John,
I have had previous experience of immersion silver coated PCB's in place of HASL coated type using no-clean processing with little or no problem at all. All of the process parameters were left unchanged.
There is a very minor difference in the amount of wetting compared to HASL but much less than using an electroless nickel/immersion gold finish (assuming you use the same solder paste/flux type and process settings).
Benefits of the silver process are the flatness of the pads (same as gold). Also the bare PCB manufacturing process is less aggressive as the coating process does not require the high temperatures used in HASL and the process chemicals are much less environmentally harmful than those used when applying gold.
I understand that the shelf life is pretty good too.
Pete B.
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