Repazole® PBI flow battery membrane for high-current-density flow battery stacks, combining low vanadium-ion permeability with high ionic conductivity at 25 μm.

Polybenzimidazole resin is a heterocyclic polymer containing aromatic and imidazole rings, with a glass transition temperature of up to 425 ℃. In addition to its unique high temperature resistance, it also has excellent resistance to strong acids, bases, and mechanical properties, making it the highest performing engineering plastic today.