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Offlineauto59009
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Registered: 05/21/01
Posts: 376
Loc: Australia
Last seen: 16 years, 1 month
metho vs iso
    #327535 - 05/28/01 02:40 AM (16 years, 6 months ago)

does anyone know what the difference is between methylated spirits and isopropyl alcohol when used for sterilizing equipment?

does methylated spirits leave a residue or something? the iso seems to evaporate very quickly but i have never tried metho.

thanks a lot!



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InvisibleChampion des Champignons
long standing member;)

Registered: 07/27/00
Posts: 2,679
Loc: Alba
Re: metho vs iso [Re: auto59009]
    #327638 - 05/28/01 05:59 AM (16 years, 6 months ago)

Methanol is a smaller molecule than isopropanol and evaporates faster. It's a more suitable solvent for alkaloid extractions, but make sure you get pure stuff, and only let it evaporate in a well ventilated area, preferably outside, as high levels can dissolve your optic nerves. Not good:crazy:

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Old Donkeys don't die, they go to:
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Offlineauto59009
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Registered: 05/21/01
Posts: 376
Loc: Australia
Last seen: 16 years, 1 month
Re: metho vs iso [Re: Champion des Champignons]
    #327640 - 05/28/01 06:10 AM (16 years, 6 months ago)

maybe i should elaborate a little...

in the US methylated spirits would probably be known as denatured alcohol? am i correct?

i believe this is different to methanol...



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InvisibleChampion des Champignons
long standing member;)

Registered: 07/27/00
Posts: 2,679
Loc: Alba
Re: metho vs iso [Re: auto59009]
    #327656 - 05/28/01 07:31 AM (16 years, 6 months ago)

Methylated spirits is pricipally ethanol, with a hint of methanol to make it undrinkable, but depending on the brand it can contain any number of other aldulterants eg dyes, bittering agents. Denatured alcohol is just ethanol & methanol. At least where I come from.

------------------------------------
Old Donkeys don't die, they go to:
Drool Donkey Island


--------------------
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Offlineauto59009
enthusiast
Registered: 05/21/01
Posts: 376
Loc: Australia
Last seen: 16 years, 1 month
Re: metho vs iso [Re: Champion des Champignons]
    #328416 - 05/29/01 02:05 AM (16 years, 6 months ago)

yeh that would be it cdc!
but do these trace adulterants leave a residue?
i assume isopropyl alcohol leaves nothing behind when it evaporates because it is sold as disinfectant for cuts and wounds where as denatured ethanol is not :)



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OfflineMaddoc
Resurrected!
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Registered: 05/06/01
Posts: 121
Loc: London, UK, Basel, CH or ...
Last seen: 9 years, 1 month
Re: metho vs iso [Re: auto59009]
    #328503 - 05/29/01 05:35 AM (16 years, 6 months ago)

Meths' is unsuitable as its Methanol (usually only at 10%) and water and is not designed for steralization.

Use Isopropyl alcohol at a 90%+ concentration to steralize things. Meth's is really designed to be a paint stripper, Isopropyl is for steralization.

Whoa! Where my Fingers?


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