Kaye we use the following:

Circuit Boards (bare) 104 + 5C 4 hours min; 24 hours max
Circuit Boards (loaded) 104 + 5C 3-4 hours

If I remember correctly this is from J-STD-033 or something like that. You should be able to find
baking temperatures in one of the J-STD's, I just cannot remember which one. I'm sure some in the
forum can help you with that, but this is what we use and it is also what our board fab houses use
as well.

Hope it helps...

CAS

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Kaye Clayo
Sent: Wednesday, April 27, 2005 2:10 PM
To: [log in to unmask]
Subject: [TN] How to Bake FR4 Boards


Dear Technet:

Can someone tell me what temperature and duration
we should bake some unpopulated FR4 (HASL) boards?

We are attempting an experiment to see if we can "bake" a
potential problem out of certain boards, but we don't know
what the baking temperature / time should be.  The potential
problem we are looking to bake out is under cured laminate
which could be causing a hook problem.

Please help.

Kaye


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