PCBs (FR-4) are glass reinforced epoxy, not polyester (I think the old,
brown ones (SRBP) are paper reinforced urea-formaldehyde). Also the
resin component is cross-linked, whereas the article is talking about
thinning the uncured (un-crosslinked) resin. (Glass reinforced polyester
is used in car body repairs because it is cheaper than epoxy.)
I'm not saying that acetone is a good thing to use on electronics, only
that the rationale in relation to PCBs is flawed.
Incidentally, methanol, an alcohol, softens, but doesn't dissolve, cured
epoxy.
--
David Woolley
Owner/builder K2 06123
On 08/09/15 00:02, Fred Townsend wrote:
From Wikipedia:
Acetone is a good solvent for many plastics and some synthetic fibers. It is
used for thinning polyester resin, cleaning tools used with it, and
dissolving two-part epoxies and superglue before they harden. It is used as
one of the volatile components of some paints and varnishes.
Polyester resin, also called gel coat, in case you don't know, is the stuff
PC boards are made of. Leave acetone in the paint department where it
belongs. I suggest alcohol, any kind as long as it pure, be used for
de-fluxing PC boards.
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