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September 2004

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Subject:
From:
James Hofer <[log in to unmask]>
Reply To:
James Hofer <[log in to unmask]>
Date:
Fri, 10 Sep 2004 12:53:22 -0700
Content-Type:
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However, Were this the case you would see fracturing or voiding of the via.


James Hofer
Director of Operations
Accurate Circuit Engineering
3019 S. Kilson Dr.
Santa Ana Ca. 92707-4202
714-546-2162 work
714-473-6127 cell
[log in to unmask]
----- Original Message -----
From: "Lee Parker" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, September 10, 2004 12:31 PM
Subject: Re: [TN] Blow Holes -- Where the heck does the moisture come from
anyway?


> Carrie
>
> If you cross section the vias, remove the solder from the hole and look
> at the copper barrels at very high magnification (use and SEM if
> possible)you may see pin holes in the copper or glass bundles protruding
> into the hole. This coupled with moisture in the dielectric which is
> normal can create the mechanism. When the board is quickly heated in
> assembly (reflow or wave solder) the moisture is pressurized and flows
> out through the pin holes into the barrels blowing the molten solder in
> the barrels out onto the board.
>
> Best regards
>
> Lee
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Morse, Carrie
> Sent: Friday, September 10, 2004 2:33 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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