Effectively ALL fluxes are synthetic, except for pure water-white wood
rosin, which even may be, if you count distillation as a synthesis.

However, what you may be referring to is "Wally's Wonder Flux" which Dr
W. Rubin of Multicore developed in, I think, the early 1980s or late
1970s. I think the trade name was Xersin. This was like an activated
rosin flux except that the rosin was replaced by a synthetic polymer. It
was possibly the first true "no-clean" flux, because it required a
jackhammer to remove it :-)

Modern "no-clean" fluxes contain little or no resin/rosin and are mainly
a small quantity of dicarboxylic acids in a solvent/vehicle base.

Brian

Glenn Pelkey wrote:
> I must have been sleeping during the whole No-Clean introduction.  I
> thought they were based on similar chemistries as Rosin, but with lower
> solids.  A quick web search shows some are rosin, but most are
> "synthetic resin".  The Resin definition says it is a derivative of
> Rosin.  The MSDS of some say "Petroleum Distillates."
>
> So, can somebody explain what chemistry is in a No-Clean flux?
> What does "synthetic" actually mean?
>
> Thanks,
>
> Glenn
>
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