Overview. Fluoropore™ Membrane is a hydrophobic, polytetrafluoroethylene (PTFE) polymer membrane bonded to a high density polyethylene support. (Catalogue numbers containing ""FHUP"" have no backing.) Fluoropore™ Membranes provide broad chemical compatibility, high flow rates and consistency. Omnipore™ Membrane is hydrophilic PTFE compatible with virually all solvents, acids, and alkaline solutions.