The most common cause I have found is very thin or voids in the plating. I
have two different boards that are sent from the PWB manuf. To another place
for silver immersion. One has a problem the other is fine. When we first
noticed this I looked down the barrels , and while I could not see any voids
I can clearly see the layers.
-----Original Message-----
From: Morse, Carrie [mailto:[log in to unmask]]
Sent: Friday, September 10, 2004 1:33 PM
To: [log in to unmask]
Subject: [TN] Blow Holes -- Where the heck does the moisture come from
anyway?
Just wondering a few things here at 2:30 on Friday Afternoon:
1. What else causes Blow Holes at wave on TH comps? Is it primarily
moisture?
2. Where does the moisture come from?
3. Are certain board materials more likely to sponge up the moisture in
the air?
4. Can hole wall quality play a part in contributing to blow holes?
-Carrie
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