UQG Optics

KOVAR SEALING GLASS CORNING 7056
Mechanical
Density 2.29g/cm3
Yuong's Modulus 6.4 x 103 kg/mm2
Poisson's Ratio 0.21
Shear Modulus 2.7 x 103 kg/mm2
Viscosity
Working Point (104 poise) 1058°C
Softening Point (107.6 poise) 718°C
Annealing Point (1013 poise) 512°C
Strain Point (1014 poise) 472°C
Thermal
Coefficient of Expansion (0-300°C) 51.5 x 10-7/°C
(25°C to set point 679°C) 54.5 x 10-7/°C
Optical
Refractive Index (589.3 nm) 1.487
Birefringence Constant 300nm/cm/kg/mm2
Electrical
Log10 Volume Resistivity @250°C 10.3 ohm-cm
@350°C 8.4 ohm-cm
Dielectric Constant @ 20°C, 1MHz 5.7
Loss Tangent @20°C, 1MHz 0.27%


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