Electronics Forum | Fri Dec 17 02:43:24 EST 2010 | grahamcooper22
Ideal storage conditions to stop pcbs absorbing moisture is at less then 5% RH, for example in sealed moisture barrier bags. You mention that storage was at 40~70%...at these levels the pcb will absorb quite a bit of moisture. Your baking time was no
Electronics Forum | Fri Dec 17 03:26:04 EST 2010 | kemasta
Thanks. If based on your statement, I can understand why it still can absorb moisture. But the PCB supplier was suggested us to keep at 40%~70% RH, if any issue occur with the storage condition of less than 5% RH, I think it is difficult for us to ge
Electronics Forum | Thu Jan 13 17:46:04 EST 2011 | davef
We've never seen the defect that you describe, but in wave soldering-land blowholes usually are caused by moisture in the board that out-gasses through the too thin plating of through holes. * Bandaid fix: bake the boards * Long-term fix: Obtain boar
Electronics Forum | Fri Apr 15 14:25:57 EDT 2011 | ryanr
We've received in a batch of ICs (Xilinx FPGAs) from a customer on consignment that are having wetting issues. I believe the chips are contaminated. We also know that the chips were bought from a broker. Is there a method to remove the contamination
Electronics Forum | Mon Jun 13 09:25:58 EDT 2011 | milroy
Hi I have seen some of our multilayer PCBs are having delamination issues even after baking them in the ovens. Does anybody faced this issue before? The problem occured after reflow process and wave solder process as well. The temp profiles are well
Electronics Forum | Mon Jun 13 12:58:10 EDT 2011 | deanm
We find it is a bigger issue in the summer when there is more humidity in the air even though our facility is air conditioned. We've also seen similar boards go through the same process and vendor A has problems and vendor B doesn't, so fabrication t
Electronics Forum | Thu Aug 04 07:50:49 EDT 2011 | mosborne1
Thanks Dave - IF you look ath the Fancort RA-18HT. This is a high temp plastic that will handle 350 F. This is what we need, but in the 8 1/2 by 20 size. No one seems to make them now. We are a bare board manufacturer as well se wee bake boards at hi
Electronics Forum | Mon Oct 17 10:14:32 EDT 2011 | swag
Do you have cal. fixture(s)? If not, one 1/2 baked way to get yourself closer quickly is to go into your programs and write down your x/y offsets that you've gained during vision offsets while in production. Compare them - hopefully they are very s
Electronics Forum | Fri Jan 13 13:22:34 EST 2012 | mosborne1
I would recommend that you turn toward your PCB supplier probably China and talk to them. You should always bake your boards if this occurs. If you purchase them form a trusted source you should store them in a McDry until you use them if possible. I
Electronics Forum | Mon Mar 19 13:44:13 EDT 2012 | vinod
If PCB supplier has stored PCB in complete IPC specified storage condition and let say they kept for 2 Years. Are these PCB still good for use? I understand about shelf life and baking procedure but I am not sure how long PCB are good for use if they
