VERIFICATION OF HARDENED GLASS BY HEAT SOAK TEST
The heat soak test or heat soak process is used to minimize the risk of spontaneous breakages of heat-treated glass caused by nickel sulfide inclusions. In this process, glass channels are placed inside a chamber and subjected to an oven temperature of 550°F (287°C) to accelerate nickel sulfide expansion. This causes glasses containing nickel sulfide inclusions to break in the heat soak chamber, thus reducing the risk of potential field breakages. The full heat soak process involves testing all glass in the order, virtually eliminating any chance of nickel sulfide breakage.
Why should you ask for HST toughened glass?
The trend requires glass used for large projects to be HST tested. The rules are becoming stricter and investors are aware of the potential consequences of spontaneous breakage of already installed glazing systems. The windows need to be replaced immediately, a very expensive procedure, often requiring a crane or other specialized equipment.