The Pilkington Thermal Stress Calculator computes general guidelines as to which glass combinations and glazing details may need heat treatment to prevent thermal stress breakage from direct solar radiation. The program evaluates single and double-glazed Pilkington products, and double-glazed units with one light of Pilkington manufacture and the other from the LBNL IGDB Version 26 Library. Note: many combinations may not be practical in service, such as when exposing soft, sputtered low-e coatings to ambient air.

It is the program user’s responsibility to ensure that the glass combinations chosen are practical and appropriate.