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Adding Coolant To Water Based Sealants
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Bret Cahill
Jun 15, 2018, 2:10:33 PM6/15/18
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Tubeless MTB riders complain that sealants like Stan's No Flats must be scraped out and replaced every 2 months. Slime claims it'll work for up to 2 years in an inner tube. After a month on hot asphalt it's already drying out.
Water vapor permeates through butyl rubber 2 orders of magnitude faster than air. You can easily check this with kitchen scales. Weigh a sealant filled front wheel every 2 weeks this summer.
Polypropylene glycol is non toxic and greatly lowers the total vapor pressure:
https://dowac.custhelp.com/app/answers/detail/a_id/7412
Coolant might also reduce the coefficient as well as the driver. The sealing characteristics should be just as good..
Has anyone heard of a sealant w/ coolant already added?
Bret Cahill
Water vapor permeates through butyl rubber 2 orders of magnitude faster than air. You can easily check this with kitchen scales. Weigh a sealant filled front wheel every 2 weeks this summer.
Polypropylene glycol is non toxic and greatly lowers the total vapor pressure:
https://dowac.custhelp.com/app/answers/detail/a_id/7412
Coolant might also reduce the coefficient as well as the driver. The sealing characteristics should be just as good..
Has anyone heard of a sealant w/ coolant already added?
Bret Cahill
Bret Cahill
Jun 18, 2018, 12:09:01 AM6/18/18
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> Tubeless MTB riders complain that sealants like Stan's No Flats must be scraped out and replaced every 2 months. Slime claims it'll work for up to 2 years in an inner tube. After a month on hot asphalt it's already drying out.
>
> Water vapor permeates through butyl rubber 2 orders of magnitude faster than air. You can easily check this with kitchen scales. Weigh a sealant filled front wheel every 2 weeks this summer.
I tried this today and apparently discovered a violation of conservation of matter: The weight _increased_ by 6 gms or 1/4th an oz.
>
> Water vapor permeates through butyl rubber 2 orders of magnitude faster than air. You can easily check this with kitchen scales. Weigh a sealant filled front wheel every 2 weeks this summer.
Either that or the kitchen scales are suspect.
swldx...@gmail.com
Jun 18, 2018, 8:34:11 AM6/18/18
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