AZ Technology’s new low thermal emittance paint / coating was developed for use on spacecraft surfaces exposed to the deleterious effects of vehicle launch and space environment. Design objectives were to produce an electrostatic dissipative low emittance coating with an alpha over emittance value close to one.
AZ-3700-LSW is a high temperature electrostatic dissipative (ESD) type coating, based on a low off-gassing organic silicone type binder, that can be spray deposited with high-volume low-pressure systems onto large complex surfaces with minimal difficulty. AZ-3700-LSW uses a self priming binder, so that use of a primer is not required.
The table below lists the typical electrical, thermal optical and application parameters of cured AZ-3700-LSW.
|*Nominal Surface Resistivity||106-109 Ω/sq|
|*Thermal Emittance (ε_t)||Typically: 0.25 to 0.33|
|*Solar Absorptance (α_s)||Typically: 0.22 to 0.25 at ≥ 1.25 mils thickness|
|Use Temperature Range||-180C to 600C (no long duration test data available)|
|Appearance/Color||Nonspecular metallic gray|
|*Nominal Dry Thickness||1.0 to 2.0 mils|
|ASTM D3359A Adhesion Grade||Not less than 3A (Al Substrate)|
|Full Cure||48-72 hours|
|**ASTM 595 TWL/WVR/CVM %||0.047% / 0.035% /0.010%|
*Tailorable property, **Based on similarity
Note: terms reflectance, emittance and absorptance and terms reflectivity, emissivity and absorptivity are often used interchangeably.