Brian,
That was our thought as well. However, our customer did an ESD survey and was able to detect fairly large charge build-up on the mesh that was coming out of the cleaner (after drying). They've demanded we stop using it because of this, even though we've used it for years.
Rick Thompson
-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Tuesday, February 10, 2004 12:17 AM
To: TechNet E-Mail Forum.; Rick Thompson
Subject: Re: [TN] ESD Mesh
Please explain to me how a wet plastic mesh of any colour can develop an
electric charge. In the aqueous machines we developed and marketed for
many years, we used polypropylene baskets, some with stainless steel
inserts, some with polypropylene ones. Many customers were worried about
this and tried to measure charges on the baskets and inserts and never
found anything significant. The reason: the polypropylene was
sponge-like and held sufficient water, after their first use, to allow
the charges to be dissipated to all the earthed stainless steel they
were in contact with. I have never heard of a case, in the 25 years that
these were marketed, of a component damaged in a way imputable to these
machines.
Brian
Rick Thompson wrote:
> We've been using a black plastic mesh material to provide cushioning and protection in our stainless steel wash baskets for small boards that tend to get moved around and damaged during aqueous washing. As this material was bought before my time I thought I'd check it's ESD properties since I'd been told it was conductive (it's black, it must be ESD material ). Long story short, the material appears not to be conductive and builds up quite a charge from the cleaner.
>
> Question: Does anyone know of sources for a conductive mesh type material that could be used for this application? We've checked a couple of ESD materials providers so far without coming up with anything.
>
> Thanks,
>
>
> Rick Thompson
>
> Sr. SMT Process Engineer
> SMTEK International, Inc.
> +1 (805) 532-2800
> [log in to unmask]
>
>
>
>
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