Vacuum Insulation Glass (VIG)
VIG is a double glazing with a vacuum between the panes of glass. This means
that slim systems less than 10 mm thick can be realized with heat transfer
coefficients of U ≈ 0.5 W/(m²K). Triple glazing, used,
for instance, in passive houses, achieves a typical U-value of 0.6 - 0.7
W/(m²K) at a thickness of 28 - 44 mm, but is 50 % heavier.
VIG with a U-value of ≈ 0,5 W/(m²K) is not yet available on
the market. Production techniques for such systems are currently being developed
within the framework of a BMWi-funded project
The results will be available in 2012. Click on the above links for more information.