Doug, Ingemar (and all) - I would add, that from functional, practical and
customer relations perspectives, I claim that dissipative tile is the way to
go. Ever watch a prospective client inspection team, or periodic audit
team, as they first set foot inside your shop (a rhetorical 'yes' I'm
guessing)? When you can show them your clean, shiny floor with no debris,
no cardboard or conductive junk laying around, Humidity and temperature
controls, ionizers, ESD symbols posted everywhere, EVERYONE wearing
conductive footwear and simply make the statement - "we're doing everything
we can to help eliminate ELF" - generally, they've seen enough of your ESD
control plan and commitment to just move on to other subjects in their
audit. This saves time in itself, truly is the best system to combat ESD
and really is a bona-fide commitment to do your best to protect your clients
from ESD headaches. At controls', we've eliminated 'worry' and instilled
confidence in ourselves and to our customers. With bare concrete, wax,
paint or whatever - we used to get that 'dog-eyed, cocked head look' when we
showed our nice, waxed cement floor - regardless if the ESD conditions were
acceptable, or not. That was generally followed by 'prove it'. We have
even gone to the extend of removing all mats and went wall-to-wall with
tile. We also require conductive shoes that stay in the employees lockers
(and stay dirt free). That safeguards against the grounded heel strap foot
being lifted for comfort and not in contact with the floor. As Ingemar
said, meters that are go / nogo assure continued compliance even in an ESD
secure environment, like ours. Tiling before moving in can save alot on
asprin, too. Trust me, we've been there after the fact - and moving 70k sq
ft of equipment so you can tile doesen't come with a lot of pleasantries,
until you're all done.
Regards, Russ Steiner
controls/inc.
----- Original Message -----
From: Ingemar Hernefjord (EMW) <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, October 08, 1999 4:13 AM
Subject: Re: [TN] Conductive Floors ...
> Doug,
> one way to assure yourself and the customer is to buy a number of ESD
indicators. Put them on the wall, one wire to the floor, let people walk
some steps, go to the indicator, one foot on the metal plate one hand on the
upper plate and you get a GO or NOGO. The indicators cost little and are
extremly easy to handle. That's one way to look upon your question. And and
accepted way!
> Ingemar Hernefjord
> Ericsson Microwave Systems
>
> What's the actual resistance of a floor that's
> considered acceptably "conductive" for an area
> that will be handling telecommunication boards?
> I mean, if a customer came into your facility
> and wanted to measure your floor to have it pass
> or fail being a suitably "conductive", what
> resistance would they use for that criteria?
>
> A former coworker informed me that my old company
> is moving to their new building. With the move
> is the discussion about whether to leave the new
> area as bare concrete, tile it, or paint it.
> I'm of the opinion that they can leave it as bare
> concrete, but that's only my opinion.
>
> The old building had conductive tile with copper
> strips and was extremely expensive but reliable.
> It also seemed to make the customers feel at ease
> with something they could see as opposed to bare
> concrete. I can remember making periodic checks
> with a surface resistance tester, but for the life
> of me, I can't remember the limits.
>
> Any additional comments or opinions appreciated,
> since this topic seems to come up here every now
> and then.
>
> Regards, Doug
>
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