Pack of 50 Hydrophilic PTFE 0.22um 47mm Membrane Filter; Hydrophilic PTFE, Membrane Filter, 3, : Science Lab Filter Membranes: Industrial & Scientific, Membrane Filter, 22um, Very Broad Chemical Compatibility, : Science Lab Filter Membranes: Industrial & Scientific, B, Hydrophilic PTFE, corrosive and oxidizing solutions and other aqeuous solutions. 47mm, Applications: Filtration for organic