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A comment on Space shuttle Endeavour's giant orange external tank begins final journey. Parent comment

Re:Space shuttle Endeavour's giant orange external tank begi... by whycome on Thursday January 04, 2024 @08:55AM (#38866978)
Rarely mentioned, but I think the foam is polyisocyanurate. I think it changes to the rust colour due to exposure (it's typically light yellow). Anyone got more info?

https://ntrs.nasa.gov/citations/19890003374

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