Hi ya'll!

Here's something weird I've never come across, but maybe some of you have. We
built this Hi-Rel board here that the PCB drawing calls out for 2-ounce
copper.

The board has this leaded SMT multi-capacitor part (it's like 3 huge ceramic
capacitors stacked on top of each other) and has 8-leads. After assembly, and
before we test then conformal coat it, we put the assembly on this vibration
table to go through some ESS.

There's been a few of these capacitor deals come loose because they're so top
heavy, but that's a whole 'nuther issue...

What we've been seeing on some of these boards, is that either the pad
completely lets go from the laminate (it's a polyimide), or sometimes we'll
see the pad come up in what looks like a layer of copper, yet there's still
copper down on the PCB...as if the copper has split horizontally in two
distinct layers? Is this possible? Does 2-ounce copper clad laminate get the
copper plated an ounce at a time? Is this a defect? I've never seen something
like this before, and I can take a picture and send it to ya' if you want me
to....

Thanks!

-Steve Gregory-

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