<<  1. What is "Copper mirror corrosion test"  ?

The copper mirror corrosion test is outlined in ANSI-J-STD-004.  The test
sample is a glass slide with a thin film of copper vacuum deposited on the
surface.  Three drops of the flux are placed on the slide for a set amount of
time.  A benign flux will not eat through the copper, a moderate flux will
partially eat through, and an active flux will eat totally through.  

>> 2. Whether this test needs to be done for "water soluble flux" used for
wave soldering ?

It is generally accepted that water soluble fluxes, as active fluxes, will
eat through the copper, thus failing this test.  If you are using a flux
which has been qualified to J-STD-004 or MIL-F-14256, the vendor should
already have these test results available.

>> 3. What are the other tests which need to be done before using the water
soluble flux for wave soldering ?

It depends on what your goals are and what your customer wants.  If you are
manufacturing to old contracts for military, you may need to do MIL-STD-2000A
testing before you can make such a change.  For commercial customers, testing
to ANSI J-STD-001 would be a minimum recommendation.  It all depends on what
your customer or your management considers to be an adequate demonstration
that the new process is acceptable.  For right now, I would suggest that you
use J-STD-001, the A revision, since the B revision qualification scheme has
a few bugs that need to be worked out.

Doug Pauls
CSL

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