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.

Step 01: Select Glazing

Step 02: Exterior Glass

Step 03: Interior Glass

Step 04: Location

Step 05: Frame Parameters

Results Options

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Open in SMC

Open in SMC

Open this project in the Pilkington Sun Management Calculator

Select Glazing

Please select one of the following:

Single Glazing

Double Glazing

Air Fill

Double Glazing

Argon Fill

      Step 4: Location/Environment

      mountains inland coastal
      • Mountains

        Includes all areas with altitude above 3,000 feet.

      • Inland

        Over 100 miles from the sea coast and up to an altitude of 3,000 feet.

      • Coastal

        Includes the area from the sea coast to 100 miles in-land and below 3,000 feet. It does NOT include the U.S. Great Lakes shores, which are counted as Inland.

      Not Selected

      Roll over locations to view details.
      Click to select.

      Outboard Light



      Product Name




      Inboard Light



      Product Name




      • Fill:
      • Location:
      • Horizontal Mullion Overhang:
      • Vertical Mullion Depth:
      • Frame Color:

      Percent of allowable thermal stress load for annealed glass.

      These results are estimates for steady state heat flow conditions and may not accurately represent actual situations. Please click here for further information.

      Non-Typical Construction

      This glass and coating combination not calculated because it is not realistic.
      Call NSG at 419-247-4448 for further assistance


      • Glass Parameters

      • Rsol 1:
      • Rsol 2:
      • Emis 1:
      • Emis 2:
      • Rvis 1:
      • Rvis 2:

      This is a non-typical construction.

      Try flipping one or both lights.

      Contact ATS: (419) 247-4448
      Click here to e-mail ATS.

      E-mail Thermal Stress Calculator Results

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      (separate multiple addresses with a comma).

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      Open Project From SMC

      You have opened this project via the Sun Management Calculator. Some further information is required to make the final Thermal Stress Calculation:

      • Location
      • Mullions Parameters

      Click here to make these selections.

      Cannot Open in SMC

      Sorry, it is not possible to open this project in the Sun Management Calculator.

      Possible reasons:

      • Selected Glasses are not Pilkington North America products
      • The widths of the selected lights are not equal