Germanium Buy Requirement from Poland - 13-Mar-2026

Dear Sir,

We are seeking optical-grade Germanium for military
production that meets the specifications listed below.

Material: optical-grade monocrystal
Transmission Range 1.8 to 23µm
Refractive Index 4.0026 at 11µm
Reflection Loss 53% at 11µm (Two surfaces)
Absorption Coefficient <0.03 cm-1 @ 10.6µm
Maximum resistivity at 20 ?C 40 O.cm
Conductivity type N
Substrate Orientation (100) ? 0.5?
dn/dT 396 x 10-6 K-1
Density 5.33 g/cc
Melting Point 936 ?C (3)
Thermal Conductivity 58.61 W m-1 K-1 at 293K
Thermal Expansion 6.1 x 10-6 K-1 at 298K
Hardness Knoop 780
Specific Heat Capacity 310 J Kg-1 K-1
Dielectric Constant 16.6 at 9.37 GHz at 300K
Youngs Modulus (E) 102.7 GPa
Shear Modulus (G) 67 GPa
Bulk Modulus (K) 77.2 GPa
Poisson Ratio 0.28

For legal compliance, a certificate of origin is required.

Best Regards,

Contact: Mr. Katarzyna Rawska
Company: Rav Sky

Posted on : 13-Mar-2026
Posted From : Poland

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