Dell Latitude 7400 2-in-1 Service Manual - Page 12

Properties, Chemical Strengthening, Optical, Chemical Durability, Table 3. Properties - weight

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Properties Table 3. Properties Density Youngs Modulus Poissons Ratio Shear Modulus Vickers Hardness (200 g load) ● Un-strengthened ● Strengthened Fracture Toughness Coefficient of Expansion (0 ˚C - 300 ˚C) 2.43 g/cm 76.7 GPa 0.21 31.7 GPa 489 kgf/mm2 596 kgf/mm2 596 kgf/mm2 0.69 MPa m0.5 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 4. Optical Refractive Index (590 nm) Core glass** Compression layer Photo-elastic constant 1.50 1.51 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 5. Chemical Durability Reagent Time Temperature (ºC) Weight Loss (mg/cm2) HCl - 5% 24 hrs 95 NH4F:HF - 10% 20 min 20 HF - 10% 20 min 20 NaOH - 5% 6 hrs 95 5.9 1.0 25.2 2.7 12 Technology and components

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Properties
Table 3. 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 4. 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 5. 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
12
Technology and components