Properties
Table 14. Properties
Density
2.43 g/cm
Youngs Modulus
76.7 GPa
Poissons Ratio
0.21
Shear Modulus
31.7 GPa
Vickers Hardness (200 g load)
●
Un-strengthened
●
Strengthened
489 kgf/mm
2
596 kgf/mm
2
596 kgf/mm
2
Fracture Toughness
0.69 MPa m
0.5
Coefficient of Expansion (0 ˚C - 300 ˚C)
78.8 x 10
-7
/°C
Chemical Strengthening
Capability of >850MPa CS, at 50 µm Depth Of Layer(DOL)
Specifications subject to change
Optical
Table 15. Optical
Refractive Index (590 nm)
Core glass**
1.50
Compression layer
1.51
Photo-elastic constant
30.3 nm/cm/MPa
** Core index is used for FSM-based measurements since it is unaffected by ion-exchange conditions.
Chemical Durability
Durability is measured via weight loss per surface area after immersion in the solvents shown below. Values are highly dependent
upon actual testing conditions. Data reported is for Corning Gorilla Glass 5.
Table 16. Chemical Durability
Reagent
Time
Temperature (ºC)
Weight Loss (mg/cm2)
HCl - 5%
24 hrs
95
5.9
NH4F:HF - 10%
20 min
20
1.0
HF - 10%
20 min
20
25.2
NaOH - 5%
6 hrs
95
2.7
Technology and components
33
