There are special ESD-safe brushes listed in most electronic supply
catalogs that are mechanically bound to prevent this, and also to ground
the bristle. The bristle is usually either horsehair or hog bristle,
both of which generate less of a charge than nylon. As examples of these
brushes, look in ContactEast catalog pn 127-351 through 127-353, 403-239
and 240, 127-277. Applicator-style brush 403-240 can be trimmed down to
get a fine-application brush. I have also qualified non-ESD brushes
417-592 through size 417-595 as they are red sable brushes and have less
ESD charge than the others, even though they were not designed as
ESD-safe brushes. I measured the maximum charge using a field meter,
could not generate more than 4 volts. These particular red sable brushes
do need to be crimped with a pliers to prevent the shedding, but once
crimped they do not pull out.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Amol (349)
Sent: Wednesday, March 15, 2006 8:09 AM
To: [log in to unmask]
Subject: Re: [TN] ESD and paintbrushes
One issue I keep dealing with on an ongoing basis is brush hair in the
conformal coating. We use brushing for touch up operations. once in a
while, the coating material acts on the binding agent in the brush and
makes the brush shed hairs....anyone else encountered this issue?? We
use regular artist brushes....some other material we should be looking
at?
Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing
941 Route 38 Owego, NY 13827
Phone: (607) 687-7669 x349
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joseph H. Smith
Sent: Tuesday, March 14, 2006 3:40 PM
To: [log in to unmask]
Subject: Re: [TN] ESD and paintbrushes
We use natural brushes also in our conformal coating operation. We have
never had any ESD issues caused by the bristles. Another important tool
we have in place is the de-ionizing fan.
Andrew Kettlewell
Sr Process Engineer
Sypris Electronics
Tampa, Fl
-----Original Message-----
From: Stadem, Richard D. <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, 7 Mar 2006 15:26:31 -0600
Subject: Re: [TN] ESD and paintbrushes
There are ESD-safe brushes, including paintbrushes. I believe they are
made of horsehair. Look in the Techni-tool catalog, or similar tool
catalogs. We use some that have blue metal handles, and the bristles are
wired together and connected to the metal handle. If the operator is
grounded, any charge built up on the brush will be drained to ground.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory
Sent: Tuesday, March 07, 2006 3:18 PM
To: [log in to unmask]
Subject: Re: [TN] ESD and paintbrushes
I read somewhere that only Llamas and Nutria (the rodents that live all
over
Louisiana) have ESD safe hair.
Jason Gregory
Manufacturing Engineer
Innova Electronics
(281)653-5593
(281)653-5594 fax
(281)594-0602 cell
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Tuesday, March 07, 2006 2:59 PM
To: [log in to unmask]
Subject: [TN] ESD and paintbrushes
OK, I have not asked a stupid question all day, so I am due.
We do a fair amount of conformal coating by hand, using artist brushes.
Would you consider paintbrushes with soft nylon bristles to be ESD
hazards and if so, why?
Doug Pauls
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