Tempering Glass Process
Veneto Vetro is equipped with a high-performance full-convection tempering oven, ideal for tempering new generation, selective, low emission glass that can be tempered with very low remission.
The flat glass is laid on a roller table where it slides into the oven that heats it to the tempering temperature of approx. 640 °C, after which it is rapidly cooled by air jets. This process cools the surface layers and hardens them, while the inner layer remains hot longer. As the centre layer cools down, it generates a compression force on the surface that is balanced by the relaxing tension inside.
Tempered glass is about six times tougher than float glass, because the surface faults are “closed” by the mechanical compression tension, and the inner layer has fewer faults that could generate cracks.
Given its greater strength, tempered glass is often used to build components without a bearing structure (all glass), like glass doors and structural applications.
It is also considered a “safety glass” because, besides being stronger, it tends to break in very small rounded fragments that are not dangerous. Consequently, this type of glass is ideal for sliding doors, main entrance doors to buildings, bathrooms and showers, internal partitions and all those uses where high-strength glass is required.
The processing and features of tempered glass are subject to the UNI EN 12150 standard, while the UNI EN 7697 standard governs the safety criteria for glass applications.
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