Glass Substrates
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| Properties |
Tempered Glass |
Heat strengthened glass |
Annealed Glass |
| Thermal stress |
Upto 250ºC |
Upto 130ºC |
Upto 50ºC |
| Strength |
4 times of annealed |
2 times of annealed |
Not strong |
| Bending strength |
120 - 200 N/mm² |
60 - 100 N/mm² |
40 N/mm² |
| Design stress |
50 Mpa |
27 Mpa |
17 Mpa |
| Surface compression |
> 10000 psi (69 Mpa) |
3500-7500psi (24-52 Mpa) |
Upto 2800 psi (19 Mpa) |
| Safety |
Appoved as safety glazing for most applications |
Not approved as safety glazing |
Not approved as safety glazing |
| Site alterations |
Not possible |
Not possible |
Possible |
| Flatness |
Slight bow and corrugation |
Bow and corrugation lower than tempered glass |
Very flat |
| Optics |
Reasonably good |
Good. Comparatively better than tempered glass |
Very good |
| Lamination |
Min 1.52 PVB |
Mn 1.52 PVB |
Min 0,38mm PVB |
| NİS breakage |
Prone |
Extremely rare possibilty |
Non existent |
