Yes, styrofoam is considered to be an ESD generator, and shouldn't be
used near any ESD sensitive devices. I would suggest that the boards be
removed from the styrofoam packaging in a different area, and then any
styrofoam bits that remain on the boards might have to be removed with
the help of antistatic equipment, such as an air ionizer.
Blair Hogg
QA Manager
GAI-Tronics Corp.
>>> [log in to unmask] 02/21/03 11:38AM >>>
Hi Howard,
Aren't styrofoam balls a Non ESD material? We don't use it, though
parts may come in baggged with peanuts around that. It seems to me that
styro-balls would be "staticy"--as you describe them sticking to your
assemblies--as well as having out-gassing properties, though I can't say
if a board in an ESD bag would be so affected, and what dependence
exposure time might have, as if that is even relevant. (Sounds like all
kinds of new threads developing here) I know they have plenty of ESD
safe treatmentsfor packaging products, but your problem seems quite
annoying. Another example of Purchasing vs. Engineering or application
requirements?
This isn't helping you. I am cuious about the ESD bit though, and what
else may weigh in.
Steve M.
----- Original Message -----
From: Howard Watson
To: [log in to unmask]
Sent: Friday, February 21, 2003 09:48
Subject: [TN] Styrofoam beads on PCB's
Dear Technetters,
I don't know if this is a problem that only we have, but it involves
Styrofoam packing beads that show up on the PCB's that are delivered to
our lines. The little beads are all over the plastic packaging of the
individual PCB bundles, and these can eventually hitchhike onto a PCB
that goes into the printer. You can guess what happens - a bead ends up
on a pad or in an aperture and the result is insufficient or missing
solder on one or many boards. Our supplier is in China or India, and
they claim that they must use Styrofoam for packaging. In my opinion,
this is the wrong type of packaging to use, but because of the low
"initial" cost, I don't have too much clout on this issue. Is anyone
else familiar with this problem?
Thanks in advance for all of your opinions - they are helpful and
very valuable to my job!
Howard Watson
SMT Manufacturing Engineer
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