How tempering glass

Tempered glass can be a challenge. It requires heating the glass to a very high temperature and then let it cool quickly. This alters the molecular composition thereof so that it becomes six times harder than normal glass, but also more fragile. An advantage of tempered glass (plus extra hardness) is that if it breaks it does in insurance rather than sharp and potentially dangerous fragments pieces.


  1. Molded or drilled some holes in the glass before tempering; once it is tempered cannot be cut or drilled without breaking into small pieces in miniature.
  2. Heat tempered glass you want at not less than 600 degrees Fahrenheit (315 ° C) in a furnace or oven temperature.
  3. Remove the glass from the oven or stove (carefully, using tweezers or a special palette for handling glass), place it on a surface of concrete or brick and let it cool quickly fanning fresh air (not cold). This rapid cooling of the outer surface of the glass causes molecular changes. Let the glass cool completely.
  4. Controls whether the glass has been properly tempered at him with a polarized lenses and illuminating through. Tempered glass designs have shadows (sometimes called “off brands”) visible with polarized lenses.

Tips & Warnings:

  • Tempered glass is broken occasionally spontaneously due to internal stress of the annealing process.
  • Be careful when handling tempered glass because it is easier than normal glass breaks.
  • Do not release or tempered glass hit.
  • Always wear safety glasses and heavy gloves when working with hot glass.