Modern insulating glass units with warm edge
To achieve high thermal performance, multi-pane insulating glass units are used in windows as a rule. At the glass edge, spacer bars maintain the distance between the panes. The spacer bar thus defines the width of the so-called cavity between the panes. This is frequently filled with noble gas, in order to further improve the energy efficiency of the insulating glass unit.
If this spacer bar is made from materials with a low thermal conductivity, it is referred to as a warm edge. The warm edge is therefore optimised in terms of its thermal insulation, in order to minimise heat loss across the edge of double or triple glazing.