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Most of the silicone we had for space use 50 years ago was one off expensive stuff but generally RTV that you can now buy commercially. Glued the solar cells to the skin of the satellite which was an exotic binder but still fiberglass. Expected life was unknown but longer than sattelite
Problems we had with silicon was no structural strength, couldn't use it to build things just stick them together or seal stuff.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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