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From: Catrike Ryder <Soloman@old.bikers.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Patching TPU innertube
Date: Thu, 26 Dec 2024 11:09:00 -0500
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On Thu, 26 Dec 2024 09:45:37 -0600, AMuzi <am@yellowjersey.org> wrote:

>On 12/26/2024 9:20 AM, Roger Merriman wrote:
>> AMuzi <am@yellowjersey.org> wrote:
>>> On 12/22/2024 8:30 PM, James wrote:
>>>> I got a snake bite puncture on one of my TPU innertubes.  I
>>>> haven't bought one of the commercial patch kits, so I
>>>> thought I would try a blob of Aquaseal.  Known for it's
>>>> usefulness in repairing neoprene stuff and more, I thought I
>>>> would give it a go.
>>>>
>>>> I tried to rough up the TPU innertube surface, but the
>>>> sandpaper didn't seem to have much if any effect.  I cleaned
>>>> it with a little Windex, and after that had dried and I had
>>>> rubbed it some more with clean tissue paper, I applied a
>>>> drop of Aquaseal to each hole.
>>>>
>>>> I have the stuff that takes about a day to solidify.  I left
>>>> the tube undisturbed for at least 12 hours, though I can't
>>>> recall exactly how long, before putting it back in the wheel
>>>> and inflating.
>>>>
>>>> This is on my gravel bike, with 40mm tyres that I inflate to
>>>> 40-45psi.
>>>>
>>>> The repair has held for a few hundred kilometers at least,
>>>> and now I have put different tyres on the bike, so I
>>>> inspected the repairs.
>>>>
>>>> The blobs of glue seem to have spread and flattened a bit,
>>>> but otherwise have appeared to bond well and not leaked.
>>>>
>>>
>>> Good choice. I knew nothing about the subject before
>>> snooping around just now. It seems Aquaseal active
>>> ingredient is methylenediphenyl diisocyanate which is
>>> compatible to TPU polyurethane.
>>>
>>> https://www.nrs.com/assets/downloads/msds/msds%202291%20aquaseal.pdf
>>>
>>> https://polyurethanes.basf.us/files/pdf/2019-MDI-Handbook_EL.pdf
>>>
>>> Making a reliable bond unlike a simple contact adhesive such
>>> as a stick-on patch.
>>>
>> 
>> Yup interesting stuff, I’d not persisted with TPU tubes, as on the Gravel
>> bike tubeless has solved that, and TPU seem to puncture just as easily as
>> butyl
>> 
>> I’ve toyed with idea of the MTB as with that and it’s burly tires punctures
>> aren’t a thing, but on the other hand would one notice the difference with
>> a TPU tube in terms of feel?
>> 
>> Hence I’ve chosen to not fix what isn’t broke for time being.
>> 
>> Roger Merriman
>
>"not fix what isn’t broke"
>
>Good plan. Which is why I'm riding the current version of 
>the 300g tubulars I rode 50+ years ago.


Changing something that improves functionality isn't the same as
fixing something that isn't broken. 

--
C'est bon
Soloman