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Colin_the_Bald
HHC
Supposedly improves stiffness and eliminates vibrations. I think bianchi used it in some of their frames.
Issue after a while it shrinks, loosing all those advantages, and can also accumulate water and limit its evaporation causing rust in steel frames.
I guess not much of an issue if you were a keirin rider cause it probably wouldn't survive long enough for that to happen.
(I think)