Hi all,

        We had run the OSP finishing for more than one year now. One
     frustating problem that I can never get rid of is the stain on the OSP
     surface.

        It looks like some kind of water stain. It occurrence is
     independent of acid clean, microetch, OSP bath temperature, process
     speed, final DI rinse pressure, etc. In fact, I cannot find any
     process parameter that can change the appearance of this stain.

        We are using Enthone Entek OSP. The thickness, as determined by
     spectrometer, is 30+/-10 micron. Solderability test is perfect. No
     complaints from any customer concerning the quality of the OSP
     coating. But this stain is very irritating.

        Can somebody tell me how to eliminate the stain?

     Regards,

     Yee T.G.
     Process Engineer
     Hadco Corp.

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