Germanium Oxide Infrared Transmitting Glass
Germanium oxide glass is a grade of infrared transmitting glass. The graph bars on the material properties cards below compare germanium oxide glass to other glass and glass-ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
63 GPa 9.2 x 106 psi
Flexural Strength
79 MPa 11 x 103 psi
Poisson's Ratio
0.3
Thermal Properties
Specific Heat Capacity
430 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
0.0060 W/m-K 0.0035 BTU/h-ft-°F
Thermal Expansion
9.0 µm/m-K
Otherwise Unclassified Properties
Density
4.8 g/cm3 300 lb/ft3
Refractive Index
1.8
Common Calculations
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
28 points
Thermal Diffusivity
0.0029 mm2/s
Followup Questions
Further Reading
Glass: Mechanics and Technology, Eric Le Bourhis, 2007
Handbook of Optical Materials, Marvin J. Weber, 2003
Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998