[sdiy] Careful with that old high-proof IPA

Pete Hartman pete.hartman at gmail.com
Sat Jul 1 23:24:43 CEST 2023


The way I read that article, the primary risk is if you were to heat or
attempt to distill the alcohol with the peroxides present.

That said, a little caution goes a long way.

Pete

On Sat, Jul 1, 2023 at 2:35 PM Eric Brombaugh via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Hey folks,
>
> As electronics hobbyists a lot of us will have isopropyl alcohol (IPA)
> around for cleaning circuits and mechanisms. It's come to my attention
> that anhydrous (>99%) IPA left standing for more than a few months is
> prone to forming peroxide crystals that are unstable and potentially
> explosive. Dilute IPA such as what you'd buy at the drug store (70%-90%)
> is safe, but the jug I got at the hardware store is 99% so be aware of
> what you've got lurking in the cupboard. I checked my stash and poured
> in some distilled water just to prevent worries.
>
> More info on that here:
> http://www.sciencemadness.org/talk/viewthread.php?tid=21495
>
> Eric
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