I understand what you mean about these types of tests. For years, I have have been questioned about ionic cleanliness that seems to fluctuate with no process changes.
I was tasked to perform the test by a customer that read IPC-FC- 250, which "required" the test for qualification. Since the device is implanted, any contamination is questioned. I will take your advice and consult outside analysis if necessary.
Thank you
Dave
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