Steve -

Good lookin' mess - my first suspicion is organics on the board surface at
the t ime of LPI application; second suspicion is too hot/fast a cure
process, skinning the mask before it could expel its volatiles.  Regardless,
the problem appears to belong to the fab house at this stage.

Regards - Kelly


-----Original Message-----
From: Stephen R. Gregory <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, July 26, 2000 2:17 PM
Subject: [TN] "Bubbly Soldermask..."


>Hi all!
>
>We just got some boards in at receiving inspection that have thousands of
>little "bubbles" in the soldermask all over the boards...they seem to
>concentrate all along the edges of the features of the board. You can see
>pictures of it at:
>
>http://www.driveway.com/share?sid=e25a88c4.8e904&name=Pictures
>
>One picture is bubblemask.jpg, the other is bubblemask2.jpg...what would
>cause that? It's a LPI...don't know the brand name. I'm thinking that
either
>the boards weren't dry or cleaned well prior to soldermasking them. I'm
>rejecting the boards of course...
>
>My freedrive is filling up fast with all the pictures of the "pretty
boards"
>that we get from our vendors!!!
>
>-Steve Gregory-
>
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