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
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.
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