Sterile Centrifuge filter units for sample volumes of no more than 0.5 or 2.0 ml. For use in fixed-angle rotors for 1.5 or 15 ml sample tubes. Filter unit and collector tube are made of PP. Hydrophilic Durapore ® PVDF-membrane: extremely low protein binding. Suitable for removal of particulate matter and precipitate from aqueous samples, and for protein and nucleic acid applications Hydrophilic PTFE membrane: for removal of precipitate from solvent-based samples Procedure: Open the attached lid of the filter unit Fill the insert with the volume of sample Close the filtration unit and insert it in the centrifuge On completion of centrifuging, remove the filtration unit, open the lid and remove the insert The insert contains the residue and the sealable housing contains the filtrate Centrifuge filter unit Ultrafree Ultrafree-MC: PVDF membrane, sample volume up to 0.5 ml Filter insert volume max. 0.5 ml, collector tube volume 1.5 ml.