But I know Lloyd loves a challenge..... Doug Pauls Principal Materials and Process Engineer Rockwell Collins On Tue, Jun 20, 2017 at 6:31 AM, lduso - Diamond-MT.com < [log in to unmask]> wrote: > We often use the Kapton for masking when we want the tape to cause > de-wetting. Like when using UV40 UV cure, the dewetting makes it easier to > demask. If you cure the UV material over the green tape, it's damn near > impossible to remove. > > Lloyd Duso > Plant Manager > Diamond-MT > (814) 535-3505 > www.Diamond-mt.com > > On Mon, Jun 19, 2017 at 7:08 PM, Yuan-chia Joyce Koo <[log in to unmask]> > wrote: > > > 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 > >> > >> > >> > >> _____ > >> > >> 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. > >> > >> > >> > >> > >> > >> > >> > >> 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. > >> > >> > >> > >> > >> > >> > >> > >> > >> >