A couple of other things about Tetrahydrofuran.

Exposure to the chemical has been well covered.  However,  the TLV of
exposure in the US is still high for the properties outlined for  Europe.  200 ppm is
pretty high, but my guess is that will be lowered.  Anyway, the internet says
a million pounds a year are used in the US.

THF is an excellent solvent, as Rudy has pointed  out.  I cannot imagine it
will just attack parylene, and not attack the  epoxy of the board, solder
mask/marking inks, and potting compounds on your  discrete components from the
picture of your module. Some of the other solvents  Rudy offered you are either
the stuff for dissolving epoxy so it can be coated  on to glass fabric, or the
solvent used in the multilayer PTH line for removing  epoxy drill smear.

Finally, THF is pretty flammable.   I did not look  up ethyl ether, but if
you use it, pretend you are using starter fluid for a  gasoline engine.

Denny Fritz
MacDermid, Inc.

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