Whatman® 6874-1302 Syringe Filter, GD/X 13mm, 0.2um, PTFE, pack/150 Description Syringe Filter, GD/X 13mm, Non-Sterile, 0.2um Pore Size, Polytetrafluoroethylene (PTFE). A comprehensive range of disposable syringe filter devices designed to provide fast and efficient filtration of aqueous and organic solutions.