Plastic sheeting, as used in architecture today, allows the creation of building skins that are unsurpassed in their permeability to light and UV radiation. The fluoropolymer material ethylene-tetrafluoroethylene (ETFE) has proved most effective in this context. Its extremely low weight (350g/m2 for a thickness of 200µm), its high permeability to light, its great chemical resistance to acids and alkalis, its relatively long life (more than 20 years without significant changes in its mechanical and optical properties) and its almost complete recyclability make fluoropolymer sheeting a most valuable and economical building material. (Karsten Moritz, Rainer Barthel)