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March 2010

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Mon, 29 Mar 2010 13:49:29 -0700
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Kevin,

wouldn't make it more complicated than necessary. Why not just use a Dremel 
with a suitable rondell and touch the solder joint for a second. It will be 
matte.
And IF you still want to use a paint, consider  that the light wave at that 
frequency  may not see the paint black as you do,  instead it may be 
transparent.

Inge

--------------------------------------------------
From: "Glidden, Kevin" <[log in to unmask]>
Sent: den 29 March 2010 05:24
To: <[log in to unmask]>
Subject: [TN] Low Outgassing, Black Sealant / Underfill

> Good Morning, and Happy Monday.
>
> A couple of questions for anyone:
>
> We have a lighting application where we are getting light reflection off 
> two specific solder joints (we're so lucky to still use Sn63Pb37 they are 
> just TOO shiny!), so I am looking for a method to cover those joints with 
> a black (or dark gray) sealant.  This would need to be a low out-gassing 
> material.  Does anyone know of any such material?  Is there such a thing 
> as black pigmented conformal coating?
>
> The second question would be for this same product.  I also have a need to 
> seal around the base of some LEDs to prevent moisture ingress to the 
> bottom only terminations.  Would perimeter sealing be sufficient?  How 
> does one determine when they need to underfill vs perimeter seal?
>
> Thanks!
>
> Kevin Glidden
>
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