During all those discussions about the third position after the decimal point of Psi-values, sometimes I miss other important aspects of insulating glass, like for example the durability of the edge bond. World’s best warm edge system would be worth nothing, if it allows for the gas fill to leak from the gap between the panes, because this worsens the Ug-value. Or if the unit fails untimely, because humidity can get into the gap and condensate on the inner glass surfaces. In my latest article for the magazin GLASWELT, I explain what is important for the processing of warm edge spacer systems and for the quality of insulating glass units. You can read the article in German language here.