Glass Tempering

Thermally Strengthened Glass TVG

by DUBIEL VITRUM SP. Z O.O.

View DUBIEL VITRUM SP. Z O.O. on TEKEN44

Thermally strengthened glass, also known as semi-tempered glass, is commonly used in construction. Similar to tempered ESG glass, it offers greater mechanical and thermal resistance compared to annealed float glass, albeit with lower strength than fully tempered ESG glass. A distinguishing feature is its characteristic crack pattern upon breakage: the glass breaks into larger pieces that radiate toward the edges, preventing the pane from falling out of the frame. In contrast, tempered glass shatters into small, blunt fragments. Thermally strengthened glass is denoted by the abbreviation TVG (from the German *Teilvorgespanntes Glas*). Thermal strengthening is a process similar to tempering but involves a slower cooling intensity. Air cooling induces compressive stresses, enhancing the glass's strength. The internal stresses generated during this process are relatively lower than those in tempered glass. Thermally strengthened glass ("semi-tempered") produced by Dubiel Vitrum is marked with a permanent CE symbol, confirming compliance with the PN-EN 1863 standard.