Dell Latitude 5420 Rugged Service Manual page 30

Youngs Modulus
Poissons Ratio
Shear Modulus
Vickers Hardness (200 g load)
• Un-strengthened
• Strengthened
Fracture Toughness
Coefficient of Expansion (0 ˚C - 300 ˚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**
Compression layer
Photo-elastic constant
** 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
HCl - 5%
NH4F:HF - 10%
HF - 10%
NaOH - 5%
Electrical
Table 17. Electrical
Frequency (MHz)
54
163
272
272
490
599
30 Technology and components
Time
24 hrs
20 min
20 min
6 hrs
Dielectric Constant
7.08
7.01
7.01
7.00
7.99
7.97
76.7 GPa
0.21
31.7 GPa
2
489 kgf/mm
2
596 kgf/mm
2
596 kgf/mm
0.5
0.69 MPa m
-7
78.8 x 10 /°C
1.50
1.51
30.3 nm/cm/MPa
Temperature (ºC)
95
20
20
95
Loss Tangent
0.009
0.010
0.011
0.010
0.010
0.011
Weight Loss (mg/cm2)
5.9
1.0
25.2
2.7