Electronics Forum | Tue May 28 22:06:09 EDT 2002 | arcandspark
Two hours at 125 C will do nothing. IPC's new spec is 48 hours at 125C, the old spec I use to use for years was 24 hours at 125C. I do not have all the spec in front of me but if you reduce the temp to around 60C it can take up to 48 days. We use to
Electronics Forum | Tue May 28 22:06:18 EDT 2002 | arcandspark
Two hours at 125 C will do nothing. IPC's new spec is 48 hours at 125C, the old spec I use to use for years was 24 hours at 125C. I do not have all the spec in front of me but if you reduce the temp to around 60C it can take up to 48 days. We use to
Electronics Forum | Sat Jan 08 08:50:35 EST 2005 | davef
Normally, you should not have to bake boards that are properly packaged and stored. Since you are seeing problems, baking makes sense. Consider 125C for 4 to 6 hours. Additionally, look here for more, while waiting for others: http://www.smtnet.
Electronics Forum | Fri Jan 07 07:36:14 EST 2005 | dansmall
I have a Polyimide board that is showing signs of de-lamination. I was wondering what pre-bake times and temperatures other people would recomend for new boards as well for boards that have been on the shelf for 8 months.
Electronics Forum | Wed Jan 12 10:05:20 EST 2005 | Dreamsniper
we are using polyimide boards 6 inches x 7 inches, 2.5mm thick, 12 to 14 layers, for aerospace industries. I am using a long bake of 12 hours at 70'C prior to manufacturing or exposure to elevated reflow and wave soldering temperature. If schedule i
Electronics Forum | Wed Aug 23 11:56:09 EDT 2006 | aj
rgd's aj...
Electronics Forum | Fri Jan 13 08:59:29 EST 2006 | james
We built some boards with incorrect Bgas and we had to pull the bad ones off. I need to know if we need to bake the boards before we add the correct BGAs on and resend through the reflow? We need to get these boards shipped asap after we install th
Electronics Forum | Thu Aug 24 15:54:13 EDT 2006 | davef
It depends. What is: * Storage environment and period * Board laminate, epoxy, and copper thickness of PTH * Down stream process * Etc FR4 0.062" thick boards absorb between 0.08 to 0.1%Wt of moisture within a 24 hour period, and 0.2 to 0.23%Wt in
Electronics Forum | Fri Aug 25 07:42:29 EDT 2006 | davef
Our sympathies about the ENIG boards. B:) So, you cut the end off the barrier bag, take 200 boards, heat seal the end of the bag and restock it, build the 200 boards and ship them, right?
Electronics Forum | Mon Aug 28 07:28:07 EDT 2006 | davef
Mr Jarvis One experience with black pad makes you promise never to use ENIG again. It's nice that you have a supplier that has avoided that problem.
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