Tempered glass manufactured by PRESS GLASS ranks among the very top quality products. It complies with official standards regarding strength, fracture pattern, dimensions and tolerances as well as edge finish. Test results prove our product exceeds strength parameters stipulated in the standard. Nevertheless, this state-of-the-art product shows a certain weakness characteristic of float glass: tiny nickel sulfide crystals (NiS) which may occur in molten glass during float glass production process. When glass is heated during tempering, nickel sulfide impurities in the glass pane increase their volume. When the heated glass is rapidly quenched
How does the Heat Soaking work with tempered glass?
Understanding the mechanism of spontaneous nickel sulfide failures helped develop a method to eliminate panes likely to suffer breakage: Heat soaked tempered glass is heated up
Why should you ask for heat soaked tempered glass?
There is a growing tendency to require glass used for large projects be heat soaking tested. Regulations have become more stringent and investors are more aware of the potential consequences caused by spontaneous fractures of already installed glazing systems. Fractured glass panes must be promptly replaced, a very costly procedure often calling for a lifting crane or other specialized equipment.
PRESS GLASS has applied heat soaking to the full range of our tempered glass products. We use an heat soaking oven calibrated by IFT Institute of Rosenheim to perform heat soaking.
The heating process for a heat soak test does not impair the safety class or strength of tempered glass. Customers who order heat soaking get high quality tempered glass checked for spontaneous fracturing caused by nickel sulfide inclusions.