Kevin: Consider the possibility of inspecting the "impregnated" bags, with a microscope to assure that they are truly "impregnated", thus insuring you got no coated bags. If the impregnation material is a carbon or metallic dust, it should be visible with enough magnification.
Further, most coatings which render anti-stat properties are first cousin to laundry fabric softeners, and I would not want my electronics touching such stuff.
Rudy Sedlak
Kevin Glidden <[log in to unmask]> wrote: Hello 'Netters...
Question: Does anyone have experience or recomendations in controlling the
supply chain of the pink poly anti-static bags? We currently purchase them
per MIL-PRF-81705 Ty II. But, it has come to our attention (via Customer
Returns and Corrective Action) that some of the bags we were getting were
leaving a sticky residue on the parts. Investigation has led to the
discovery that the anti-static properties of the bags can be attained via
one of two major ways: 1) an anti-static topical coating or 2) anti-static
"materials" (carbon?) impregnated into the bag itself. Apparently the
MIL-spec only specifies the finished properties, not the process. I have
been told the coating is a cheaper method than the impregnated. I would
like to prevent purchase of the topically coated bags, and only purchase the
impregnated versions, but how to specify it? I have found several vendors
and / or manufacturers who claim their bags are impregnated. But I am
reluctant to to tie my Purchasing groups hand by limiting such a commodity
item (there are apparently a thousand manufacturers and a million more
distributors) to a few vendors. I am also uncertain that most (if any)
distributors would a) see my requirement for the impregnated version, and if
they did b) even know what type they sell. In lieu of the above issues, it
has been proposed we implement more stringent incoming inspection to
visually inspect for oily residues. While this works, it would also let the
supplier off the hook, so to speak, if we found bad bags that were still
compliant to the purchase spec (MIL).
Has anyone faced this same problem? Any recommended vendors? Control
Plans?
Thanks!
Kevin Glidden
Manufacturing Engineer
Luminescent Systems Inc.
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