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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