Topical antistats can be low charging or dissipative, and ideally is both.
Just spray on and allow to dry. The treated material's surface becomes low
charging, and if dissipative and grounded whatever charges are generated are
removed to ground. For example, when contact is made with a grounded operator.
A typical maintenance schedule would be to apply every 3 months, but if there is
no wear, the topical antistat can be effective for a very long time.
One could measure charge generation using a static field meter, but most
companies find measuring resistance easier.
As the topical antistat wears the RTT resistance point-to-point, measured in
ohms, will increase. Taking this measurement can be a regular part of a
company's ESD control plan compliance verification plan. As the topical
antistat wears, it will come closer to an insulative resistance range. Tracking
this over a period of time will allow the user to define a maintenance schedule
that will optimize performance while minimizing material and labor costs.
Gene Felder
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roach, David
Sent: Wednesday, November 30, 2005 9:08 AM
To: [log in to unmask]
Subject: Re: [TN] Anti static sprays
I hadn't heard of Licron 1755, but it sounds like it would be worth checking
into. I would be most concerned about how effective it is and whether it
would ever chip or wear off. Of course, the best solution is to use
ESD-safe materials where possible (conductive plastics, metals, ESD
laminates for bench tops, etc.), but this isn't always possible or
economically feasible, and there may be existing equipment or new tools
where ESD-safe materials are not available.
Dave Roach
-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: Wednesday, November 30, 2005 10:48 AM
To: TechNet E-Mail Forum; Roach, David
Subject: RE: [TN] Anti static sprays
That was my thought too.
I did a little more web surfing and found a Tech-Spray product called
Licron(r) 1755 listed as a permanent Static Dissipative Coating. Looks
like a cured on coating.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roach, David
Sent: Wednesday, November 30, 2005 11:15 AM
To: [log in to unmask]
Subject: Re: [TN] Anti static sprays
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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