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Old 2019-05-24, 08:43 AM   #5
Join Date: Aug 2017
Location: Scotland
Posts: 62
Thermoplastic inner tubes (which I think FOSS tubes are) should, I think, stay inflated with helium longer than butyl tubes. One of their advantages is that they keep air pressure better so presumably this makes them less permeable to helium as well. Quite how they would compare to the mylar foil used for helium balloons I have no idea.

Some info on thermoplastic tubes:

Quite whether it is a good idea or not, looking at more aspects than just weight saving, is explored (somewhat tongue-in-cheek) here:
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