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Spray-foam vibration dampening?
Last Post 05/19/2015 04:18 PM by Nicholas Arenella. 4 Replies.
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6ix

Posts:203

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05/18/2015 02:15 PM
Got to thinking about this earlier today while I was trying to figure out a way to prevent my rear brake cable from vibrating against the inner walls of the top-tube on rough pavement. The sound is, um, rattling to say the least and quite loud. I managed to place some rubber o-rings around the cable and tuck them back inside. Hopefully it will work but also started thinking about using spray-foam similar to what's used for sealing gaps around doors and windows. I know this could potentially go terribly wrong should the foam expand so much as to distort or even crack the carbon from inside-out. Any thoughts to this? I recall Sampson offering their hydroformed aluminum frames with some type of internal foam years ago. It was done as a bit of a vibration dampening. Foam doesn't exactly weigh much so it's not a bad idea. Just needs to be applied correctly and safely.
Dale

Posts:925

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05/19/2015 09:08 AM
Binachi aluminum EV2 frames had injected foam just above the BB to add a bit more strength. The first generation had frame crack issues in that area. They even had a decal with "Structural foam inside" or something like that and warned shops to not use solvents as it would cause foam degradation.

As long as there is a place for the foam to expand you shouldn't have an issue.
huckleberry

Posts:490

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05/19/2015 10:01 AM
Will it cause any problems with recabling?

What material is the frame made of? Will there be any chemical interaction between the foam and frame material.
Gonzo Cyclist

Posts:568

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05/19/2015 11:58 AM
hmmmm, I think the only issue is you would have to do it a little at a time so it would cure out.
Used that stuff for some jeep doors once, just went to town with it, did not let it cure out. I had slimey goo stuff coming out of the bottom of the doors for months
Nick A

Posts:523

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05/19/2015 04:18 PM
I've used that stuff for its intended purpose. There's the standard stuff that hardens, well hard. Then they have a version for doors or windows that's supposed to be softer, so that upon expanding it won't warp more flexible window frames and the like. Also, if you get ANY of it on ANYTHING it is VERY hard to get off! It also expands a lot more than you think...and it takes a minute, so if you're not careful you see it expand for five or ten seconds, and think, "oh I'll put more" and several minutes later, it's oozing out everywhere.

Nick
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