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October 2012

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Subject:
From:
Tan Geok Ang <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Tan Geok Ang <[log in to unmask]>
Date:
Thu, 4 Oct 2012 23:06:01 +0000
Content-Type:
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We use non-UV cure coating (Acrylic, Solithane, Arathane) and do encountered quite some wetting issue (but Acrylic is able to easily overcome this issue). Thus, will have perform extra process to remove, especially the release agent from components. We go for horse/animal hair bursh.

Hi Richard, able to share what solvents or materials you used to remove the release agent of componnets?

________________________________________
From: TechNet [[log in to unmask]] on behalf of Richard Kraszewski [[log in to unmask]]
Sent: Friday, 5 October, 2012 3:46:55 AM
To: [log in to unmask]
Subject: Re: [TN] UV40 Conformal Coating

I have seen this same issue with a competitive UV coating to the UV40.

It's partially an issue of surface energy and liquid surface tension.
For proper coating wet-out the coating must have a lower surface tension
than the substrate surface. These UV coatings (typical solventless and
100% solids) seem to have higher surface tension than typical solvent
based coatings. Normally around 40 dyne cm. This limits their ability
wet out properly as this is rather close many PCA surface energies.
Release agents on some components compounds this issue also, as do
vertical surfaces.

Look on the bright side...

If you are doing selective coating with a robot, it is much easier to
maintain keep out zones with these UV coating.

;>)

Rich Kraszewski


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Wednesday, October 03, 2012 3:39 PM
To: [log in to unmask]
Subject: [TN] UV40 Conformal Coating

Technetters,

I'm evaluating Humiseal's UV40 conformal coating, but I'm seeing wetting
issues - where the coating completely runs off of vertical lead
surfaces.

I see from some e-mails a couple of years ago that some of you are using
this coating material, or were looking into it. Is anyone else seeing
this problem, or have some suggestions to fix?

Ben


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