Fraunhofer IBP makes improvements to ETFE material

Researchers at the Fraunhofer Institute for Building Physics (IBP) have developed new ways to process ethylene tetraflourethylene (ETFE), which will give architects entirely new design options.

So far the material has been reserved for specialist, one-off architectural experiments, such as the Eden Project, Water Cube and the Allianz Arena in Munich.

But improvements in the material, which will allow it to regulate heat, coolness and light could see it used routinely in construction.

Robert Hodann, chief executive at film manufacturer Nowofol and industrial partner of the research project, said: ‘We believe that ETFE will emerge as a strong market of its own. The captivating thing about ETFE foil is its transparency combined with its great strength - no other plastic membrane can compete.’

What the IBP engineers have managed to do is to add various coating layers to ETFE, which change the properties of the material.

One example is an inner coating of tungsten trioxide, which turns blue as it comes into contact with hydrogen and loses its colour with oxygen - allowing the passage of light to be easily regulated.