At 4:05 AM +0000 6/7/03, olympus-digest wrote:
>Date: Fri, 6 Jun 2003 22:45:10 +0200
>From: "Maarten Schulte" <maarten.schulte@xxxxxxxxx>
>Subject: RE: [OM] Ranking of alcohols by aggressiveness
>
>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.
My definition of aggressiveness hinges on its effect on common plastics.
The basic pecking order, starting with the weakest, is: alcohols (isopropyl,
ethyl, methyl), MEK, acetone, methylene chloride.
The active ingredients of many paint strippers are methylene chloride and
methyl alcohol, sometimes plus acetone and/or toluol. I don't know if there is
a technical reason for the sometimes ingredients, or it's just what's cheap
that week.
>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.
I would think one would have to soak the foam or rubber in the isopropyl for
this to be a danger, even if the uncured precursors of the foam and rubber
would dissolve in isopropyl.
Joe
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