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Contamination is not the only reason for those suits. Static electric control is quite strick. Fabrics may be woven with electrically conductive materials so that static electric is not a threat.
Working in such environments is interesting. How do you tell who is who - especially when you don't know most people in the other shifts? Somehow I managed to learn without knowing why. They later tell me, learn by viewing the eyes. However I also found height to be important.
Contamination is also why recovering satellites from space using the shuttle was not productive. Any space vehicle brought back to earth in a shuttle bay was so contaminated as to require complete disassembly and cleaning. Often cheaper to just build a new one.
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