Isopropyl Alcohol - 70% or 91%?

Discussion in 'Off Topic' started by FelixDeCat, Sep 12, 2009.

  1. FelixDeCat

    FelixDeCat Lifer

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    So Ive been a user of 91% Isopropyl (rubbing) Alcohol for various purposes for several years now and recently made the mistake of purchasing 70%. I had forgotten how weak this variety was and was disappointed when a strong aroma did not pierce of air when I opened the bottle. Furthermore, Im afraid that because it wont leave extremely dry skin behind that it is in fact not really "working". I have to see it to believe it! And I want to see the bodies of dead germs everywhere including collateral damage to supple skin surface.

    Does it matter to you either way what type of alcohol you use? Or are you an indifferent middle of the road type, just going through life in a happy-go-lucky fashion not really caring if the job was done or not?
     
  2. Leros

    Leros Lifer

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    I've always used 91% for cleaning thermal compound off my CPUs. I don't use rubbing alcohol for medical reasons too much.
     
  3. her209

    her209 No Lifer

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    70%? Wimp!
     
  4. Martingale

    Martingale Diamond Member

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    Wow, I've never seen such lopsided poll results.
     
  5. FelixDeCat

    FelixDeCat Lifer

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    Ive used it for that reason too. Unfortunately now I have to use the 70% bottle I accidently purchased the other day. No sense in pouring $1.49 down the drain. :(
     
  6. Cogman

    Cogman Lifer

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    For medical stuff, it really doesn't matter. 70% will kill 99.99% of everything on the skin.

    The only reason to go with 91% is if you are cleaning something that can't get wet.
     
  7. FelixDeCat

    FelixDeCat Lifer

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    Hmmm.....what are some things you cant get wet?
     
  8. Cogman

    Cogman Lifer

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    Electronic circuit boards. Anything that rusts, There could be other things, but those are the two that comes off the top of my head.
     
  9. Vinny N

    Vinny N Platinum Member

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    Best I ever used was 99% from a chem student :p

    Of course, they suggested that I use their "water" (aka acetone).

    I was even more wowed. As long it's not plastic that is going to be melted away acetone is awesome for cleaning cpus and other goodies :p
     
  10. FelixDeCat

    FelixDeCat Lifer

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    Thanks for the suggestion! But I prefer to biosynthesize small amounts in my own human body. :shocked:
     
  11. MotF Bane

    MotF Bane No Lifer

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    91%, all I use alcohol for is cleaning computer parts.
     
  12. kami333

    kami333 Diamond Member

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    Actually 70% isopropyl is a better disinfectant. Alcohol works as a disinfectant by denaturing proteins, a small amount of water makes it more efficient.
     
  13. Bill Brasky

    Bill Brasky Diamond Member

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    I use ethanol to do cleaning in the lab when I'm feeling lazy and don't want to use proper detergent. But usually alcohol is reserved for computer parts. 91%.
     
  14. troytime

    troytime Golden Member

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    91% burns so much better
     
  15. 0roo0roo

    0roo0roo No Lifer

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    i use 70-91 for cleaning stuff like hs paste. 50% dilute to spray on screens for cleaning.
    so what do you rub it on your skin for anyways? whats the point.
     
  16. DrPizza

    DrPizza Administrator Elite Member Goat Whisperer
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    So how many bacteria are there if 0.01% survives? And, if you start with 2000 bacteria that double every 15 minutes... How long til it didn't matter in the first place? :p ;)
     
  17. DLeRium

    DLeRium Lifer

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    I use 91 or 99% for cleaning stuff on computers...
     
  18. DanTMWTMP

    DanTMWTMP Lifer

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    LOL @ thread. But there's quite a bit of cool info too.

    That's interesting. I never knew.


    I've always got 91% to clean my balls and, sometimes, my arse (I had a cut down there once. I figured, that having my dump cover up the wound wasn't a good idea, and it's a good idea to disinfect it). The burn was incredible. I doubled up in pain on the floor, but never felt so refreshed, knowing all those bacteria was dying and screaming.
     
  19. her209

    her209 No Lifer

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    Wow. Too much information!
     
  20. FelixDeCat

    FelixDeCat Lifer

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    My thoughts exactly. :laugh:

    But Ive had to apply some to the 'cavity' as well, and trust me the pain is incredible but the feeling afterwards is quite refreshing. :)
     
  21. FelixDeCat

    FelixDeCat Lifer

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    I am glad we agree on this point. I have no sympathy for bacteria. I dont care what kind of life they led up to that point. I dont care what their philosphical point of view is. I dont even care where they were born.

    They must die. They must die now.
     
  22. Kobota

    Kobota Senior member

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    well there was this girl, but i was drunk, i did my best:eek:
     
  23. FelixDeCat

    FelixDeCat Lifer

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    Was her name Ellen?
     
  24. Squisher

    Squisher Lifer

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    70% is a better disinfectant than 91%.
     
  25. 0roo0roo

    0roo0roo No Lifer

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    mermaids?