Omnipore Membrane Filter 0.45 um pore size, Hydrophilic PTFE membrane, 13 mm diameter; find Millipore-JHWP01300 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