Partially toughened glass
Partially toughened glass , TVG for short (regulated in DIN EN 1863-1) , like fully toughened toughened safety glass (ESG), is subjected to a thermal toughening process. However, the cooling process takes place more slowly. This results in lower tension differences in the glass between the core and the surfaces. The flexural strength of 70 N / mm² lies between that of float glass 45 N / mm² (according to EN 572) and toughened safety glass 120 N / mm² (according to DIN EN 12150). Furthermore, TVG with 100 K has a higher thermal shock resistance than float glass with approx. 40 K (according to EN 572). In the event of breakage, cracks occur that run radially from the center of the break to the edge of the pane, similar to the breakage of float glass. In practice, TVG is used almost exclusively for the manufacture of laminated safety glass. Due to the large-format fragments, LSG made of TVG has a high residual load-bearing capacity. That is why LSG made from TVG is mainly used for overhead glazing and fall-proof glazing .
literature
- Siebert, Maniatis: Structural components made of glass . Ernst and Son Verlag 2012.
- Weller, Nicklisch, Thieme: Glass construction practice, construction and dimensioning . Publishing house Bauwerk, Weimar 2010.
- Feldmann, Kasper, Langosch: Glass for load-bearing components . Werner Verlag 2012.