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DuPont™ Teflon® film is a substitute for glass in the lamination process to produce flexible photovoltaic systems. Teflon®, which is used as the top layer of the module, brings a very high level of light transmittance in the operating frequency range of the solar cells. It is lighter and less fragile than glass and shows very little degradation over a long period of time. It also offers excellent mechanical strength and reliability.