Electronics Forum | Tue Sep 07 17:12:34 EDT 2004 | davef
No one knows what type of board you use. So, assuming you're talking a fairly standard FR4. Q1a. actually, what is max temperature and duration can a bare PCB reflow without any quality problem? A1a. We'd guess your board could take 250*C for may
Electronics Forum | Wed May 07 17:52:36 EDT 2008 | wayne123
I have these boards that are a four layer FR4 material, we had been running them for quite awhile with no trouble, and then they started delaminating, I checked my Reflow oven profile and I was barely hitting the temps required for our paste, we then
Electronics Forum | Fri Jul 30 19:58:28 EDT 1999 | ScottM
| | | Hello Netters, | | | | | | I have a customer who wants us to aquaeos wash a PCB after all operations have been performed. The PWB is two layer FR4 with a Transformer, a Multichip Module with Conformal Coating, (6) 11" insulated wires that are
Electronics Forum | Wed Apr 08 11:05:53 EDT 2009 | boardhouse
Hi, Need a little more info, 1) this board is definitely delaminated 2) this board looks like a Std FR4 board with 63/37 Hot air finish with probably 140 tg. material. Was this reflowed under lead free temps? 3) Do you Pre-bake product 4) What
Electronics Forum | Mon Feb 15 15:33:47 EST 1999 | Earl Moon
| Any info on the pros and cons of FR4 or Polyamide ref the use of soldering PGAs would be helpful. ie. temp co-efficient diffs, baking, wave soldering, Convection reflow etc | I'm sure you know all the basic differences as Tg, X, Y, and Z expansi
Electronics Forum | Wed Apr 23 19:00:39 EDT 2008 | stevek
It depends on the laminate but a PWB is like any other MSL component. Some fab shops are only waranting standard FR4 laminates for 45-60 days when processed at lead free temperatures. The best thing I can say is to try some weight gain/loss experim
Electronics Forum | Tue Mar 09 12:13:27 EST 2004 | Gabriele
I want just to confirm what Dave suggested you. J-STD-033a, par 6. Boards Rework tells you plenty of useful informations. 6.1 Component removal, RWK and remount 6.1.1 Removal for Failure Analysi 6.1.2 Removal & Remount 6.2 Baking of Populated Boar
Electronics Forum | Fri Dec 01 14:12:50 EST 2000 | Jim M.
My company currently uses water soluble paste for our SMT process. We were having trouble retaining hot water in our in line, closed loop DI cleaner. The cleaner kept shutting down when the water temp. dropped below 125C. As a result, the conveyor
Electronics Forum | Wed Oct 25 12:24:02 EDT 2000 | Philip
Hi Chris! I hope this will help you! The CBGA uses an array of high melting point solder spheres(Sn10/Pb90) to connect its ceramic chip carrier to an epoxy glass (FR4) PCB using eutectic (Sn63/Pb37) solder joints at both ceramic and card inter
Electronics Forum | Mon Jan 08 18:58:27 EST 2007 | Mike F
Normally someone would have replied to tell you to do a search of the archives. I've read at least 4 or 5 different threads dealing with baking out PWB's, but none were for this special material. First, have you contacted the manufacturer of the PW
