Outgassing
Low Outgassing
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Outgassing - Wikipedia, the free encyclopedia
Outgassing (sometimes called offgassing, particularly when in reference to ... Outgassing data for some nonmetallic materials (table 3) ...
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Boedeker Plastics : Outgassing of Engineering Plastics
Boedeker Plastics, Inc. 1-800-444-3485 : Outgassing of Engineering Plastics ... Actual surface contamination from the outgassing of materials will, of course, ...
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Outgassing Laboratory Description
This tenth compilation of outgassing data of materials intended for spacecraft ... The outgassing data have been presented in three different ways in order to ...
outgassing.nasa.gov
Outgassing Data for Selecting Spacecraft Materials System
+ Visit NASA.gov. Outgassing Data for Selecting Spacecraft Materials ... For further information about the outgassing data, please contact Debbie Thomas: ...
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outgas: Definition from Answers.com
outgas ( ) v. , -gassed , -gassing , -gasses . v.tr. To remove embedded gas from (a solid), as by ... Outgassing data for some nonmetallic materials (table 3) ...
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Energy Citations Database (ECD) - - Document #5795378
A carbon-bonded carbon-fiber (CBCF3) thermal insulation has been developed and has demonstrated acceptable strength, thermal conductivity, and outgassing properties ...
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Defect Troubleshooter: Outgassing
Wave Soldering Defects - Outgassing. Outgassing is still a common problem associated with wave and ... Have you tested the boards with the outgassing test? ...
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Lunar Outgassing, Transient Phenomena and The Return to The Moon III ...
correlate with lunar outgassing, geographically, based on surface radon release ... outgassing, its relation to other lunar processes, and an increase in our ...
www.astro.columbia.edu
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Outgassing (sometimes called "Offgassing," particularly when in reference to indoor air quality) is the slow release of a gas that was trapped, frozen, absorbed or adsorbed in some material., Chapter 3 It can include sublimation (chemistry) and evaporation which are phase transitions of a substance into a gas, as well as desorption, seepage from cracks or internal volumes and gaseous products of slow chemical reactions. Boiling is generally thought of as a separate phenomenon from outgassing because it occurs much more rapidly.
Outgassing in a vacuum Outgassing is a challenge to creating and maintaining clean high-vacuum environments. NASA maintains a list of low-outgassing materials to be used for spacecraft, as outgassing products can condense onto optical elements, thermal radiators, or solar cells and obscure them. Materials not normally considered absorbent can release enough light-weight molecules to interfere with industrial or scientific vacuum processes. Even metals and glasses can release gases from cracks or impurities, but moisture, sealants, lubricants, and adhesives are the most common sources. The rate of outgassing increases at higher temperatures because the vapour pressure and rate of chemical reactions increases. For most solid materials, the method of manufacture and preparation can reduce the level of outgassing significantly. Cleaning surfaces or baking individual components or the entire assembly before use can drive off volatiles.
NASA's Stardust (spacecraft) spaceprobe suffered reduced image quality due to an unknown contaminant that had condensed on the Charge-coupled device sensor of the navigation camera. A similar problem affected the Cassini-Huygens spaceprobe's Narrow Angle Camera, but was corrected by repeatedly heating the system to 4 degrees Celsius.
Outgassing from rock Outgassing is the source of many tenous Celestial body atmosphere of terrestrial planets or moons. Many materials are volatile relative to the extreme vacuum of space, such as around the Earth's Moon, and may evaporate or even boil at ambient temperature. Materials on the surface have completely outgassed and been ripped away by solar winds long ago, but volatile materials may remain at depth. Once released, gases almost always have a lighter density than the surrounding rocks and sand and seep toward the surface. The Moon's atmosphere probably originates from outgassing of warm material below the surface. At the Earth's Divergent boundary where new crust is being created, helium and carbon dioxide are some of the volatiles being outgassed from mantle (geology) magma.
Outgassing in a closed environment Outgassing can be significant if it collects in a closed environment where air is stagnant or recirculated. This is, for example, the origin of new car smell. Even a nearly odourless material such as wood may build up a strong smell if kept in a closed box for months. There is some concern that softeners and solvents that are released from many industrial products, especially plastics, may be harmful to human health. For example, the European Commission has banned the use of DEHP (di-2-ethyl hexyl phthalate) in Polyvinyl chloride manufacturing due to such concerns. Some types of RTV sealants outgas the poison cyanide for weeks after application. These outgassing poisons are of great concern in the design of submarines and space stations.
External links
- Outgassing Data for Selecting Spacecraft Materials Online
- Outgassing Data For Common Materials
- Outgassing data for some nonmetallic materials (table 3)
- ESA Outgassing Data for Spacecraft Materials according to ECSS-Q-70-02
Notes
Outgassing - Wikipedia, the free encyclopedia
Outgassing (sometimes called offgassing, particularly when in reference to indoor air quality) is the slow release of a gas that was trapped, frozen, absorbed or adsorbed in some ...
Outgassing Data for Selecting Spacecraft Materials System
For further information about the outgassing data, please contact Debbie Thomas: Debbie.L.Thomas@nasa.gov
Outgassing Section C
Outgassing Section C: Materials having a TML of 1.0 % or Less and a CVCM of 0.10 % or Less; Last Updated: 7/16/2008
APOD: 2004 March 19 - Going Wild
Pitted and eroded after billions of years of outgassing and meteorite impacts, the nucleus pictured is only about 5 kilometers in diameter, while the jets of dust and gas ultimately ...
Outgassing Contamination
The contamination associated with return flux self scattering of outgassing during the 2 year Genesis collection period is assessed using the SPACE II contamination model developed ...
outgassing database
The materials used for space systems shall be selected based upon low outgassing criteria. The outgassing criteria are based upon the micro-VCM test (ECSS-Q-70-02), and shall ...
outgassing - Definition at Your Dictionary
Preposition: of. moisture: The outgassing of moisture can also be seen during reflow curing of underfill on uBGA devices. component: Its new high pressure model DSC 204 HP allows ...
BBC News | SCI/TECH | Meteorite clue to water on Mars
Process of outgassing. There are abundant features on the Martian surface that testify to the vast amounts of water that must have run across the planet some time in the past.
Boedeker Plastics : Outgassing of Engineering Plastics
Boedeker Plastics, Inc. 1-800-444-3485 : Outgassing of Engineering Plastics ... information for Aerospace, Semiconductor, and other high-vacuum applications.
Discovering Outgassing Defects
Cathodic electrodeposition is commonly used as a coating process for automotive appliances and general industrial coatings. The process employs a modern electrodeposition line with ...