Table of Contents
Outgassing is the release of trapped gas or vapor that was previously dissolved, trapped, frozen, or absorbed in the solid.
What is the process of outgassing?
Outgassing is the process in which a non-metallic material such as a polymer, adhesive, rubber, or potting compound / epoxy will release a gas when exposed to heat and or a vacuum. This gas will eventually condense on other materials, and could render them inoperable.
What is outgassing and why is it important?
For some applications, a critical component of selecting a seal material is a phenomenon known as “outgassing”. A seal material with low outgassing is essential because it shows the seal material does not emit volatile constituents under vacuum conditions.
What causes outgassing?
The effects of outgassing can impact a wide range of application areas in electronics, from satellites and space-based equipment to medical systems and equipment. In space-based equipment, released gas can condense on such materials as camera lenses, rendering them inoperative.
What is an example of outgassing?
The release of gases during volcanic eruptions is one example of outgassing; releases at submarine hydrothermal vents are another.
What’s the definition of outgassing?
transitive verb. 1 : to remove occluded gases from usually by heating broadly : to remove gases from. 2 : to remove (gases) from a material or a space. intransitive verb. : to lose gases.
What is the scientific definition of outgassing?
Outgassing (sometimes called offgassing, particularly when in reference to indoor air quality) is the release of a gas that was dissolved, trapped, frozen, or absorbed in some material.
What problems can outgassing produce?
Sick building syndrome. According to the Minnesota Department of Health, VOCs are known to be particularly adverse to those with respiratory problems, the elderly, young children, and those with chemical sensitivities. Outgassing can contribute to sick building syndrome (or “new building syndrome”).
What is degassing and outgassing?
Outgassing is the spontaneous evolution of gas from solid or liquid. Degassing is the deliberate removal of gas from a solid or a liquid. Desorption is the release of adsorbed chemical species from the surface of a solid or liquid.
Why is outgassing bad in space?
Outgassing is another major concern. Outgassing of volatile silicones in low Earth orbit (LEO) cause a cloud of contaminants around the spacecraft. Contamination from outgassing, venting, leaks, and thruster firing can degrade and modify the external surfaces of the spacecraft.
How do you prevent outgassing?
The problem of out-gassing can be prevented by following a few simple methods: Clean the Part: The simplest solution is to clean the part before the powder coating and curing process takes place. Apply a Primer: The part surface can be sealed by first applying a primer to the application substrate.
How do you reduce outgassing?
How to Prevent OffGassing Clean often. Hardwood floors and furniture are better than carpet when it comes to indoor air quality. Avoid foam items if possible. Choose natural fibers that are fire-resistant such as polyester, wool, hemp, or cotton. Purchase a HEPA-filter vacuum. Buy non-toxic cleaners or make your own.
What are products of outgassing?
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 is the most common gas released by outgassing?
The initial atmosphere was produced by volcanic outgassing early in geologic history, and it probably consisted largely of carbon dioxide since this is the most abundant volcanic gas.
What is the most common greenhouse gas released by outgassing?
Carbon dioxide (CO2) is the most significant greenhouse gas. Natural sources of atmospheric CO2 include outgassing from volcanoes, the combustion and natural decay of organic matter, and respiration by aerobic (oxygen-using) organisms.
What is outgassing from the ocean?
Volcanic eruptions spewed gases from Earth’s interior to the atmosphere, a process called outgassing that continues today. The water vapor condensed to form part of Earth’s oceans as the surface cooled.
How do you measure outgassing?
The chamber’s average outgassing rate is measured using these steps (a specific example’s values are quoted in parentheses): Estimate or measure the chamber’s volume (53 liters)Measuring Outgassing Rates. Function Calculation Result Outgassing rate in SI units 2.2 x 10 – 9 T.L/sec multiplied by 1333.2 2.9 x 10 – 6 W/m 2.
How do you test for outgassing?
Common outgassing testing techniques include static headspace analysis and dynamic headspace analysis. In static headspace analysis, a sample is heated to a specific temperature in a sealed vial. This is done so that volatile compounds can escape into the headspace area above the sample.
What is low outgassing?
Developed by NASA to screen low outgassing materials for use in space, the test determines the volatile content of material samples placed in a heated vacuum chamber. Samples to be tested are first preconditioned at 50% relative humidity for 24 hours and then weighed.
What is the purpose of degassing chemistry?
Degassing refers to the process by which dissolved gases are removed from a liquid. The presence of dissolved gases such as oxygen or carbon dioxide can impede chemical reactions that utilize sensitive reagents, interfere with spectroscopic measurements, or can induce unwanted bubble formation.
What is degassing in geology?
Degassing is the liberation of gases from within a planet, and it may occur directly during volcanism or indirectly by the weathering of igneous rocks on a planetary surface. From: Earth as an Evolving Planetary System, 2005.
What is degassing of steel?
The term degassing is employed to remove nitrogen and hydrogen from steel. Dissolved oxygen from steel melt cannot be removed as molecular oxygen. Removal of oxygen is termed deoxidation and is discussed in lecture 24.
Is off gassing toxic?
Off-gassing and your health VOCs can cause headaches, nausea, loss of coordination and eye, nose and throat irritation. More serious health effects can include damage to the kidneys, liver or central nervous system, as well as some forms of cancer.
Do heatsinks work in space?
Temperature System Active heat sinks release heat into space when instructed to. Other ways to actively cool the ship are are heat pipes which carry hot material to cooler parts of the ship, shutters that open or close like louvers, and simply changing the craft’s orientation.
What problems do satellites encounter in space?
Even with this equipment, space travelers encounter a variety of health risks – including atrophied muscles, weakened bones, and lowered immunity. The machinery we launch into space is also subject to hazards. Satellites, in particular, contain sensitive electronics that must be shielded from radiation.
