Doug,
Any chance the application of the coating could be done in an enclosure with
a very high humidity to alleviate the problem of having to worry about ESD?
Bev
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Wednesday, October 17, 2012 3:22 PM
To: [log in to unmask]
Subject: Re: [TN] ESD Heat Shrink Sleeving
You are all determined to pull info out of me. To go a little further:
Like many places, our ESD practices, rooted firmly in the past, has
specified natural bristled brushes to be used in conformal coating
practices. Because "natural fibers" are "safe". Consequently, we use a
lot of camel hair, sable, ox hair, etc.
A few years ago, I began working with a synthetic bristled brush, where
the bristles were made of Taklon. Since I was using them with a water
based coating, and because the fibers were always surrounded by a
conductive media, there were not ESD issues.
Anyone who has used natural fiber brushes with a harsh solvent like
toluene knows that they degrade pretty fast. Taklon is very chemically
resistant. Many issues would "go away" if I could use the more chemically
resistant Taklon fibers to apply 1B31.
But, that means I now have a synthetic/insulative bristle with an
insulative coating. ESD concern rears its ugly head. We did ESD testing
and found that the static threat comes NOT from the bristles, but from the
wooden painted handles.
I could use metal handles to solve my ESD problem, but they don't come in
Taklon.
So, I look for a way to eliminate the ESD generation potential on the
painted handles, without resorting to any of the liquid coatings that are
attacked by the toluene solvent.
Doug Pauls
From: "Glidden, Kevin" <[log in to unmask]>
To: "[log in to unmask]" <[log in to unmask]>
Cc: TechNet E-Mail Forum <[log in to unmask]>
Date: 10/17/2012 02:07 PM
Subject: RE: [TN] ESD Heat Shrink Sleeving
Oh!
How about:
http://www.gordonbrush.com/anti-static-brushes.html
(not an endorsement, no experience, no vested interest ? just a quick
Google search)
Kevin Glidden
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, October 17, 2012 3:00 PM
To: Glidden, Kevin
Cc: TechNet E-Mail Forum
Subject: RE: [TN] ESD Heat Shrink Sleeving
Kevin and others,
I should have been a little more specific in my request. In addition to
the liquid coatings people have suggested, there is an ESD version of
Plastisol that works as well. Here is the problem:
Almost all of these liquid materials come in a toluene/xylene (or similar)
carrier, or toluene/xylene is specified as the clean up agent if you
spill. The material I would be painting on is Humiseal 1B31, which is in
a toluene carrier. I would be afraid that the ESD coating would dissolve
in the solvent and contaminate my 1B31 coating. That is why I wanted to
go heat shrink, rather than some form of liquid material that could be
dissolved.
Doug Pauls
From: "Glidden, Kevin" <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>, "
[log in to unmask]" <[log in to unmask]>
Date: 10/17/2012 01:19 PM
Subject: RE: [TN] ESD Heat Shrink Sleeving
Never heard of such a thing....but what about a dip in ESD floor paint?
-----Original Message-----
From: Douglas Pauls [mailto:[log in to unmask]]
Sent: Wednesday, October 17, 2012 2:09 PM
To: [log in to unmask]
Subject: [TN] ESD Heat Shrink Sleeving
Good afternoon all,
I wonder if any of you know of a heat shrinkable sleeving that would be
in the static dissipative range for volume resistivity? This would be
between 1E6 and 1E9 ohm-cm. Most of the ones that I am aware of are 1E11
ohm-cm or higher.
I don't know of any, so I thought I would turn to my favorite forum.
The application is paint brush handles. Since most brushes are painted
wood, they can generate static. We thought having a shrinkable ESD cover,
vs. some of the liquid coatings, would be a possible solution.
Doug Pauls
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