Fluoropore Membrane Filter 1.0 µm pore size, hydrophobic PTFE, 37 mm membrane; find Millipore-FALP03700 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich Our Fluoropore ® membrane is a hydrophobic, polytetrafluoroethylene (PTFE) polymer membrane bonded to a high density polyethylene support to improve the handling characteristics of the filter