Re: [ATM] optics cleaner

[Mark Holm <mdholm@telerama.com>]

James Gort wrote:
> The MSDS page was for "flexible collodion".  The ATS page (oldscope)
> specifically cautioned against the flexible kind - use only 'Collodion
> USP'.  The MSDS for that is
> http://www.jtbaker.com/msds/englishhtml/c5060.htm
> 
> There's no castor oil in that one.

Good point.

The flammability issue is still very real though.  That flash point of
less than negative 26F and the explosive limits of 1.9 to 36% are pretty
scary.  Wide explosive limits are always a bad sign and flash points
below zero in either scale mean avoiding a flammable vapor situation is
practically impossible.   Put it this way:  I am, by training and quite
a few years of employment, a lab chemist.  I'm not going to be using
collodion dissolved in a high ethyl ether solvent in my home or shop,
and if I were going to use it in a lab, I would be sure to use it in a
good fume hood with ignition sources carefully excluded.  That is how
smart chemists get to be old chemists.  (I may not be the former, but I
am much nearer the latter than I would like.)

Mark Holm
mdholm@telerama.com


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