We solder and assemble products for the commercial and military aerospace
markets (J-STD-001 Class III products).   We have traditionally only allowed
R or RMA fluxes to be used when soldering stranded wires due to the concern
of corrosive elements being entrapped in the wire strands or under the wire
insulation,  potentially relating to a long term corrosion and reliability
problem.   J-STD-001/004 classifies fluxes by L0, L1, M0, and M1 versus the
MIL-STD-2000 classes of R, RMA and RA and there is not a one to one
correspondence.

We are considering the use of organic L0, L1 and M0 liquid flux and flux
cored solder for use with stranded wires.  Has testing been performed to
J-STD-004 requirements with stranded wires with these types of fluxes?  Is
there any reliability impact any over time?  What does the industry
recommend?   There are many factors such as circuit board spacing, pretin of
wires,  circuit impedance, cleaning systems, conformal coating and product
use environment that influence the answers to these questions,  so no answer
is universally applicable.  However,  all relevant information would be
appreciated.

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