Products
Heat-Strengthened Glass
Produced with the same process as tempered glass but cooled more slowly. Surface tension is lower — roughly 2× the strength of annealed glass, breaking into larger fragments similar to annealed.
Process
- Heated similarly to tempered glass but cooled more slowly, producing lower surface compression.
- Uses the same broad range of base glass as tempering, subject to pattern and coating compatibility.
Advantages
- About twice the strength and heat resistance of annealed glass
- Breaks into larger fragments that tend to remain in the frame — suited for IGU inner panes and spandrels
- Very low risk of NiS spontaneous breakage compared with tempered
- Withstands approximately 290 °C and thermal shock of around 100 °C
Limitations and inspection
- Suitable for spandrels, IGUs and wind-loaded glazing where safety glass is not mandated.
- Cannot be cut, drilled, notched or edge-worked after processing; roller wave or bow may occur.
- Not a safety-glass substitute for tempered glass. Large fragments can fall from frameless work, so loads and retention must be engineered.
- Minimum size is 180 × 180 mm. Do not use for roofs, floors, stairs or fire barriers.
- Verification uses destructive testing or polarizing film.
Specifications
| Thickness | 3, 4, 5, 6, 8, 10, 12 mm |
|---|---|
| Max. size | 2,800 × 6,000 mm |
| Strength | ≈ 2× annealed glass |
| Breakage | Cracks propagate to edges and form large fragments |
| Thermal shock | Approximately 100 °C |
| Application | Spandrels, IGUs where safety glass not required, wind walls |
Product gallery
Heat-Strengthened Glass examples
