[R-390] How are your knobs ?

[Mike A]

On Fri, May 16, 2014 at 09:30:24PM -0600, Robert Moses wrote:
> A word on acetone: it polymerizes and leaves an organic residue. If you
> want a clean surface wash off the acetone with distilled water and then
> bake off the water film after shaking out the drops that you are able
> to. (Baking would be at about 240 F (120 - 140 C ) for a day or 2. I am
> assuming that you are talking about the 2 larger metal tuning knobs.)
> Before baking non metal parts test to be sure that they will not be
> damaged.

This is interesting. 

I've used it for the final cleaning on lab glass and optics, and my wife, a
chemist, has used it to clean and dry lab glass forever. Neither one of us has
ever heard of any problems with acetone polymerizing by itself on clean glass
surfaces. When mixed with other reagents, though not water, it may polymerize,
and there are articles on this in the literature, but none that I could find
for just acetone by itself or with water.

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin