Hi Joe!

Asking the question indicates you probably have a problem.  I don't
have good news.

The document you want is IPC?JEDEC J-STD-033

It grades bakeouts with respect to moisture sensitivity.  Tables are
given for time/temperature.  No vacuum information is in this document.
The problem is that the hottest you can take something like a reel is
40C--don't leave one in your hot car!  I've tried 80C and they get
seriously warped-unusable.  This pushes the bakeout time into the
MONTHS!  You're usually better off by paying a taping house to de-tape,
dry, and re-tape.  Probably can be done for about $100/reel.

Wayne Thayer

>>> [log in to unmask] 9/8/2006 1:33 pm >>>
Tech,



Hello. Friday is a great day of the week especially when it is our off
Friday like next week (we are on a 9/80 work schedule)!



Questions - where can I find information on common industry practices
to
re-bake MSDs already packaged in tape & reel or tubes? Some say it is
feasible at low temperature with a vacuum oven while others say that
even
this practice may cause component release issues from the tape during
automated smt assembly.



Also, what temperature(s) are tapes, tape & reels and tubes normally
rated
at? Is there an IPC spec that addresses this issue?



Thanks again

Joe




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