In my opinion slight colouration differences between batches is not abnormal
but I do mean slight. I would need to know the material build to determine
if it could be a problem. Regards Steve Kelly

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Houston, Terri
Sent: Thursday, April 11, 2002 8:55 AM
To: [log in to unmask]
Subject: [TN] Coloration differences between batches of flex circuits


Hi folks,

We recently received a batch of 3-layer flex circuits, which were much
darker in color from the previous batch received (think copper colored vs.
chocolate colored).

I was told that the darker batch received a longer bake and that the
coloration difference was cosmetic.

Since I don't have a lot of experience with flex, I'm looking for input from
flex manufacturers/users on whether color differences between batches are
common and acceptable.

Thanks in advance,

Terri

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