'Pink Poly' bags at one time got their anti-static 
properties from an application of a material that is 
hygroscopic - it attracts moisture to help increase 
conductivity.  The problem with this was that the material 
applied was derived from an animal fat if my memory serves 
me correctly.  This material could contaminate solderable 
surfaces and can also promote corrosion due to it's tendency 
to attract moisture.

We haven't used these bags for a number of years.  If we get 
a component in that type of bag, we transfer it to one of 
those silver ESD bags.  The funny thing about all of that 
though is the inner surfaces of those silver bags are made 
of 'Pink Poly'.

I am not sure if the bags are still made with that material, 
but it's one place to look.

Hope it this helps!

Steve McBride
Frontier Electronic Systems Corp
[log in to unmask]
(405) 624-5281


______________________________ Reply Separator _________________________________
Subject:      [TN] Anti-Static Bags
Author:  MIME7:[log in to unmask] at INTERNET
Date:    6/4/98 12:39 PM


We are seeing a "waxy"image transfer from the bag to the panel after 
what appears to be several months of storage in a controlled atmosphere. 
 It is aggravated by stacking individually packaged boards on top of 
each other and has occurred on several different surface finishes. 

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