Editing TransHab (section)

===Multi-Layer Inflatable Shell===
TransHab's inflatable shell consisted of multiple layers of [[Thermal insulation|blanket insulation]], [[Ballistic vest|protection]] from [[Space debris|orbital]] and [[meteoroid]] debris, an optimized restraint layer and a redundant [[Bladder (disambiguation)|bladder]] with a protective layer.<ref name="nasa20030627"/>

TransHab's foot-thick inflatable shell design had almost two dozen layers. The layers were fashioned to break up particles of space debris and tiny meteorites that might hit the shell with a speed seven times as fast as a bullet. The outer layers protect multiple inner bladders, made of a material that holds in the module's air. The shell also provides insulation from [[Outer space#Temperature|temperatures]] in [[Outer space|space]] that can range from plus 121 degrees Celsius (plus 250 degrees Fahrenheit) in sunlight to minus 128 degrees Celsius (minus 200 degrees Fahrenheit) in the shade.<ref name="nasa20030627"/>

The key to the debris protection in the design and prototype units was successive layers of [[Nextel]],<ref>[http://www.3m.com/Product/information/Nextel-Woven-Fabric.html 3M Nextel Woven Ceramic Fabric]</ref> a material commonly used as insulation under the hoods of many cars, spaced between several-inches-thick layers of open cell foam, similar to foam used for chair cushions on Earth. The Nextel and foam layers cause a particle to [[Terminal ballistics#Hypervelocity|shatter]] as it hits, losing more and more of its energy as it penetrates deeper.<ref name="nasa20030627"/>

Many layers deep in the shell was a layer of superstrong woven [[Kevlar]] to hold the module's shape. The air was held inside by three bladders of Combitherm,<ref>[http://www2.dupont.com/Surlyn/en_US/uses_apps/cookinfilm.html DuPont, Surlyn-resin, Combitherm-film case study]</ref> a material commonly used in the food-packing industry. The innermost layer, forming the inside wall of the module, was [[Nomex]] cloth, a [[fireproof]] material that also protected the bladder from scuffs and scratches.<ref name="nasa20030627"/>