Pore Size: 0, liquids, The PTFEmembrane filter is an excellent choice for use with aggressive solvents. 50/Pack, PTFE Membrane filter is an excellent choice for use with aggressive solvents, and solvents, 45 Micron, The membrane is laminated onto a non-woven polypropylene support web for improved strength and handling. and solvents, 45µm, 45