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AZ-400-LSW White Thermal Control Paint / Coating
AZ-400-LSW is an organic white thermal control paint developed for use on spacecraft and satellites to coat hard anodized aluminum. A specialized pigment in a silicone binder, AZ-400-LSW can be spray deposited with an air brush or high-volume low-pressure system with the ease of other silicone paints to form a flexible organic nonspecular white marker paint. AZ-400-LSW meets flammability and toxicity requirements of NHB 8060.1C.
The main advantage of AZ-400-LSW relative to AZ-93 and AZW/LA-II is that it has very low out outgassing and does not require controlled temperature and humidity when applying.
The table below lists the optical and application parameters of cured AZ-400-LSW.
|Nominal Surface Resistivity
|Thermal Emittance (ε_t)
||0.91 ± 0.02
|Solar Absorptance (α_s)
||0.17 ± 0.02 at ≥ 3.0 mils thickness
|Use Temperature Range
||-180 C to 700 C
||Nonspecular optical white
|Nominal Dry Thickness
||3.0 ± 1.0mils (over 85% of coated area)
|ASTM D3359A Adhesion Grade
||Not less than 3A
||48 to 72 hours
View a typical spectral reflectance curve for AZ-400-LSW (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.