The question is.....what is the debris.

Is the debris residue from drilling (poor vacuum, etc.)?
Is the debris from your sanding media?
Is the debris created when the drill burr is driven into the holes during sanding?
Is the debris being driven into the holes during your high pressure cleaning process?

If you have debris entrapped at the center of 10 to 1 + aspect ratio holes can ever have 100% confidence in
clean holes at electroless?

Best advice: eliminate burring at drill / don't sand your panels / keep the holes clean

Vickie Dycewicz wrote:

> I am looking for information on what companies are using to remove debris in
> holes before the electroless deposition (dep) process.
>
> We are getting pth voids in holes due to drill debris still in the holes after
> deburr, before dep. Cross section pictures of the pth void show a circumfrential
> void, near the center of the hole. The electroless copper leading up to the void
> is very granular, as if trying to dep over debris. I do not classify them as
> bubble voids because of the debris still left in the hole.
> I predominately see these voids in 0.022 holes, 0.261 panel thickness.
> After drill the panels are hand sanded, then through our deburr process which is
> an IS Scrubbex with 350psi high pressure spray section.
>
> I would greatly appreciate any suggestions on how to improve my process.
>
> Thanks,
> Vickie Dycewicz
> Electroless Deposition Process Engineer
> Teradyne, Inc.
> Nashua, NH
>
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