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Performance

• Heat-strengthened glass:
  • is more resistant to thermal stress than annealed glass. It can withstand differences in temperature of approximately 100°C
  • more resistant to breakage due to bending (70 N/mm²) than annealed glass
  • breaks into large sharp pieces which can cause injury

  Accordingly, heat-strengthened glasses are not safety glasses. Heat-strengthened glasses break in a crazed pattern.

• Magnetron coatings which can be thermally treated must be heat strengthened to achieve the stated performance (fragmentation, optical, Ug value)
• The light, thermal and energy performance of thermally toughened glasses is exactly the same as that of the same annealed glass.

Finishing

• Edge finishing

  The following edge finishings are available for heat-strengthened glasses:

  • Arrissed edges
  • Ground edges but some bright areas permitted
  • Ground edges but – no bright areas
  • Polished edges

  For buildings, the heat-strengthened glass will be supplied as standard with arrissed edges but depending on the requirements of the particular application, a different finish may be possible. Ground polished edges are normally only destined for nonbuilding applications.

• Other finishing options
  • Holes
  • Notches