PTFE Laminated Membrane Filters, 1.0 Micron, 13mm, 100/Pk. PTFE Laminated Membrane Filters, 1 micron, 13 mm, pack of 100. Hydrophobic, durable ePTFE laminated on to a polypropylene later. Ideal for venting, phase seperations, and aerosol sampling. SKU.