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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


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


4.8 g/cm3 300 lb/ft3

Refractive Index


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