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What is the white stuff on my seatpost?

SlimtimSlimtim Posts: 1,042
edited June 2007 in Workshop
I was under the impression that carbon seatposts and titanium frames should not react. I was surprised to find that when I took my broken Specialized Pave carbon seatpost out of my titanium Merlin frame that there was what appears to be some kind of white residue stuck to the post (easily removed) and also on the inside of the seattube (more difficult to remove).

I had expected the inside of the seattube to be plain titanium finish as it had been when I put the post in. I didn't grease the post by the way.

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