Please read MIL-STD-1686C also.
-----Original Message-----
From: Neda Thrash [mailto:[log in to unmask]]
Sent: Monday, May 21, 2001 2:05 PM
To: [log in to unmask]
Subject: Re: [TN] ESD Approved Packing Foam vs. Static Shielding Bags
No, I didn't bet a lunch but I'm afraid I am going to have to go back out
there (to the shop floor) and eat his. I don't mean to sound arrogant but I
get so frustrated! I think he knew as much as I did that he was totally
wrong and had nothing to support his theory but just wouldn't back down when
he was backed into a corner, being confronted with the fact he was
carelessly contributing to poor quality.
Thank you very much for the info!
Neda
>>> [log in to unmask] 05/21/01 12:57PM >>>
Hi Neda!
Are you betting a lunch? I found this link, it's from a FAQ on ESD Systems
web page:
http://www.esdsystems.com/qanda/question.asp?action=question&id=394
Question: If parts (resistors,pwb,) are placed inside a Pink Poly Bag at a
grounded work station by a grounded worker then will the bag still provide
protection to the item, once the person is ungrounded and the product is
moved to other areas of the factory? If not. what type of bag should be
used?
Answer:
Pink poly bags only help protect the devices from tribocharging and will not
necessarily protect the contents from electric fields, external charging or
ESD events to the package. In some cases, the protective properties of the
pink poly bags are temporary and may bleed out over time, rendering the bag
non-ESD safe as well as contaminating the contents. The best protection from
an ESD bag is from a high-quality film, such as an MVB/EMI film or MI/MO
films. The high-quality films used in our shielding bags are also
manufactured with a soft fold, maintaining the integrity of the Faraday Cage
structure of the bag. This type of structure gives the best protection to
the
contents from tribocharging inside and out, moisture, EMI, static electric
fields and ESD events to the bag.
Hope this helps!
-Steve Gregory-
> ** High Priority **
>
> Hello everyone! I need help settling a dispute. I am aware of the fact
that
> the pink foam designed for packing esd sensitive assemblies helps
eliminate
> the possibility of a charge being generated during a transport while
> cushioning the product but I have an engineer telling me that the
> assemblies are safe if holding the assembly in hand while ungrounded as
> long as the foam separates the hand at the point the pcb is held. If
> someone knows this to be true please send me more information on this
> because this contradicts what I have always been taught and what I am
> teaching. I need your help ASAP!
>
> TIA, Neda
>
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