Hello Ioan,

Are you getting my email?

Thanks,

Steve Gregory

On Tue, Mar 12, 2024 at 6:59 AM Ioan Tempea <
[log in to unmask]> wrote:

> Thank you gentlemen!
>
> Ioan
>
> -----Message d'origine-----
> De : TechNet <[log in to unmask]> De la part de [log in to unmask]
> Envoyé : March 12, 2024 7:55 AM
> À : [log in to unmask]
> Objet : Re: [TN] Surface energy for conformal coating
>
> Having done this with Dyne pens many times, I can confirm Mark Austin is
> correct. It is nice to know others found the same thing.
> It does not seem to matter whether the boards are completely different
> designs or from different vendors; matte finish solder mask is always in
> the 40-50 dyne range. Buttercoated PWBs with no solder mask seem to be the
> worst with readings less than 30 dyne. Glossy solder mask is usually
> between 30-40 dyne.
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Mark Austin
> Sent: Tuesday, March 12, 2024 4:02 AM
> To: [log in to unmask]
> Subject: Re: [TN] Surface energy for conformal coating
>
> ----
> External E-mail --- CAUTION: This email originated from outside GDMS. Do
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>
> Hello Ioan
>
> I was previously advised by a coating manufacturer that the dyne
> measurement of solder resist should be >40.  I went through an exercise of
> evaluating various coatings to find the ones best suited for conformal
> coating and found that most matt solder resists achieve dyne >40, whereas
> gloss or semi-gloss resists were around 30 - 34 range.
>
> Regards
>
> Mark
>
> Mark Austin
> Lead Engineer
>
> Phoenix Systems UK Ltd
>
> D: +44 1329 242325
> T: +44 845 658 6111
>
>
>
> https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.phoenixsystemsuk.com&c=E,1,qZjDt78Aq1LDnnSQER5Izf5eTm6--Uc6Gg0viplLqjIxYQVfTYTD3gWka34tnpOlM6UjMuTYueATCpGPvSKzKqw_5W2HoJBOtFh69Dv718n8O7c,&typo=1
>
> Please consider the environment before printing this e-mail.
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Ioan Tempea
> Sent: Monday, March 11, 2024 7:42 PM
> To: [log in to unmask]
> Subject: [TN] Surface energy for conformal coating
>
> CAUTION: This email originated from outside your organization. Exercise
> caution when opening attachments or clicking links, especially from unknown
> senders.
>
> Hello Technos,
>
> Some many years ago I have discovered, with help from this illustrious
> panel, the existence of the dyne pens. Have used them for a while and them
> moved to microelectronics, where I have spent 11 years without any contact
> with conformal coating. So I've kinda forgot some details.
> Where I work we have the Surface Analyst device, measuring contact angles
> and this is supposed to obsolete the use of dyne pens.
>
> The trouble is I can't remember what dyne values are related to good
> coating wetting. Or even better, which contact angles are preferred?
>
> Can anyone help?
> I'm interested in both solder masked PCBs and Au plated ceramics and the
> optimal values I believe differ from PCB to ceramics.
>
> Also, do you have any good articles or textbooks to recommend on this
> matter?
>
> Thanks,
>
> Ioan
>


-- 
Steve Gregory
Kimco Design and Manufacturing
Process Engineer
(208) 322-0500 Ext. -3133
Cell Phone: (918) 706-2779

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