27/5/2020 · Porex and Oxyphen offer PFOA-free membranes. The Porex Virtek PTFE helps provide sufficient airflow while protecting devices from dust and moisture. To address ongoing concerns around potentially harmful perfluorooctanoic acid (PFOA) and PFOA-related compounds, Porex, a specialist in porous polymer solutions, is offering Virtek PTFE, a 100% pure