Re: [SI-LIST] : ESD Smocks

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From: Doug McKean ([email protected])
Date: Wed Dec 20 2000 - 11:06:57 PST

Doesn't have anything to do with a faraday effect. The smock is
providing a conductive surface to dissipate whatever charge is
developed by the clothing underneath. Synthetic materials do not
drain charges well and putting a dissipative material over the
helps the dissipation of charge when the person is properly grounded.
The smock should have a minimum of at least 10 per cent carbon
fibers, IIRC.

You won't measure how conductive the smock is with an ohmmeter.
It's still pretty high. There's three grades of conductivity for ESD:

conductive = less than 1x10^5 ohms/square
dissipative = 1x10^5 ohms/square > dissipative material > 1x10^12
insulative = greater than 1x10^12 ohms/square

The smock is in the dissipative range. Or supposed to be.

When you're considering "conductive" or "dissipative"
flooring for work areas, these values are what it all means.

- Doug

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