Hi Steve,
In my experience not feasible. If you want an independent opinion ask DuPont
but I think they will give you the same answer. Good luck. Steve Kelly

PFC Flexible Circuits Limited
Ph: (416) 750-8433
Fax: (416) 750-0016
Cell: (416) 577-8433
E-Mail: [log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Gregory
Sent: Thursday, June 02, 2005 6:36 PM
To: [log in to unmask]
Subject: [TN] Dry Film "Soda Strawing"...an update.

Hi all!

We just had a conference call with the fab vendor about our soda strawing
issue.

They acknowledged that the fabs are defective, but asked for a deviation
to notes on the fab drawing. We can't approve any deviation without asking
our customer first.

The drawing calls out for 4-oz copper, and 4-mil dry-film solder mask. The
mask being used is Dupont Vacrel 8140. The assembly is a power supply.

They want to apply a LPI, then apply the dry film. I understand that
applying
a 4-mil dry film over 4-oz. copper traces is difficult and challenging, but
can
it be done without these kind of soda strawing defects?

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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