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October 2012

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Subject:
From:
"Gumpert, Ben" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gumpert, Ben
Date:
Thu, 4 Oct 2012 11:46:26 +0000
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text/plain
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text/plain (75 lines)
Lee, Phil,

I typically use urethane coating, so I am used to something that thickens up during application, so this is certainly different than what I am used to.

What I've tried so far is hand application using a brush, and I see the dewetting happening on vertical lead areas, like the legs of gull-wings. And it's happening almost right away, before I go to cure.

I'm using some dummy test boards, but they've been through an in-line cleaner (Kyzen A4625) post soldering, and a hand clean with IPA just prior to coating.

Ben

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Kinner
Sent: Wednesday, October 03, 2012 5:10 PM
To: [log in to unmask]
Subject: EXTERNAL: Re: [TN] UV40 Conformal Coating

Hi Ben,

How are you applying the material and what components are you seeing this on? 

There are some application tricks to the trade to minimize this phenomenon.... You can contact me offline if you'd like to discuss this further.

Otherwise, I'd recommend you speak to  both Matt Eveline at HumiSeal and Jon Urquhart at PVA, both great resources to get you going in the right direction.

Best Regards,

Phil
+44 7703 795422

Sent from my iPhone

On 3 Oct 2012, at 22:47, Lee Hitchens <[log in to unmask]> wrote:

> Hi Ben what are you comparing too? A solvent based coating or something else! Is the coating running during or just after application or during the cure process under the uv lights where it can get hot? 
> 
> Best regards
> 
> Lee hitchens
> 
> Sent from my iPad
> 
> On 3 Oct 2012, at 21:39, "Gumpert, Ben" <[log in to unmask]> wrote:
> 
>> 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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