Glass Tempering

Tempering or toughening is a process where the glass is heated at high temperatures to make it stronger and more resistant to breakage

Glass Tempering

A process in which glass is subjected to extemely high temperature to increase surface strength. Tempering puts the outer surfaces to compression and the inner surfaces to tension. Glass is subjected and exposed to about 1,200 degree farenheit, then rapidly cooled down.

Tempered glass is about four to five times stronger than “ordinary” or annealed, glass. Tempered glass fructures into small and relatively less harmful pieces unlike ordinary glass that shatters into jagged shards when broken.

To prepare glass for the tempering process, it must first be cut to the desired size, edge polished and holes drilled where required and any other pre-process as needed. (Strength reductions or product failure can occur if any  additional glass process takes place after heat treatment.) The glass is then thoroughly examined for imperfections that could cause breakage during tempering.


Aside from aesthetics, tempered glass is used in those environments where human safety is of utmost concern.

Some common applications are;

  • Glass facade
  • Entrance doors
  • Enclosures
  • Racquetball courts,
  • Glass staircase
  • Pool fencing glass
  • Skylight


The most important benefit of glass tempering or heat strengthening are improved overall strength and safety.

Main advantages are;

  • Safety – glass shatters into relatively smaller pieces when broken  by pressure reducing serious injuries caused by accidents.
  • Edge Strength – edges of tempered glass are cmpartively strong compared to normal ordinary “annealed glass”
  • Thermal Breakage – highly resistant to thermal breakage withstanding temperature changes up to 250 °C



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