Hi all.  I'm hoping to pull on the experience on this list...

Performing a flux evaluation, we performed SIR tests with 8 different
conditions (4 fluxes, 2 temperatures).  The IPC coupons were processed
through our wave soldering/spray fluxing process, doing our best to simulate
regular production.  The fluxes we are evaluating are all VOC free/no
clean/water soluble/low solids/low residue fluxes.

The test was performed to Bellcore standards.

The SIR results we received were lower than expected - ranging from 2.74E+9
to 4.27E+10.   The pass value assigned by the laboratory is 3.2E+10.  Only 3
of 32 samples actually passed this standard.  6 of the 32 samples passed the
Bellcore minimum value (2.0E+10).  What sort of implications can we expect
with selecting a flux with slightly lower SIR results than the minimum
value?  Each of the flux vendors provided their own passing SIR test
results.

One other thing that was noted was that the boards with the fewest defects
came back with the poorest SIR results, and vice versa.  Is this just a
coincidence, or is there a solid explanation for this?

Thanks in advance,

Amanda Mountain

Amanda Mountain
Process Engineering
Leitch Technology International Inc.
Phone: (416) 445-9640 ext. 3852
Fax:  (416) 445-7927
http://www.leitch.com/

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