Polymer Electrolyte Membrane(PEM) is a key component of the MEA in the Hydrogen Fuel Cell. It prevents Hydrogen at the anode from meeting Oxygen at the cathode directly. Only Hydrogen ions, generated in the anode, can pass through the PEM. Through the MEA, Hydrogen Gas turns into Hydrogen ions, generating electricity eventually. GreenMem from Sang-A Frontec is reinforced with self-manufactured ePTFE. It shows superior mechanical strength, low dimensional change rate, high dimensional stability, and by using a fluorine-based ion conductor, excellent chemical resistance is achieved.