Heat-treated glass is used in many of today's architectural glazing applications where increased strength to resist glass breakage is desired. The process of heat-treating glass involves uniformly heating glass close to its softening temperature and then rapidly, and uniformly, cooling it. This Paper gives guidelines for producing heat-treated glass. Guidelines should be regarded as a general starting point, but for more detail consult your vendors and equipment manufacturers.

The Technical Services Division of the National Glass Association (NGA) has produced this Glass Technical Paper solely for informational purposes. This Paper was developed by dedicated member volunteers and subject matter experts. The original version of this document was approved and published in 2017. This version of the document was updated and published in April 2022. All purchases will be electronically accessed or delivered.