The Development and Qualification of Thermal Control Coatings for Snap Systems Page: 57 of 75
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TABLE 7
THERMAL EMITTANCE AND SOLAR ABSORPTANCE OF FULLER
ACRYLIC LACQUER ON ALUMINUM HONEYCOMB
Specimen As Received After Weather 350-FtExposure,
No.
E as as E as
1 0.90 0.29 0.85 0.28 0.86 0.32
2 0.90 0.28 0.86 0.29 0.87 0.32
3 0.91 0.25 0.87 0.24 0.87 0.26
4 0.91 0.25 0.87 0.24 0.87 0.26
5 0.90 0.26 0.87 0.27 0.85 0.27
6 0.90 0.25 0.86 0.25 0.87 0.27
7 0.90 0.26 0.83 0.27 0.85 0.27
8 0.90 0.25 0.87 0.27 0.86 0.27
Average 0.90 0.26 0.86 0.26 0.86 0.28
Fuller White Acrylic Lacquer #171W560
maintained at 3500F, 10-5 torr, for 24 hr. The final emittance measurement
was determined to be 0.07.
Table 7 gives the results for the Fuller Acrylic Lacquer. The solar
absorptance of the coating remained relatively constant throughout the tests.
The thermal emittance of the coating decreased 5% subsequent to the weathering
test. These data are entirely suitable since the overall balance of the heat
shield is only slightly affected by the lacquer. The heat shield surface contains
only 2% of the White Lacquer finish. This fact also negates concern that the
White Lacquer will degrade in a space ultraviolet environment.
For design considerations, the thermal emittance and solar absorptance
values utilized were:Coating on Aluminum Honeycomb
Alodine 1000
Fuller Acrylic Lacquer
Fuller Aluminum Silicone PaintThermal Emittance
0.07
0.86
0.25Solar Absorptance
0.35
0.28
0.31NAA-SR-9908
53
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Crosby, J. R. The Development and Qualification of Thermal Control Coatings for Snap Systems, report, September 30, 1965; Canoga Park, California. (https://digital.library.unt.edu/ark:/67531/metadc1028869/m1/57/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.