Do Solar Guard window films cause seal failure when applied to double glazed windows?
No, window films do not cause seal failure. We’ve been applying Solar Guard films to double glazed windows for over 25 years with many million of square feet of film applied to date world wide. When recommended films are applied to the inside pane of a double glazed unit, there will be some absorption of the suns energy, which will increase the temperature of the glass pane. Some of this heat will transmit to the airspace, slightly raising the airspace temperature. However, even a 7C increase (unusual for most films) will result in a less than 3% change in air pressure, whereas properly made units are designed and tested to withstand 22% changes in air pressure. Risk of seal failure is greatly determined by the quality of workmanship and the quality of the materials that go into building the double glazed units. The best protection against seal failure is to purchase well made units from reputable window manufacturers that have solid experience with double glazed units.