Steve,

Looks like the pre-clean prior to the solder mask application was not
properly. The copper looks shinny which it should not if the boards have
been either chemically or mechanically cleaned. Since there is a lot of
copper that it has to stick to, the cleaning process is critical. The mask
look like it is fully cured but difficult to determine that from a photo.

My thoughts

Scott Westheimer
Colonial Circuits
----- Original Message -----
From: "Steve Gregory" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, January 13, 2004 4:01 PM
Subject: [TN] "Snake Board"...


> Hi All!
>
> You're probably wondering; "What the heck? Snake board?" That's what I
call
> it.
>
> Built this assembly (all PTH), waved it, and then washed it, went to get
it
> out of our cleaner, and all the solder mask is coming off in big slabs
just
> like a snake does when he sheds his skin! Go look at "Mask Peel, Mask Peel
2, &
> Mask Peel 3" at:
>
> http://www.stevezeva.homestead.com
>
> I wash in a Electrovert MCS-1000 with Kyzen XJN, and the mask on the board
> was a Dupont Vacrel dry film. Never have had a problem with Vacrel dry
films.
>
> The mask doesn't look degraded, or damaged in any way...it's just not
stuck
> to the board! Anybody ever seen this happen before? Unfortunately, this
was a
> rather expensive assembly.....:^{
>
> Nice way to start the year off, huh?
>
> -Steve Gregory-
>
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