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        Hi Sona:
        I would use some scrap board and place different parts of it
over the fountain at different times ( seconds ) to get your limit. When
the material starts to darken or delam, that time is the limit. I would
stay under the limit. FR4 should be good for about 6 seconds at 500F. It
all depends on the fabricator.
        Regards,
        Ramon  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fineline Circuits,
Inc
Sent: Thursday, October 06, 2005 2:13 PM
To: [log in to unmask]
Subject: [TN] Dwell Time

TechNetters,
I have to provide a length of time we can hold a board (FR4) over a
solder fountain (to remove a Pin Grid Array) before the board gets
damaged.
I need to know what that dwell time is.
Thanks,
Sona Sitapara
Fineline Circuits Inc.

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