Currently, the most used material for their manufacture is a very expensive perfluorinated polymer called "Nafion", developed by the American firm DuPont de Nemours (Delaware).
Am Moment ass den am meeschte benotzten Material fir hir Fabrik e ganz teche perfluorinéierte Polymer, genannt "Nafion", deen vun der amerikanescher Firma DuPont de Nemours (Delaware) entwéckelt gouf.