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Subject:
From:	Stephen Gregory <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:	Wed, 8 Jun 2005 11:07:39 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (48 lines)

Hi All!

My turn to post a picture today...hehehe.

Have this very strange problem with my good ol' freind
dry film soldermask...eh, what's new?

Take a look at; "Mask Blisters, and Mask Blisters 2" on
my page at: http://www.stevezeva.homestead.com

These are very little tiny blisters on the backside of a built
assembly. The board was baked and it was wave soldered.
The blisters don't appear on the topside of the board at all.

The soldermask is Dupont Vacrel 8140. The little blisters appear
everywhere there's been touch-up done. It's not just around the
solder joints, but it looks like the blisters appear where ever flux
has contacted the mask.

The liquid flux that we use for touch-up is Alpha 615 RMA.

What in the world could cause this sort of thing?

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
__________________________________________________________________
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If you are not the intended recipient, you may not copy, use or deliver
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