Wee Mei:
The supplier of our packaging material inform me that the pink
material is good as a filler in packaging. It is not conductive but will not
electrically charge up due to chemicals added to inhibit the charging of
electrons or removal of. The material that is used to wrap the boards with
is a semi clear grayish one in a form of bags or a black one in a spongy
mat form. This material contains carbon which is a conductor and will
dissipate any charge due to rubbing motion or air friction. The spongy
material is not recommended to be used as wrapper because any piece that
breaks off and stays on the boards may act as a short if imbedded in the
wrong place. There are bags of any size. You can even buy the material in
rolls and make you own bags.
Regards,
Ramon
> -----Original Message-----
> From: Brian Ellis [SMTP:[log in to unmask]]
> Sent: Wednesday, August 27, 2003 4:36 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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