Hi Steve,
I am getting your email, although I must confess it seems I don't get 100% of the Technet traffic.
Cheers,
Ioan
De : Steve Gregory <[log in to unmask]>
Envoyé : March 12, 2024 9:45 AM
À : TechNet E-Mail Forum <[log in to unmask]>; Ioan Tempea <[log in to unmask]>
Objet : Re: [TN] Surface energy for conformal coating
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]<mailto:[log in to unmask]>> wrote:
Thank you gentlemen!
Ioan
-----Message d'origine-----
De : TechNet <[log in to unmask]<mailto:[log in to unmask]>> De la part de [log in to unmask]<mailto:[log in to unmask]>
Envoyé : March 12, 2024 7:55 AM
À : [log in to unmask]<mailto:[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]<mailto:[log in to unmask]>> On Behalf Of Mark Austin
Sent: Tuesday, March 12, 2024 4:02 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [TN] Surface energy for conformal coating
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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
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-----Original Message-----
From: TechNet <[log in to unmask]<mailto:[log in to unmask]>> On Behalf Of Ioan Tempea
Sent: Monday, March 11, 2024 7:42 PM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: [TN] Surface energy for conformal coating
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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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