We just ran a long time heat run at 175C on a board made with Sn96/4Ag.
The leads turned blue.

I don't have my CRC handy. What caused the blue? Is it silver halide? IS
there another tin oxide I am not aware of which turns blue? Or even
copper?




Paul Stolar
Materials/Reliability Engineer
Manufacturing Reliability Lead Engineer
Baker Atlas
713-625-5376

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