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1. polprog68k (gorplop@pleroma.m68k.church)'s status on Friday, 03-Jan-2025 09:03:48 JST polprog68k

   • Graham Sutherland / Polynomial
   • Andrew Zonenberg
   @azonenberg @gsuberland Whats the IPA to peroxide reaction? I had no idea it self(?) oxidizes
   • Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Friday, 03-Jan-2025 09:12:21 JST Andrew Zonenberg

     in reply to

     • Graham Sutherland / Polynomial

     @gorplop @gsuberland Secondary alcohols in general are peroxide formers. It's not a fast process (the bottle in question was nearly empty and close to a decade old, frequently opened to use a few ml so there was always fresh O2 in the headspace - basically a worst case scenario WRT reaction speed) and you are unlikely to get enough in the stock bottle to e.g. blow up when the bottle is opened.

     But you can definitely accumulate enough to be a risk if you were to distill to dryness or something.

     I could be wrong but I think IPA is first oxidized to acetone, then oxidized more to form TATP?

     polprog68k likes this.
   • Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Friday, 03-Jan-2025 09:12:33 JST Andrew Zonenberg

     in reply to

     • Graham Sutherland / Polynomial

     @gorplop @gsuberland There might be more to it because I don't remember hearing about ketones being spontaneous peroxide formers (maybe it's only the mix of IPA + acetone that causes the reaction and not pure acetone?)

     I'm not an organic chemist, I just know it can happen and how to test for it. Test strips are cheap, when in doubt I just do the entire solvent inventory and if I accidentally test a non-peroxide-former boo hoo I wasted a $0.50 test strip.

     polprog68k likes this.
   • polprog68k (gorplop@pleroma.m68k.church)'s status on Friday, 03-Jan-2025 09:13:10 JST polprog68k

     in reply to

     • Graham Sutherland / Polynomial
     • Andrew Zonenberg
     @azonenberg @gsuberland thanks, i gotta look for these test strips then
   • Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Friday, 03-Jan-2025 09:15:37 JST Andrew Zonenberg

     in reply to

     • Graham Sutherland / Polynomial

     @gorplop @gsuberland These are the ones I use
     https://xplosafe.com/peroxide-testing/

     polprog68k likes this.