Insulated Glass Unit (IGU) Testing

Just like the windows themselves, IGUs (Insulated Glass Units) are tested to insure that their hermetic seal does not become compromised causing it to fail prematurely. This is what causes condensation on the interior of the glass.

In addition to checking for the percentage of argon in the IGU, testing is comprised of three main parts:

  • High Humidity Phase: For a period of 14 days, the units are kept in an environment of 140 degrees F and 90-100% humidity.
  • Temperature Cycling Phase: The temperature alternates between -20 F and 140 F twice a day over a period of 63 days. In addition to high temperatures, during the “hot” cycle, the IGU is exposed to UV Light (Ultraviolet Light) which degrades the materials that hold the two pieces of glass together. A mist is also applied during the first hour of this cycle to add more environmental elements that degrade the IGU.
  • Frost Point: Once complete the windows are checked for “frost point” which determines whether the hermetic seal of the IGU has failed.


IGU Test Chamber at Architectural Testing, Inc.