Electronics Forum | Mon Jul 12 20:26:10 EDT 2021 | stephendo
A test that I would like to see is, expose parts for 24 hours 40%-60% RH, 25C for 24 hours. Then seal with a HIC and minimum desiccant that Jstd 33 requires. Five to seven days later open and see if HIC says good but parts have excess moisture. I t
Electronics Forum | Fri Jun 03 05:38:54 EDT 2011 | grahamcooper22
Ideally the MSL should be recorded on the label on the DRY PACK that you receive the devices in....that's the protocol the device manufacturers / distributors should use to help your goods in and shop floor personnel know which are/are not moisture
Electronics Forum | Wed May 16 13:02:12 EDT 2007 | slthomas
Moisture barrier bags are polymer coated foil so are nearly gas impermeable. There's always some coating left at the weld (or it wouldn't stick) so they're not completely sealed but that's as good as it gets. Usually people use the vacuum to remove
Electronics Forum | Tue Aug 25 20:01:26 EDT 2009 | davef
We don't use bags like you describe. All of our bags are ESD shield bags that have dissipative and antistatic attributes. We'd be uneasy about the zip lock closure thing. Use your static field meter to determine the charge generated by opening and
Electronics Forum | Tue Jul 17 00:10:32 EDT 2012 | amitsindwani
Referring to IPC/JEDEC J-STD-033B.1 section 3.3.2.2 'The amount of desiccant used, per moisture barrier bag, shall be based on the bag surface area and WVTR in order to limit the interior relative humidity in the MBB to less than 10% at 25°C.' So wha
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 | Fri Nov 03 15:31:18 EST 2006 | Steve
Mika, It's not my company, I've used them in the past to re-ball some BGA's for me. They always do a moisture removal bake on moisture sensitve devices prior to ball attach, and then pack them in a vacuum sealed moisture barrier bag when they retu
Electronics Forum | Thu May 09 17:28:33 EDT 2002 | davef
There is no IPC specification, nor should there be. * There are just too many peculiarities in the design and fabrication of PWB. * The issue is not defining how to store boards. The issue setting expectation for reliable products and allowing you th
Electronics Forum | Thu Mar 09 22:03:04 EST 2000 | Charles Leech
DaveF: Since these SMT "spounges" get wet in Singapore and they got to get dry in Singapore, the airfreight idea won't work. I don't think the airlines would be too thrilled with a teathered ballon floating 10,000 feet in the air over the city. STAT
Electronics Forum | Thu Mar 09 22:03:04 EST 2000 | Charles Leech
DaveF: Since these SMT "spounges" get wet in Singapore and they got to get dry in Singapore, the airfreight idea won't work. I don't think the airlines would be too thrilled with a teathered ballon floating 10,000 feet in the air over the city. STAT
