Hi Brian,

I was thinking more about double sided reflow boards than the bare fabs, and perhaps the populated boards in the stencilling area. 
The people of DEK that gave me the information about ESD-risks of polyimide stencils are normally very knowledgeable. Don't know the number of Volts that mentioned, but it was quite a lot.
But maybe it's just a part of ESD-sillyness that strikes every now and then.......

Daan
Unclassified mail 


>>> Brian Ellis <[log in to unmask]> 02/28 10:14 am >>>
Daan

ESD? On bare boards? So what?

Brian

"d. terstegge" wrote:

> >From one of my stencil vendors I heard that ESD is a much greater concern when using polyimide stencils. For that reason he doesn't sell them anymore, in spite of the advantages of polyimide.
>
> Bye,
>
> Daan Terstegge
> Unclassified mail
> Personal website: http://surf.to/smtinfo 
>
> >>> Murugan Vasudevan <[log in to unmask]> 02/27 8:29 pm >>>
> Hi technetters..
> here's an early bird question for this week...this one
> is regarding stencil wear. well, i have read in some
> literature that a fully hard laser-etched stainless
> steel stencil can last for more than a 100K cycles
> without ay problem. Now, the problem is, we are
> getting into this business of using a polyimide
> stencil. it is giving great deposits, good release
> characteristics, outperforms the metal stencil for our
> application, etc. etc. BUT...the one thing that
> concerns most of us is .."well, everything is okay
> NOW...but what might happen lets say 50K cycles
> after!?"..and i was wondering if anyone in this group
> has any experience with using such a stencil?" if so,
> i would definitely be interested in knowing how is it
> behaving on a long term basis..
>
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