Nicholas -

The root cause of pin holes in the plated thru hole wall generally goes back
to the cleaning and activation of the hole or the electroless deposition
process.  Check these processes and chemistries very carefully.

As Gaby noted - the result is often an entrapment of chemicals which has an
adverse affect on solderability.  These entrapments also have a habit of
blowing bubbles during the wave soldering process, resulting in solder
eruptions and voids, for which there is no permanent cure, and the product
ends up in the scrap bin.

Regards and good luck - Kelly
-----Original Message-----
From: Nicholas LAI <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Friday, September 17, 1999 11:09 PM
Subject: [TN] Poor solderability


>Hello all
>
>Is there anyone can give me some info of pin hole in PTH.
>Our end-customer complain that there is poor solderanility of our product.
>After micro-section teh problem hole. there is some pin hole on teh PTH
wall. Is
>this is teh root cause of the poor solderability.
>Any comment?
>
>
>More, is there any reasons can cause poor solderability(non-wetting)?
>
>Is there any good source can know more about the poor
>solderability(non-wetting)?
>
>Best Regard,
>Nicholas Lai
>9/18/99
>
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