BEFORE YOU COMPLETLY RE-INVENT THE WHEEL CHECK FOR CONTAMINATED RINSES IN
YOUR ELECTROLESS LINE, IN PARTICULAR FOR ACID LOVING ALGAE BEHIND THE
PALLADIUM OR ANY TYPE OF SUSPENDED MATTER IMMEDIATELY PRIOR TO ELECTROLESS.

Robert E. Welch
Process Specialist
Waytec Electronics Corp.
Phone 804-237-6391 ext. 138
Fax   804-237-3048

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Vickie Dycewicz
> Sent: Tuesday, February 02, 1999 12:03 PM
> To: [log in to unmask]
> Subject: [TN] Removing Debris from Holes before Electroless Deposition
>
>
> 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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