Advantec ptfe 0.2 micron filter for metals PTFE Unlaminated Membrane Filters, Hydrophilic, 0.2 Micron PTFE Unlaminated Membrane Filters, Hydrophilic, 0.2 Micron, 25mm, 100/Pk (H020A025A) Durable, efficient, and broadly compatible, these pure, hydrophilic PTFE membranes are ideal for use with HPLC seperations, aqueous/organic solvents, and many of your other filtration needs.