Why do insulating glass unit seals break?
The environment inside an insulating glass unit can be affected by its external environment such as temperature and air pressure. Changes in temperature and air pressure put additional stress on the insulating glass unit’s seals. The use of resilient sealants in the construction of the insulating glass unit can also cause the seals to fail. Most manufacturers, however, design and test their products to withstand significant changes in air pressure and temperature, thereby reducing the chance of failures. Nevertheless, seal failure does will continue to occur simply because of the way in which insulated units are manufactured, shipped and installed. In fact, the insulating glass manufacturers association (SIGMA) has found normal seal failure to be at a rate of 1.5% of the installed units.
