Properties
Table 14. Properties
Density 2.39 g/cm
Youngs Modulus 69.3 GPa
Poissons Ratio 0.22
Shear Modulus 28.5 GPa
Vickers Hardness (200 g load)
● Un-strengthened
● Strengthened
534 kgf/mm
2
596 kgf/mm
2
649 kgf/mm
2
Fracture Toughness 0.66 MPa m
0.5
Coefficient of Expansion (0 ˚C - 300 ˚C) 75.8 x 10
-7
/°C
Chemical Strengthening
Capability of >950 MPa CS, at 40 µm
Specifications subject to change
Optical
Table 15. Optical
Refractive Index (590 nm)
Core glass** 1.50
Compression layer 1.51
Photo-elastic constant 31.9 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 3.
Table 16. Chemical Durability
Reagent Time Temperature (ºC)
Weight Loss (mg/cm2)
HCl - 5% 24 hrs 95 0.6
NH4F:HF - 10% 20 min 20 2.1
HF - 10% 20 min 20 12.3
NaOH - 5% 6 hrs 95 1.9
32 Technology and components
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