Toughened glass can sometimes spontaneously break; the reasons can be many. Nickel sulphide inclusions in the glass are initially implicated. Hidden inclusions in the glass can be activated during the heating process in thermally tempered or fully tempered glass.
Once activated these inclusions become unstable and can cause the glass to break at any time sometimes months or even years after installation. These inclusions although very rare can cause disruption and costs for replacement and therefore ToughGlaze will always recommend all toughened glass to be heat soak tested to reduce the risk of this happening.
Testing method EN 14179-1
After toughening the individual glass panels are positioned on special racks and placed inside a calibrated oven. The glass is then heated for two hours and stabilised at 280 - 300 C. This temperature is maintained for a further three hours and then allowed to cool for two hours.
Any breakages at this stage are replaced and the sequence starts again. Although this test simulates actual glazing conditions other breakages can still occur.
Maximum Sizes: 2600mm x 4300mm
Thickness Range: 4mm – 19mm
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