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Author Topic: 70% Isopropyl Alcohol  (Read 2045 times)

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Offline SheldonC

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Re: 70% Isopropyl Alcohol
« Reply #30 on: July 04, 2017, 01:06:06 am »


I also use ipa, which is readily available from a local electronics store here in Australia.

Almost 100%!
  I'm reminded by this post that ethyl alcohol (what you find in your best cognacs & single malts) is/was manufactured by BP Chemicals, who never advertised it as 100% pure, because the product is hydrophyllic - i.e. it readily absorbs water, even the moisture in the atmosphere.  If I remember correctly, they sold it as "99.5% pure", because they either couldn't guarantee they could remove all the water or they knew that anything that came out of their distillery @ 100% purity would absorb moisture before it reached the end user.  I expect other alcohols (such as methyl or isopropyl) have a similar propensity for water absorption

Offline SheldonC

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Re: 70% Isopropyl Alcohol
« Reply #31 on: July 04, 2017, 01:35:50 am »
When I said "hydrophilic", I suspect I should have said "hygroscopic"; mea culpa.

Online austinbob

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Re: 70% Isopropyl Alcohol
« Reply #32 on: July 04, 2017, 08:16:36 am »
Here's some data I posted earlier in this thread - just a reminder.
http://www.ngaugeforum.co.uk/SMFN/index.php?topic=37820.msg448703#msg448703

Cheers
 :beers:
Size matters - especially if you don't have a lot of space - and N gauge is the answer!

Bob Austin

Offline RichardBattersby

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Re: 70% Isopropyl Alcohol
« Reply #33 on: July 20, 2017, 09:35:46 am »
This is likely to be a stupid question, but, presumably by buying a lower concentration, we're less likely to see damage to the aforementioned plastics and paint?

Also, can anyone repost the plastics list with examples of where they would be found in our modelling world? E.g loco body = PVC, bogies = styrene etc. As I've absolutely no idea what is made from which plastic.
 :thankyousign:
Richard
Askham Battersby MKII - NE/Midland Modular Layout

"We don't stop playing because we get old, we get old because we stop playing."

Online austinbob

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Re: 70% Isopropyl Alcohol
« Reply #34 on: July 20, 2017, 09:45:11 am »
Not a silly question Richard. 70% IPA is just as dodgy as neat IPA (if there is such a thing) IPA is hygroscopic which means it absorbs water, even from the atmosphere. I believe it stops absorbing water between 60% and 70% concentration. So even 'neat' IPA is likely to lose some of its concentration on contact with the atmosphere.
As for your second question, I don't know what sort of plastics are used in models, maybe someone else can help with that. However I think damage to paint is much more likely than damage to most plastics.
 :beers:
Size matters - especially if you don't have a lot of space - and N gauge is the answer!

Bob Austin

Offline RichardBattersby

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Re: 70% Isopropyl Alcohol
« Reply #35 on: July 20, 2017, 09:53:58 am »
Perfect, thank you! :)
Richard
Askham Battersby MKII - NE/Midland Modular Layout

"We don't stop playing because we get old, we get old because we stop playing."

 

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