we are using a flux that leaves a non-corrosive, non-conductive residue. i
was wondering if there were specific IPC standards that covered this or the
general standard is to remove allflux, no exceptions.

**Kevin,
ANSI/IPC J-STD-004 covers the flux material itself and is independent of
your usage.  Each flux has a four alphanumeric designator.  The third alpha
in the chain indicates how active or how corrosive the flux is.  L = Low
Activity, M=medium activity, H=high activity.  The last designator is
either 0 (no halides) or 1 (halide containing).

If you are talking about flux that is left on the assembly, then you
probably want to look at J-STD-001.  Unfortunately (in my opinion) the
standard basically says that cleanliness is whatever you agree to with your
customer.  So what flux residues you leave on the assembly and how much
residue is between you and your customer.

Doug Pauls
Rockwell Collins

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