XION™ Composite Aquivion™ Membranes are ultra-thin, highly conductive, and highly stable reinforced proton exchange membranes (PEM). The membrane is based on a perfluorosulfonic acid (PFSA) ionomer developed by Solvay. The Aquivion ionomer produced by Solvay has much shorter side chains than traditional Nafion, leading to much greater chemical stability. The reinforcement layer is a porous substrate integrated into the structure of the membrane to provide enhanced mechanical properties. The enhanced mechanical properties allow the Xion Composite Aquivion Membranes to be produced much thinner than free-standing membranes, resulting in higher ionic conductivity without sacrificing strength. Applications include fuel cells, electrolyzers, and sensors. XION™ Composite Aquivion™ Membranes come in two variations based on the equivalent weight (EW) of the ionomer: 720EW has higher ionic conductivity, but 830EW has greater stability.