Depends on how you define aggressive.
In general you could say that the more polar the molecule the more
aggressive to human skins it is.
Iso-propyl in that respect is used in many lotions etc.
However Iso-propyl, is one of the more common solvents in the chemical
industry, and might dissolve the softeners in the foam and rubber like
parts of the camera. (I had to fight this once when I was still into
chemistry). It would not be my choice for cleaning my camera.
Reg.
Maarten
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx
[mailto:owner-olympus@xxxxxxxxxxxxxxx] On Behalf Of John Hudson
Sent: vrijdag 6 juni 2003 14:58
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] Ranking of alcohols by aggressiveness
----- Original Message -----
From: "Joe Gwinn" <joegwinn@xxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Thursday, 05 June, 2003 10:13 PM
Subject: [OM] Ranking of alcohols by aggressiveness
> At 9:54 PM +0000 6/5/03, olympus-digest wrote:
> >Date: Thu, 5 Jun 2003 16:58:37 +0200
> >From: maarten.schulte@xxxxxxxxx
> >Subject: RE: [OM] ethyl or isopropyl
> >
> >I shouldn't use iso-propyl alcohol.
> >The stuff might damage the plastics and rubber parts of the camera.
> >methanol or ethanol are less agressive.
>
> It's the other way around. Isopropyl is the least aggressive of the
bunch.
>
> Basically, the smaller the molecule, the more aggressive the solvent.
The
order is:
>
> Methyl Alcohol (most aggressive)
> Ethyl Alcohol
> Isopropyl Alcohol (least aggressive)
>
> Denatured alcohol is a mixture of ethyl and methyl alcohol, the intent
being to make it undrinkable. It is plausible that this would be called
"methylated spirits" in the UK.
>
> Methyl alcohol is also called "wood alcohol" in the US. Methanol (not
menthol) is the chemical name. For some reason, wood alcohol has
disappeared from hardware stores in the US.
>
> Isopropyl alcohol from drugstores in the US comes in two strengths,
70%
and 91%. The balance is water. The 91 0s the strength to use on
cameras.
Not that it matters; I have never succeeded in dissolving adhesive gunk
with
isopropyl alcohol, though it does work with oil and dirt.
In Canada the 99% version is widely available on drug store shelves.
jh
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