dupont Kapton is not everybody cup of tea. many "Kapton" equivalent
with silicone or acrylic adhesive leave residue on the gold wire
bonding pad, but not Dupont Kapton... if you can find true Dupont,
stay with them. (from what I heard, they only sell the roll of
kapton tape now, but let 3rd party put on what ever the adhesive....
so your Dupont may have different adhesive... (still have half roll
of Kapton... true one as collection... thick, enough to patch up
stacking issue to prevent short...).
good old days.
jk
On Jun 19, 2017, at 5:42 PM, Wayne Thayer wrote:
> I believe that the right silicone based PSA would work fine. No one
> is more concerned about contamination than plating shops. "Plater's
> tape" is a mylar carrier with silicone adhesive. It's used in PCB
> fabs all of the time. But I guess the silicone is in a highly
> stabilized form that doesn't leach oil like the masking dots Phil
> is mentioning below. I've used DuPont Kapton tape with silicone
> adhesive, and I've never had an oil leaching problem. Not good
> stuff for masking because the polyimide material itself causes the
> paint to bead up.
>
> When I opened an R&D board fab lab, I chased out all silicone based
> compounds. So I learned about how bad the acrylic PSAs are: Those
> tapes drop little globs of acrylic PSA EVERYWHERE. True, they don't
> cause de-wetting like silicone has the potential to do, but they
> block plating where they've decided to stick anyway. If you want a
> real nightmare try plastering those danged "Post-It" notes on
> everything: the weakening done to allow them to be easily re-
> positioned frees up the acrylic globs.
>
> Anyway, this is a divergence because for relatively crude masking
> applications on surfaces that don't have to be perfectly clean,
> standard painter's materials are fine if you can address the static.
>
> Wayne
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Sullivan
> Sent: Monday, June 19, 2017 1:58 PM
> To: [log in to unmask]
> Subject: Re: [TN] Conformal coat tape of acrylic
>
> Phil,
>
> Yes, I agree. I am not even looking at anything with a silicone
> adhesive. I've been extremely cautions not to introduce silicone
> into our process over the years. I've even gone as far as telling
> the tape slitters not to use the silicone solution on their blades
> when slitting our orders.
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Nutting, Phil
> Sent: Monday, June 19, 2017 4:26 PM
> To: [log in to unmask]
> Subject: Re: [TN] Conformal coat tape of acrylic
>
> Craig,
>
> We use Konform AR and at some point our acrylic adhesive masking
> dots were discontinued and replaced with a silicone based
> adhesive. The silicone worked, however I saw an odd fish eye
> pattern and blooming under UV light around the dots. You could
> watch the blooming as it cured.
>
> My 2 cents is to test the new mask materials with your coating and
> watch under UV light.
>
>
> Phil Nutting | HVP Development Engineer | Excelitas
> Technologies Corp
>
> Lab: +1 978.224.4332 | Office: +1 978.224.4152
> 35 Congress St, Salem, MA 01970 USA
> [log in to unmask]
> www.excelitas.com
>
>
>
>
>
> Please consider the environment before printing this e-mail.
>
> This email message and any attachments are confidential and
> proprietary to Excelitas Technologies Corp. If you are not the
> intended recipient of this message, please inform the sender by
> replying to this email or sending a message to the sender and
> destroy the message and any attachments. Thank you.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Sullivan
> Sent: Monday, June 19, 2017 1:31 PM
> To: [log in to unmask]
> Subject: Re: [TN] Conformal coat tape of acrylic
>
> Thank you. I’ve requested samples of those recommended. Much to my
> surprise, I also found some on Humiseal’s website so I asked for
> samples of that as well.
>
>
>
> Steve: Yes, we go through rolls of that as well. But we have a
> couple of new assemblies where it’s giving us issues for some
> reason. I first thought it was cleanliness, then possibly just a
> bad lot of tape, but I’ve exhausted those conditions.
>
>
>
> Craig Sullivan
>
> Manufacturing Engineer
>
> IT Administrator
>
> Phone: (607) 266-0480 x115
>
> Fax: (607) 266-0482
>
> Email: [log in to unmask]
>
> Web: www.mplinc.com <http://www.mplinc.com/>
>
>
>
> MPL, Inc.
>
> 41 Dutch Mill Road | Ithaca | NY | 14850
>
> An ISO 9001:2008 Certified and ITAR Registered Company
>
> IPC member since 2004
>
>
>
> _____
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> Export Control:
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>
> From: lduso - Diamond-MT.com [mailto:[log in to unmask]]
> Sent: Monday, June 19, 2017 12:29 PM
> To: TechNet E-Mail Forum; Craig Sullivan
> Subject: Re: [TN] Conformal coat tape of acrylic
>
>
>
> 3m Green Tape 233+. The most common size we use is the 3/4", p/n
> 26334. Slightly stronger adhesion than the blue. We still stock the
> blue for masking delicate components, like radial resistors,
> specifically because it has low adhesion and there is less chance
> of damaging the components on demask.
>
>
>
>
> Lloyd Duso
>
> Plant Manager
>
> Diamond-MT
> (814) 535-3505
>
> www.Diamond-mt.com
>
>
>
> On Mon, Jun 19, 2017 at 11:59 AM, Craig Sullivan
> <[log in to unmask]> wrote:
>
> What masking tape is everyone using for Type AR coatings?
>
>
>
> Long story short:
>
> We used to use the St. Gobain M797 which was also known as
> Humiseal's HT-500. Due to numerous manufacturer issues, we stopped
> using it.
>
> One of our customers spec'd in the blue 3m painter's tape and we
> have been using it successfully for a while.
>
> We have some new assemblies where the 3m adhesion is terrible and
> am now back onto looking for a new tape, similar to what we all
> went through some 8 years ago.
>
>
>
> Craig Sullivan
>
> Manufacturing Engineer
>
> IT Administrator
>
> Phone: (607) 266-0480 x115
>
> Fax: (607) 266-0482
>
> Email: <mailto:[log in to unmask]> [log in to unmask]
>
> Web: <http://www.mplinc.com/> www.mplinc.com
>
>
>
> MPL, Inc.
>
> 41 Dutch Mill Road | Ithaca | NY | 14850
>
> An ISO 9001:2008 Certified and ITAR Registered Company
>
> IPC member since 2004
>
>
>
> _____
>
> Confidentiality Notice:
> This e-mail contains privileged and confidential information which
> is the property of MPL Incorporated, intended only for the use of
> the intended recipient(s). Unauthorized use or disclosure of this
> information is prohibited. If you are not an intended recipient,
> please immediately notify MPL Incorporated and destroy any copies
> of this email. Receipt of this e-mail shall not be deemed a waiver
> by MPL Incorporated of any privilege or the confidential nature of
> the information.
>
> Export Control:
> This message is intended only for the addressee and may contain
> information that is company confidential or privileged. Any
> technical data in this message may be exported only in accordance
> with the U.S. International Traffic in Arms Regulations (22 CFR
> Parts 120-130) or the Export Administration Regulations (15 CFR
> Parts 730-774). Unauthorized use is strictly prohibited and may be
> unlawful. If you are not the intended recipient, or the person
> responsible for delivering to the intended recipient, you should
> not read, copy, disclose or otherwise use this message. If you have
> received this email in error, please delete it, and advise the
> sender immediately.
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