Simple Accu dyne marking pens can be used to characterize the surface energy. Below 35 dyne/cm, adhesion is marginal to poor. Search the Technetium archives for “solder mask surface tension for conformal coating adhesion” 2014 Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: TechNet <[log in to unmask]> on behalf of Douglas Pauls <[log in to unmask]> Sent: Tuesday, March 26, 2019 7:32:23 AM To: [log in to unmask] Subject: Re: [TN] [External] [TN] Conformal Coating & PCB Solder Resist Finish Mark, I would tend to agree that matte is better for that reason, but it can also be related to the surface energy of the mask. *Douglas Pauls *| Principal Materials and Process Engr | Advanced Operations Engineering *COLLINS AEROSPACE* 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA *Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773 [log in to unmask] On Tue, Mar 26, 2019 at 8:55 AM Mark Austin <[log in to unmask]> wrote: > Hello > > > > Does anyone have any experience of applying conformal coatings to different > PCB Solder Resist finishes? I am thinking that matt finish solder resist > would promote better wetting of the conformal coating, and possibly better > long-term adhesion. > > > > Best Regards > > > > Mark Austin > > Lead Engineer > > > > D +44 (0) 1329 242325 > > T +44 (0) 845 658 6111 > > F +44 (0) 845 658 6222 > > < > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.phoenixsystemsuk.com_&d=DwICAg&c=ilBQI1lupc9Y65XwNblLtw&r=lTRDjB8ojaf7ZaJ9DHeDAm7e-HFP9fxIkv6fRnV49HE&m=90GOMT2e_v8DvYt3WEn4TR-utfEvMCSsYLqIySgvlxA&s=oHuQ1tVdijPszpFiDTWeDFyR9tK7OQOE2ZBCyWb05NU&e=> > > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.phoenixsystemsuk.com&d=DwICAg&c=ilBQI1lupc9Y65XwNblLtw&r=lTRDjB8ojaf7ZaJ9DHeDAm7e-HFP9fxIkv6fRnV49HE&m=90GOMT2e_v8DvYt3WEn4TR-utfEvMCSsYLqIySgvlxA&s=8pJ1yNm98ZSBPV-2CQux4EjOG4GaoMOl8E9DRUZ2W3w&e= > > > > P Please consider your environmental responsibility, do you really > need to print this e-mail? > > Registered Office: Unit 48, Standard Way, Fareham > Industrial > Park, Fareham, Hants. PO16 8XQ. > > Registered in England & Wales, Number 4356233 > > >
