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Date: | Mon, 3 Feb 2014 11:00:37 -0600 |
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Arnaud,
I think you are asking about surface energy rather than surface tension.
We use the readily available Dyne Pens which have solutions calibrated
back to an ASTM standard.
I generally use this rule of thumb regardless of the coating used.
Under 30 dynes/cm: Coating adhesion will be poor
30-35 dynes/cm: Coating adhesion will be slightly better, but you can
expect more frequent cases of delamination.
35-40 dynes/cm: Coating adhesion generally good, but can have some
periodic delamination or adhesion issues.
40-45 dynes/cm: Coating adhesion is good and only rarely will you see
delamination problems
45+ dynes.cm: Good adhesion.
Of course, there will always be special cases but this is a good starting
point.
Doug Pauls
From: GRIVON Arnaud <[log in to unmask]>
To: <[log in to unmask]>
Date: 02/03/2014 10:48 AM
Subject: [TN] [COM] Solder Mask Surface Tension for Conformal
Coating Adhesion
Sent by: TechNet <[log in to unmask]>
Hello TechNet,
I would like to sense the best practices in terms of solder mask surface
tension with respect to conformal coating adhesion :
- Which standard/test method are you using?
- Which requirement (e.g. minimum value in dyn/cm²) would you
accept for the various CC types (acrylics, urethanes, silicone, parylene)?
Thanks in advance for the insights.
Best regards,
Arnaud Grivon
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