- Thermal Micrometeoroid Garment
An (Integrated) Thermal Micrometeoroid Garment (TMG or ITMG) is the outer layer of a
space suit. The TMG has three functions: to insulate the suit occupant and prevent heat loss, to shield the occupant from harmful solar radiation, and to protect the astronaut from micrometeoroids, which could puncture the suit and depressurize it.
The specific design of TMGs varies between different space agencies and different suits, though they all serve the same purpose.
Apollo/Skylab A7L suit
Outside of a
Liquid Cooling and Ventilation Garment, pressure bladder, and restraint layer, the TMG for the A7L suit worn on the Moon and during the SkylabProgram began with a layer of neoprene-coated nylon ripstop. This was the innermost layer of protection from micrometeoroids. Next, thermal radiationprotection was provided by five layers of aluminized PET film ( Mylar), alternating with four layers of nonwoven Dacron, which provided thermal spacing, followed by two layers of aluminized polyimide Kaptonfilm and Beta cloth[http://dictionary.reference.com/browse/marquisette marquisette] laminate. The outermost layer of PTFE ( Teflon)-coated filament Beta cloth was non-flammable and provided abrasion protection from the notoriously abrasive lunar dust. This layer was supplemented with Teflon abrasion patches at the knees and other areas. [cite book
last = Carson
first = Maurice A.
coauthors = Rouen, Michael N., Lutz, Charles C., and McBarron, James W. II
title = Biomedical Results of Apollo - Section VI - Chapter 6 - Extravehicular Mobility Unit
publisher = Lyndon B. Johnson Space Center
url = http://lsda.jsc.nasa.gov/books/apollo/S6CH6.htm
id = ]
pace Shuttle/EMU suit
The construction of the TMG on the EMU suits in use on the
Space Shuttleand International Space Stationdiffers somewhat from the construction of the Apollo/Skylab TMG.
The EMU TMG includes seven layers of aluminized Mylar laminated with Dacron, rather than five, and eliminates the use of Kapton. The outermost layer is white Ortho-Fabric, made with a blend of
Gore-Tex, Kevlar, and Nomex. This layer can withstand temperatures from −300° to +300° Fahrenheit. The outer layer provides both micrometeoroid and thermal protection, by reflecting most of the sun's thermal radiation. [cite web
title = thermal micrometeoroid garment
work = everything2
date = November 13,
url = http://everything2.com/index.pl?node_id=1198621
accessdate = 2006-01-07 ]
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