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March 2000

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Subject:
From:
Alain Savard <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 21 Mar 2000 16:24:08 -0500
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Isn't the 72 hours before bake a requirement for polyimide instead of FR4?

Alain Savard, B.Sc.
Chemical Process Analyst
CAE Electronics Ltd.
e-mail: [log in to unmask]

-----Original Message-----
From: Dewey Whittaker
1. Typically, for multi-layer (6-8 layers), FR4, SMT boards stored in an air

conditioned environment at about 50+/- 10% RH, how many months would you
allow
to pass before you would recommend baking them prior to reflow?
2. What would be your bake cycle?
Thanks,
Charlie B.
####################################
Without knowing any other variables and being conservative,72 hours is your
window for the Aerospace Industry.
Dewey
--
Dewey Whittaker

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