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Additional info for Fundamentals of Contamination Control
Using the absorptance profile, αc(λ), shown in Figure 2-6, and the solar output, S(λ), given in Figure 2-2, provides the degradation curve previously shown in Figure 2-8. This curve is reproduced in Figure 2-23 to illustrate the relationship between the degradation in αs and x more vividly. 00 0 10 Wavelength (microns) Contaminant Thickness (µm) Figure 2-23. 06 as a function of MIL STD 1246C cleanliness levels. 06. 1 µm, or surface cleanliness level G. This contamination requirement is interpreted as the “average” contamination value.
Comparing the initial and final mass of the sample yields the change in mass, ∆m, which is known as the Total Mass Loss (TML). Because T, t1, and t2 are known, once ∆m is determined the reaction constant C can be evaluated, provided that the activation energy of the material is known. For most spacecraft organic materials, the activation energy is in the range 5 – 15 kcal/mol. Knowing the specific value for a specific material will infer C. More often, the outgassing will be due to a conglomeration of material so that a rough estimation of the “average” activation energy, (usually taken to be 10 kcal/mole), is all that is available.
More often, the outgassing will be due to a conglomeration of material so that a rough estimation of the “average” activation energy, (usually taken to be 10 kcal/mole), is all that is available. Note that ASTM E 595 is incapable of deducing C if Ea is unknown. 2. The concern in contamination control is not merely over how much mass will be outgassed, but also over how much of the outgassed mass will condense on a sensitive surface. To determine this second parameter, the ASTM E 595 outgassing test utilizes a collecting plate, held at 25°C, to measure the amount of collected volatile condensable material (CVCM).