Glass type
Heat-strengthened glass
Glass heated and cooled more gently than toughened glass: about twice as strong as ordinary glass, and when it breaks the cracks run to the edges in large pieces that tend to stay in the frame.
In our catalogue today
- Heat-strengthened6, 8, 10, 12 mm Specification sheet (PDF)
Where it is used
- Laminated with another pane for overhead and structural glass
- Large panes that must resist heat stress
Toughening and processing
- Toughening
- Heat-strengthened glass is not a safety glass on its own; it is laminated where safety glass is needed.
- Processing
- Cannot be cut or drilled after heat treatment.
Standards
| Standard | What it covers |
|---|---|
| BS EN 1863-1Glass in building. Heat strengthened soda lime silicate glass. Definition and description | Heat-strengthened glass: about twice the strength of annealed glass, breaking into larger pieces that tend to stay in the frame. Not a safety glass on its own; used laminated. |
| BS EN ISO 12543Glass in building. Laminated glass and laminated safety glass | Laminated glass: two or more panes bonded with an interlayer that holds the pieces together if the glass breaks. Part 2 covers laminated safety glass. |