PTFE Laminated Membrane Filters, 0.20 micron, 47 mm, pack of 00. Hydrophobic, durable ePTFE laminated on to a polypropylene later. Ideal for venting, phase seperations, and aerosol sampling. SKU. Ptfe Filter Holder at Thomas Scientific 47mm filter diameter Available in type 304ss or 36ss Filter liquids or gases at point-of-use This 47mm in-line