Heat Soak Test

The HST provides additional safety. By testing the already tempered glass we prevent the risk of breakage when already installed.

Toughened glass is heated up to approximately 290 ⁰C for a period of time specified in the applicable standard. Close to 99% glass panes with inclusions will be identified and suffer fracture.

There is a growing tendency to require glass used for large projects be HST tested. In case of a fracture the glass panes must be promptly replaced, a very costly procedure often calling for a lifting crane or other specialized equipment.