I would not recommend any conformal coating that is spray deposit but I
would consider pyraline coating process after installation. Repeated flexing
will cause cracking and peeling off from the Kapton. Also may consider some
type of surface prep to rough up the flex material to enhance the bond
strength.
Thank you,
Jim Mahoney
Quick Turn Flex Circuits, LLC
Applications Project Manager
P# 603-821-6571
F# 603-821-5723
M# 603-305-6250
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roberts, Jon
Sent: Wednesday, September 03, 2008 5:42 PM
To: [log in to unmask]
Subject: [TN] FLEX CIRCUIT AND CONFORMAL COATING
Does anyone know what IPC spec that addresses if flex circuit between
two rigid boards can or cannot have conformal coating? I found Design
spec IPC 2223 that addresses in paragraph 4.4 that it generally should
be free of conformal coating due to make it stiff or debonding of the
coating. Not sure what coating that is referring. Any ideas, thanks in
advance, Jon
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