Path: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Catrike Ryder Newsgroups: rec.bicycles.tech Subject: Re: Patching TPU innertube Date: Thu, 26 Dec 2024 11:09:00 -0500 Organization: A noiseless patient Spider Lines: 70 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 26 Dec 2024 17:09:03 +0100 (CET) Injection-Info: dont-email.me; posting-host="c368897b5427baa1f7dfc67e872ecea3"; logging-data="3215389"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/cX2MjntfzH1hZDKIcqLRrSC7YMW8WpM8=" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:oqgNYTsZW3yhe5i1llqYGxQp4+U= Bytes: 3671 On Thu, 26 Dec 2024 09:45:37 -0600, AMuzi wrote: >On 12/26/2024 9:20 AM, Roger Merriman wrote: >> AMuzi 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