Heat Soak Test – HST
Tempered glass manufactured by PRESS GLASS ranks among the very top quality products. It complies with PN-EN 12150-1 standard 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 toughening, nickel sulfide impurities in the glass pane increase their volume; when the heated glass is rapidly quenched
How does the Heat Soak Test (HST) work with toughened glass?
Understanding the mechanism of spontaneous nickel sulfide failures helped develop a method to eliminate panes likely to suffer breakage: Heat Soak Test, or HST.
Why should you ask for HST toughened glass?
There is a growing tendency to require glass used for large projects be HST tested. Regulations become more stringent and investors better aware of 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 HST to the full range of our toughened glass products. We use an HST oven calibrated by IFT Institute of Rosenheim to perform HST testing. Test results confirm the heating process conforms to PN-EN 14179-1 standard “Heat-Soaked Thermally Toughened Soda Line Silicate Safety Glass”.
Toughened glass produces by other companies – only HST by PRESS GLASS
of longer side 400 mm