What is outgassing in space?
NASA Technology Similar to offgassing, outgassing occurs when certain materials are subjected to the vacuum of space. Outgassing can pose a significant problem to spacecraft engineers, as their creations will be subjected to extreme temperature fluctuations due to the sun’s unfiltered radiation.
What is considered low outgassing?
To meet NASA Outgassing requirements, TML must be less than 1% and the CVCM must be less than 0.1%. Both requirements must be met to be considered a NASA Low Outgassing material. Most recently, EB-135 was tested for NASA Outgassing and passed at 3 different cure schedules.
Why is outgassing important in space?
Polymeric materials can outgas in the space environment, causing mass loss, not only affects the performance of the material itself, the outgassing products and its formed self-atmosphere also have detrimental effects on the spacecraft itself. Therefore, it is important for materials outgassing research.
What is outgassing and why is it important?
This gas will eventually condense on other materials, and could render them inoperable. The outgassing performance of a material is vitally important in areas with sensitive electronics, lenses (optics), mirrors, and windows to prevent damage of those items.
How does outgassing occur?
Outgassing is the result of desorption of previously adsorbed molecules, bulk diffusion, permeation and vapourisation. Adsorption occurs via two main processes, physisorption and chemisorption, and can be described using five (or six) classifying isotherms.
Where does outgassing occur?
Outgassing can be significant if it collects in a closed environment where air is stagnant or recirculated. For example, new car smell consists of outgassed chemicals released by heat in a closed automobile. Even a nearly odorless material such as wood may build up a strong smell if kept in a closed box for months.
Do all plastics outgas?
So what exactly is “outgassing”? Most plastics contain volatile organic compounds (VOCs). These are poisonous, carbon-containing chemicals that are volatile enough to evaporate even at room temperature. PVC, or Polyvinyl chloride, is one of the best known plastics for its odour.
What material is outgas?
The most predominant gases / vapors outgassing from surfaces are water vapor, oil and grease vapor, solvents, organic materials. In the upper reaches of Ultrahigh (UHV) vacuum, the stainless steel used to manufacture much of the chamber itself outgases hydrogen and carbon monoxide to some degree.
What causes outgassing?
The outgassing of small pockets of air near the surface of setting concrete can lead to permanent holes in the structure (called bugholes) that may compromise its structural integrity.
When did outgassing start?
Earth’s first atmosphere 4.6 billion years ago was most likely comprised of hydrogen and helium (two most abundant gases found in the universe!) Through the process of outgassing, the outpouring of gases from the earth’s interior, many other gases were injected into the atmosphere.
Do metals off gas?
So choosing real wood furniture, or furniture from metal, which doesn’t off gas. Even solid wood furniture made with toxic glues and adhesives isn’t good. So check to make sure no-VOC paints, sealants and stains are used.
What is the largest component of outgassing?