The anti-static sprays are temporary, so they have to be re-applied
regularly.  I am not sure how long they last, as I have limited experience
with them.  It would be best to check their effectiveness regularly with an
electrostatic field strength meter.

On a related note, in a former life, we purchased some new
static-dissipative (blue) plastic totes.  We sent them through an aqueous
cleaner before sending them into a clean room.  When we tested them, they
had no static dissipative properties.  The manufacturer said that the
anti-static properties are removed by washing, but that the plastic would
"bloom" and eventually become dissipative again.  Our tests showed that this
never happened.  I believe they may have treated the molded plastic parts
with an anti-static spray to call them dissipative, though I have no way to
prove this.  (This was about 8 years ago, so the properties of new products
may be different.)  On the other hand, conductive totes are molded with
carbon in the plastic resin, so they should remain conductive over their
life.  The conductive totes have higher conductivity than static dissipative
totes (especially after being washed :-) ).

Dave Roach

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Wednesday, November 30, 2005 10:04 AM
To: [log in to unmask]
Subject: [TN] Anti static sprays

Has anybody used any of the available anti static sprays to reduce
"static ticking" in a high voltage environment?

On doing a web search I see there are many products on the market, but
are these really for ESD control?.  The question is, do I have to keep
re-spraying the item to keep it functioning or is it a one time
application?

Thanks in advance.

Phil Nutting
Design for Manufacturing Engineer
Kaiser Systems, Inc.
126 Sohier Road
Beverly, MA 01915
voice: 978-922-9300 x1310
fax: 978-922-8374
e-mail: [log in to unmask] <mailto:[log in to unmask]>
www.kaisersystems.com <http://www.kaisersystems.com/>

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