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April 2005

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Subject:
From:
"Mcmaster, Michael" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Mcmaster, Michael
Date:
Thu, 21 Apr 2005 08:40:37 -0700
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Which Rogers material is this?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord
(KC/EMW)
Sent: Thursday, April 21, 2005 7:49 AM
To: [log in to unmask]
Subject: [TN] Copper traces too, but Rogers this time

Hi all,
anyone who have this experience?
A. Peel fresh PWB: high force needed, white stuff left on board. Soft like
butter. Copper underside yellowish.
B. Peel used PWB: much lower force needed, no white stuff left on board.
Copper underside brown-blue-redish.

Reason for asking is this. We suspect that something bleeds out from beneath
the copper traces during the
VIGON cleaning. Not much, but sometimes creating kind of 'grease' along the
copper traces. Therefore, I'm
interested in the interface between the copper and the teflon. What stuff
can there be that changes from white to colourless, and may be dissolved by
VIGON.

Sending two pics to the always and amazingly tolerant, patient and positive
S.G.

Ingemar Hernefjord
Ericsson Microwave Systems

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