Die bautechnischen Vorteile der Folie aus Ethylen-Tetrafluorethylen-Copolymere (ETFE- Folie) haben das innovative Material in den letzten Jahren zu einem attraktiven Baustoff gemacht. Diese Folien werden aus einem äußerst stabilen Fluorpolymer – Kunststoff hergestellt. Es ist eine fluorierte Folie und weist ein geringes Eigengewicht sowie eine hohe Licht- und UV- Durchlässigkeit auf.

http://www.kfm-membranen.de/index.php?option=com_content&vie...

ETFE stands for Ethylene Tetrafluoroethylene, a transparent polymer that is used instead of glass and plastic in some modern buildings.

http://architecture.about.com/od/construction/g/ETFE.htm

ETFE FOIL
High grade films for air-supported roof or facade modules, double or multi-layer system for insulation, self-cleaning, lowest fire load, self-extinguishing, hail-resistant, clear or white, limited colour possibilities, light transmission up to 90 %, life expectancy over 20 years.
http://www.archiexpo.com/prod/hightex/translucent-etfe-membr...

Compared to glass, ETFE film is 1% the weight, transmits more light and costs 24% to 70% less to install. It's also resilient (able to bear 400 times its own weight, self-cleaning (due to its nonstick surface) and recyclable. On the other hand it is prone to punctures by sharp edges, therefore it is mostly used for roofs.[2] In sheet form as commonly employed for architecture, it is able to stretch to three times its length without loss of elasticity. Employing heat welding, tears can be repaired with a patch or multiple sheets assembled into larger panels.
http://en.wikipedia.org/wiki/ETFE