Even the double glazing unit with standard argon filling achieves 1.1 W/m2K (Ug-value as per EN 673) at a light transmittance of 80 percent. A combination for excellent comfort. The higher thermal insulation of iplus E also reduces the energy consumption, which in view of increasing heating costs and the Energy Performance Certificate (as of 2006) is a major issue for house-builders.
The innovative low-E coating provides for exceptionally high light transmittance (tL = 80% as per EN 410). The glazing is thus particularly suitable for domestic construction where plenty of natural daylight is desired. It also remains neutral in colour (Ra = 97). With a solar factor of 60 percent, iplus E achieves passive solar energy gain.
Inside the glazing unit is the extremely thin iplus E coating, on the inside pane facing the gap between the two panes. It thereby is protected from external impact. It has a very low emissivity (therefore low-E or low emissivity coating) and reflects heat radiation almost completely into the building. The gap between the two glass panes is filled with an inert gas (usually argon).