Technet,
We use ESD masking tape and Kapton tape. There are many suppliers of
these tapes (3M 800-828-9329, Marshall 800-432-2223,Techni-Tool
800-505-8665,Static Technologies 617-357-6444,Wescorp
800-537-7828,...) . For selection of tapes used a charge analyzer with
voltmeter,field meter, and decay meter (traceable to NIST) meets
EOS/ESD Std No.3, Mil-Std-45662A. You will need this analyzer to chose
the "best fit" tape for your specific materials, processes and
environment.
The environment is very important you can provide an environment to
inhibit or prevent static (temperature/humidity, presence of static
generators, ESD workstation, insulators (material with ability to
retain a charge). For detailed information ask for ESD Associations'
new catalog which describes 11 stds,4 drafts,& 5 advisory
docs.....315-339-6937.
Brian
Bill,
Someone has already suggested ionizing air streams for reducing
electrostatic charges during mask and demask.
I assume that the operator, spray booth, workpiece support and spray
gun nozzle are all at ground potential. Of course, the circuit itself
must also be at this potential.
For ultimate protection, I'd also attach a shorting bar across all
connector fingers and tie that to your ground buss. Remember, all
those tiny blobs of conformal coating are non conductive.
I also assume that your earth ground is totally isolated from
all electrical feeds and prepared in such a way as to be effective
in all climatic conditions.(such as very dry) There is a Mil Spec on
earth grounding stations. This information was all gathered in another
life, so I don't remember the specific specification.
The opinions stated herein are not those of my employer.
Lyn R. Lynch
602.276.7361
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