We specify that all masking and demasking must be done under an ionized
air blower. Our studies have shown this to be effective. Good point
though.
Doug Pauls
"Stadem, Richard D." <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
05/16/2011 10:04 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
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Subject
Re: [TN] Conformal Coat tape
I hate to throw another monkeywrench into all of this, but please keep in
mind that the polyester tapes can generate one very large ESD jolt when
being stripped off, either off the roll, or off the product.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Monday, May 16, 2011 9:20 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coat tape
Craig,
We ran into a similar problem. Below is an excerpt from my ECO to
change/correct masking issues.
The Shercon tape has a silicone adhesive that reacts with the conformal
coating causing a blooming appearance when inspected under black light. It
is also visible under normal lighting.
Mark existing material "SHERCO*CC00250" as OBS.
Scrap the Shercon product. Dots are green in color. No Shercon purchases
shown for this part.
Add "ATS*04668DOT02513100" to AML.
Manufacturers description "ATS668 Dots 1/4" Diam 13,100/ roll".
Available from Ellsworth Adhesives.
I hope this helps.
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]
www.kaisersystems.com
http://www.linkedin.com/in/philnutting
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Sullivan
Sent: Monday, May 16, 2011 9:34 AM
To: [log in to unmask]
Subject: [TN] Conformal Coat tape
Well, I suppose this is a repeat from a few years ago when Humiseal
stopped selling their conformal coat tape and left everyone searching for
alternatives.
Recap: Humiseal HT-500 tape was manufactured exclusively for Humiseal by
St. Gobain. The St. Gobain part number is M797. St. Gobain had numerous
quality issues and as such Humiseal ceased the line. St. Gobain continues
to manufacture the tape. We had continued to use the St. Gobain part with
minor quality problems here and there. We decided to live with the issues
because the tape works so well with our Acrylic coating.
Fast forward to today: St. Gobain decided to put the tape on a liner to
correct various issues they and other customers had. Problem is we now see
excessive residue left on the boards as well as the rolls falling apart if
we're not careful with handling. They've also scaled back production and
as such the lead times have quadrupled.
So, my question is can anyone share what they use with their acrylic
coatings? We use a boat load of this stuff so I need to find a seamless
replacement.
Thank you,
Craig Sullivan
Manufacturing Engineer
MPL Incorporated
P: 607.266.0480
F: 607.266.0482
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