Glass is naturally fragile. Thanks to the toughening process, the internal stresses within its structure change, which results in an increase in its bending strength. Toughened glass means safety.
When it breaks, the pane is shattered into tiny pieces with blunt edges.

• bending strength is five times higher in comparison with non-toughened glass,
• resistance to thermal shock and heating caused by solar radiation,
• decreased risk of injury when the pane is broken.

Directional hardening

An inseparable component of the toughening process is the so-called glass waviness.
Press-Glas informs all customers that this effect can occur, in order to be fair in service.
The waviness effect is of particular importance if glass panes are assembled in building
facades, especially with big glazed surfaces. It is visualised by a distortion of the view
reflected in the facade. To decrease the distortion ef-fect of a reflected picture,
it is suggested that directional toughening is made. It means that e.g. in the case of
toughening along the height, waviness will occur perpendicularly to this dimension.

Semi-toughened glass

Semi-toughened glass differs from the toughened glass by the kind of breaking netting,
which occurs during glass panel damage. Due to its breaking characteristic, the panel assembled
in the frame stays there after the damage, which protects against injury. Thanks to this feature,
TVG is starting to become interesting as an alternative for toughened. However, semi-toughened glass
is not counted among the types of safety glass.

Heat Soak Test 
 

Market offer

• in the shape of single formats or double and triple glazing,
• with holes and cuttings,
• with chamfered, ground or pol-ished edges;
• in triangular, rectangular and polygonal shapes, arcs and circles;
• covered with silicon coatings and enamelled,
• silk screen printed.