack. Whatman #: 10467021.