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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