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Old January 4th 17, 06:35 PM posted to rec.bicycles.tech
Radey Shouman
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Posts: 1,747
Default Stronger rubber cement?

Jeff Liebermann writes:

On Wed, 04 Jan 2017 07:27:48 -0800, Joerg
wrote:

I'll look into contact cement. Gene also suggested that. Cost is not so
much an issue but shelf life after opening is. The usual rubber cement
is toast only a few months after opening.


I've had the same experience. The problem with the leaking bottles
and tubes seems to be related to heat. My squeeze tube of contact
cement doesn't last very long after it's used once, so I'm not sure
that looking for a better glue is the right answer. A better way to
prevent outgassing seems to be a better approach. As David Scheidt
suggests, buying the rubber cement or whatever in a can lasts much
longer. I keep my can inside a plastic Ziploc bag, which seems to
help. I've considered putting it inside a glass jar, and pressurizing
the jar to above the vapor pressure of the solvent to limit loss by
evaporation. I've done this with some chemicals and drugs, but never
tried it with glue.


I can't see how that would work -- the partial pressure of the solvent
inside and outside are the only variables that matter. Higher total
pressure should affect diffusion to the outside of the inner container
very little. An outer bag or jar works by concentrating the escaped
solvent, so it's important to keep the volume low.

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