Toughened Glass

Glass toughening is the thermal process of heating the glass to 700-740 C˚ and rapidly cooling it down to room temperature – making the material 5 times harder without losing its elasticity.

A key element in reducing the likelihood of the glass breaking during the securing process is the careful machining of the glass edges. It is recognized that defective processing of the edge of the glass to be toughened affects both the quality and the mechanical properties of the finished product.

Tempered glass is used in glass walls, double glazing or laminated windows, etc. – especially for applications requiring the following:

Better resistance to mechanical shocks (glass doors, glass panels fixed at points such as glass railings, etc.).
Better resistance to thermal stress (glass subjected to intense sunlight or mounted near heat sources such as colored glass cladding, etc.).
Better protection against the risk of breakage, respectively reducing the risk of injury.

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The HEAT-SOAK Treatment for thermally toughened glass

However, there is still a risk of tempered glass, namely the risk of accidental or spontaneous breakage of the glass without being subjected to external shocks.

This risk can be eliminated by a test called HEAT-SOAK TREATMENT. The nickel sulfide inclusions normally contained in any glass increase their volume in the presence of high temperatures. The balance of stresses inside the tempered glass changes in these places and so-called spontaneous breakages occur.

To minimize this risk, it is recommended – in the case of glass with applications with an increased potential for danger to people – additional treatment through the ‘heat soak’ test.

Thus, after securing the glass, it is placed in the oven and kept at a constant average temperature of approx. 290 degrees C for 4-8 hours, during which time the glass at risk breaks.

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State-of-the-art technology

In order to obtain quality products, Transparent Design invests in modern machinery, produced by renowned professionals in the field.

Currently, we have three security lines in production, which benefit from a state-of-the-art technology for uniform and controlled heating of the glass, namely a high-performance ‘full convection’ system, which is reflected both in the quality of the security glass (flatness and no stains), and in productivity.

LANDGLASS ULTRAJET A326OU – 6000 X 3300 MM & 5-19 MM (2021)
LANDGLASS ULTRAJET PLUS BOTTOM SUPERAIR – 5000 X 2400 MM & 3.2 - 19 MM, MIN. DIM. 150X300MM (mai 2022)
LANDGLASS ULTRAJET LD-A3050U – 5000 X 3000 MM & 5-19 MM (feb 2024)

We are going to add 2 automated bending modules for the existing tempering furnaces and a tempering and bending line (convex and concave) for glass with dimensions of max. 9000x3210mm.
These new machines will allow us to increase the daily (8 hours) tempering capacity up to 1600 sqm and expand our product portfolio by supplying tempered curved glass. We will thus cover a diverse range of bending radii (both concave and convex), thanks to modern machines with computer control and programming.

The security technology complies with the European standards EN 12150 and EN 1863 which ensure the processing of float glass with thicknesses between 4 and 19 mm, respectively of special glass with film (Low-E and reflective).

In May 2020, Transparent Design received the BSI Kitemark™ BS EN 12150 certification.