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 | Thu Aug 21 16:00:31 EDT 2014 | davef
This links to a NPL presentation on moisture removal from PCB http://www.npl.co.uk/upload/pdf/20140318_effect_baking.pdf Consider: * Focusing on preventing moisture contamination of boards, rather than removing moisture * There will be no standard
Electronics Forum | Wed Jun 18 07:26:42 EDT 2003 | rmurtuza
Do BGA packages absorb moisture to a great extent if kept exposed to an atmosphere of 300C and 60% relative humidity overnight? Should they be backed before reuse. How long can they be kept exposed without the requirement of baking. Are there any spe
Electronics Forum | Mon Apr 26 22:55:53 EDT 2004 | CT
Hi, I'm setting up a procedure for Moisture sensitive IC rework. Would like to understand what is the baking requirement for a board before a moisture sensitive IC can be remove from a board.
Electronics Forum | Mon May 16 15:53:17 EDT 2005 | adrian_nishimoto
This has been a problem with new components coming directly from vacuum sealed desiccant packed moisture barrier bags with moisture level cards. We have also baked all boards prior to the BGA rework to ensure no moisture issues were addressed.
Electronics Forum | Tue Jan 06 14:37:27 EST 2009 | stevek
The easiest way to prove out the absorbtion theory is to weigh the parts before wash, after wash, and after baking. You probably want to do this with the bare parts in isolation as the fab will pick up considerable moisture. Differences in weight s
Electronics Forum | Sat Apr 27 15:42:53 EDT 2019 | davef
Your ppl are correct, the capacitor is not sealed. So, it is perfectly acceptable for the capacitor to have absorbed moisture. If your ppl don't either prevent moisture absorption or remove the moisture prior to soldering, their component could fail
Electronics Forum | Thu Jul 08 16:15:12 EDT 2021 | stephendo
Just to be clear, you mean the card says that the moisture level is good but in reality the part has too much moisture? And you are not one of those people that vacuum seal MBBs with as much vacuum as possible are you? If you do more than lightly ev
Electronics Forum | Tue Jul 02 12:10:06 EDT 2002 | fmonette
Dason, Just a word of caution about your experiment. Evaluating moisture content by weight gain is a very simplistic model, based on the assumption that the moisture content is uniform across the package. In fact, recent technical papers have cl
Electronics Forum | Tue Aug 25 12:54:56 EDT 2009 | pcbrookie
Hello All, I was poking around the internet and stumbled on a website selling reusable zip-top Moisture Barrier Bags. From the page, it's hard to determine if the bag MUST be heat-sealed to keep moisture out (not sure why you would want to heat-sea
