Spacecraft Thermal Coatings: germanium_kapton
Spacecraft thermal control coating optical properties — solar absorptivity (alpha) and infrared emissivity (epsilon) for common spacecraft thermal surfaces. Covers white paints (S13G/L, Z-93/AZ-93, YB-71, Aeroglaze A276), black paints (Aeroglaze Z306/Chemglaze Z306, MAP-9, carbon-black, Acktar Fractal Black), optical solar reflectors (OSR quartz/Ag, OSR glass/Al, flexible Ag-FEP), silver-Teflon tape (Ag/FEP 2-mil and 5-mil), gold foil (VDG on Kapton), aluminized Kapton (Al-side out, Kapton-side out, double-aluminized), bare metals (polished Al, alodine Al, electropolished SS, mechanically polished SS, Ti-6Al-4V), anodized aluminum (clear anodize, black anodize), MLI materials (beta cloth, embossed Al-Mylar), and conductive coatings (Ge/Kapton, ITO/Kapton). All values are BOL (beginning of life). Data from NASA RP-1121, Gilmore Spacecraft Thermal Control Handbook 2nd Ed., AZ Technology, Acktar, Socomore/Lord Aeroglaze, and peer-reviewed literature.
| coating category | coating name | alpha notes | alpha sol (dimensionless) | application | epsilon ir (dimensionless) | epsilon notes |
|---|---|---|---|---|---|---|
| germanium_kapton | Germanium-Black Kapton (Ge/Kapton) 2-mil | Germanium-coated Kapton providing electrostatic dissipation (ESD) control; black-Ge is solar absorbing | 0.48 | ESD-controlled surfaces; communications satellite MLI outer layer where charging is concern | 0.83 | High emittance from Ge/Kapton composite surface |
| germanium_kapton | Indium Tin Oxide (ITO) Coated Kapton | ITO transparent conductive oxide on Kapton; slight increase in alpha vs clear Kapton | 0.38 | ESD-sensitive MLI outer layers; solar arrays requiring ESD control; high-radiation LEO | 0.8 | Dominated by Kapton emittance |
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