Technical data of Xensation® Cover

Thermal Properties

Thermal Conductivity λ (25 °C)
0.96 W/(m•K)
Specific Heat Capacity Cp (20 °C; 100 °C)
0.84 KJ/(g•K)
Coefficient of Mean Linear Thermal Expansion α (20 °C; 300 °C)
8.8 • 10-6 K-1*
Transformation Point Tg
615 °C
Annealing Point (1013 dPas)
635 °C
Softening Point (107.6 dPas)
880 °C
Working Point (104 dPas)
1265 °C
*cooled according to DIN

Electrical Properties*

Frequency
Dielectric Constant
Loss Tangent
MHz
ε´
tanδ
1
7.74
0.011
54
7.49
0.008
480
7.40
0.009
825
7.38
0.010
912
7.38
0.010
1977
7.35
0.012
2170
7.35
0.012
2986
7.34
0.012
Electric Volume Resistivity ρD for A.C. at 50Hz
v = 250 °C
1.5 • 106 Ω•cm
v = 350 °C
8.9 • 104 Ω•cm
* These values are no guaranteed data - for customer orientation only.

Chemical Properties

Hydrolytic resistance acc. to DIN ISO 719 Class HGB 1
Acid Resistance acc. to DIN 12116 Class S 4
Alkali resistance acc. to DIN ISO 695 Class A 1

Optical Properties

Refractive Index at 588 nm (nd) 633 nm
780 nm
Core Glass 1.508 1.506
1.502
Compression Layer
--- KNO3 pure 1.516 1.514
1.510
Transmittance τ (Glass Thickness 0.7mm)
--- 840 nm
>91.5 %
--- 560 nm
>91.5 %
--- 380 nm
>90 %
--- Photoelastic Constant
29.2 nm/cm/MPa

Mechanical Properties

Density 2.477 g/cm3*
Young’s Modulus E 74 kN/mm2
Poisson’s Ratio 0.215
Shear Modulus 30 kN/mm2
Knoop Hardness HK 0.1/20
--- Non-strengthened 534
--- Strengthened 639
Vickers Hardness HV 0.2/20
--- Non-strengthened 617
--- Strengthened 681
*cooled according to DIN

Chemical Strengthening

Compressive Stress capable > 900 MPa
Depth of Layer capable > 50 μm
4-Point Bending Strength capable > 800 MPa

Sheet Dimensions

Sheet Size*: 1150 x 950 mm
475 x 575 mm
Thickness Range: 0.5 - 3.0 mm
*Other sizes on request.