ML-210-IB Black Thermal Control Paint / Coating

ML-210-IB is an inorganic black paint originally designed for use on spacecraft and satellites.  A specialized carbon black pigment in a silicate binder, ML-210-IB is an inorganic paint that can be spray deposited over complex surfaces using an airbrush or a high-volume, low pressure system to form an inorganic nonspecular optical black coating. This coating has been ground tested for the rigorous environment of Low Earth Orbit (LEO).  Exposure to the Atomic Oxygen (AO) flux found in LEO does not significantly effect thermal and optical performance of ML-210-IB.  Samples of this coating were exposed to AO for a duration equivalent to about fifteen (15) years of time.  VUV exposure of the coating was about 130 times that of normal exposure.  For Geosynchronous Earth Orbit (GEO) and LEO applications as a baffle absorptance coating, ML-210-IB provides excellent service in optical and/or thermal applications.

ML-210-IB has a higher solar absorptance than either RM-550-IB or TMD-560-IB, but it cannot handle exposure to as high temperatures.

The table below lists the optical and application parameters of cured ML-210-IB.


Nominal Surface Resistivity N/A
Thermal Emittance (ε_t) 0.91 ± 0.02
Solar Absorptance (α_s) 0.98 ± 0.02 at ≥ 1.5 mils thickness
Use Temperature Range -180 C to 600 C
Appearance/Color Nonspecular optical black
Nominal Dry Thickness 2.5+1.0, -1.5 mils (over 85% of coated area)
ASTM D3359A Adhesion Grade Not less than 3A
Full Cure 7 days

View a typical spectral reflectance curve for ML-210-IB (pdf 27KB).  Measurements were taken with AZ Technology’s Laboratory Portable SpectroReflectometer LPSR-300.

Note: terms reflectance, emittance and absorptance and terms reflectivity, emissivity and absorptivity are often used interchangeably.