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May 2000

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Subject:
From:
Lou Hart <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 15 May 2000 14:39:55 -0400
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TechNetters,

Thanks for the feedback on my earlier ESD lab coat question.  I did a little looking and found my synthetic-carbon nylon coat measured about 1 megohm across 1 sleeve, 100 Meg from sleeve to the back panel, and immesurable high (using a floor resistance checker) from the back to the other sleeve or from sleeve to sleeve.  Between snaps on one sleeve (measured by multimeter), resistance was 15 or so megs.  Looks to me like the snaps don't make such great contact between the carbon-nylon fibers (there are such connectors at the tip of each solder, supposedly making contact between 3 pieces of fabric).  I talked with Static Control Corp's tech director.  He said plain cotton coats were fine, but when the RH dropped below 20% they were hardly any better than synthetics.  

My next question has to do with nonstatic tape.  We could use it for masking gold tabs and otherwise protecting components, or for keeping solder out of connectors during wave solder.  Any opinions as to the value of nonstatic tape?  Our usual Kapton tape generates 1500-2000 volts, and the "masking tape" is in the range of a few hundred, as predicted by 3M.  I found a roll of nonstatic packing tape and tested it at 1-5 volts.  The non static tape is more than twice the cost of the other stuff.

Thanks for any information
Lou Hart

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