As the author of the IPC-a-600 training program, I'm disturbed that this
kind of information is being delivered throughout the program. There is no
mention of any pink poly material in the instructors guide or in the text
itself. Additional information provided by instructors are what makes the
courses vary from location to location and this can be good and can also be
bad. From my viewpoint this instructor has no idea and it promoting an
agenda which should not be allowed while teaching the course.
I would take this to the IPC training director and have them get back to the
instructors relative to the additional material they are providing. When the
instructors guide was developed all the analogies were realistic to the
board fabrication process and ESD packaging was never introduced.
Perhaps a mention on sulfur free paper between the boards as they are being
packaged would be mentioned as to highlight the potential problem of sulfur
contamination on the solderable surface of the board, but non of the ESD
material.
Bring this up to Jack or John Perry, although they are up to their armpits
in fighting fires, they may be able to shed more light on this matter.
Leo Lambert
Tech Dir.
EPTAC Corp
71 Route 101 A
Amherst NH 03031
www.eptac.com
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Wednesday, August 27, 2003 7:36 AM
To: [log in to unmask]
Subject: Re: [TN] ESD Pink Bubble Wrap/Bags
I'm unable to give you exact up-to-date information but pink ESD
wrapping materials used to contain substances like adsorbed polyglycols,
with free hydrophilic molecular ends. These would absorb atmospheric
humidity and thus be slightly conductive. The downside is that the
adsorbed substances would desorb and transfer themselves to the
assembly, potentially causing electrical leakage problems. As such, they
were not recommendable. It is even possible, but unlikely to a
significant extent, that they could reduce solderability.
Having said that, it is probable that improvements have been made to the
materials in the meanwhile and today's are OK, but I cannot be categorical.
However, what you say about dioxin is not credible: there is no way that
this could happen.
Brian
Lum Wee Mei wrote:
> Hello,
>
> We recently ordered cushioned ESD bags and a big roll of the pink bubble
> wrap. The pink bubble wrap is used to wrap PWBA that are bigger than
> those ESD bags that we ordered. I have heard that pink bubble bags have
> impact on PWBA even though they are ESD. However, my supplier ensure
> that there is no problem or impacts at all as long as they are ESD coated.
>
> I just came back from the IPC-A-600 Inspector course and was told by my
> instructor that pink bubble bags absorb moisture readily and will age
> the PWBA ESD coated or not as it produce dioxin. This will cause the
> PWBs difficulty in wetting.
>
> I just searched the TechnNet archieves but I am lost in those messages.
> Can someone be kind enough to give me some good reference or advice what
> am I going to do with that big roll of pink bubble wrap?
>
> Thanks and regards,
> Wee Mei
>
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