HSG-GUARD® is thermally pre-stressed in the same way as G-GUARD®, but the cooling process is much slower. As a consequence, slight stress differences are generated in the glass, unlike G-GUARD®, and its bending strength ranges between the strength of G-GUARD® and that of float glass.
HSG–GUARD® is used for glazing where a high resistance to temperature changes is required, due to a high degree of solar radiation or due to the formation of deep shadows. This type of glass is distinguished by its characteristic fracture, with cracks that penetrate radically from the fracture center to the edges of the pane.

Due to its fracture behavior, HSG-GUARD®, in contrast to G-GUARD®, is used as basic glass for laminated safety glass and has a very high degree of residual load-bearing capacity. Only a slight bending will be observed upon fracture of a laminated pane made of 2 x HSG-GUARD®. Sagging of the pane is prevented thanks to the favorable fracture pattern.
Αnother big advantage of HSG-GUARD® is its flatness compared to a fully-toughened glass, which traditionally has local distortions, formed during relocation of glass by the rolls used during hardening in the furnace. This is mainly the reason that it is preferred over G-GUARD® on facades.




σ= 70MPa


Resistance to failure due to temperature differences in the pane surface (between the centre and the edge of the pane) is ensured up to 43°C.