Leo,
It is not my intention to create something else from my clarification of
this issue of the pink bubble wrap/bags.
I am a novice in ESD and it is not possible for me to read up all books
on ESD. As such, I welcome readily available information or discussion.
We did not discuss any issues of ESD in the course. I brought up this
subject to satisfy my curiousity and thirst for extra inforamtion. I
just want to ensure that the ESD control implementation in my dept that
we recently setup is correct. If not, how I can help to improve.
I want to stress that my instructor did not promote an agenda beyond
what is required in the course.
Regards,
Wee Mei
Leo Lambert wrote:
>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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