Kevin,

Did some Googling as I was curious as to what now exists.  ALEXIT Velvet coating 811-21 (was 3M Nextel) emissivity of .97, thermal conductive 30 deg.C to 150 deg. C, total emissivity -60 deg. C to 150 deg. C.  Can't seem to find a distributor

This seems to be what NASA favors

Aeroglaze Z307 http://www.lordfulfillment.com/upload/DS3018.pdf

Aeroglaze® Z307 black absorptive conductive
polyurethane coating is primarily for application to
substrates used on spacecraft. These applications
include those where coatings must exhibit low
outgassing characteristics while providing static
dissipating and high thermal absorptivity properties.

also

Aeroglaze Z306 http://www.lordfulfillment.com/upload/DS3017.pdf

Aeroglaze Z302 http://www.lordfulfillment.com/upload/DS3016.pdf

Aeroglaze distributor http://www.pexa.co.uk/lord_aeroglaze_chemglaze.htm

Emissivity of various coatings http://snap.fnal.gov/crshield/crs-mech/emissivity-eoi.html

"GFSC" in the chart is Godddard Space Flight Center

Absorbtivity and Emissivity http://www.solarmirror.com/fom/fom-serve/cache/43.html 

Bob Landman
H&L Instruments, LLC

-----Original Message-----
From: Bob Landman [mailto:[log in to unmask]] 
Sent: Monday, March 29, 2010 3:27 PM
To: TechNet E-Mail Forum; Glidden, Kevin
Subject: Re: [TN] Low Outgassing, Black Sealant / Underfill

3M used to make a paint for optics which has a reflectivity near 0%.

It has a very volatile solvent that flashes off when baked.  We used it in spectrofluorometers we used to make.  Never contaminated mirrors or the grating.  I wouid be interested to hear if they still make it.

Bob Landman
H&L Instruments, LLC

Sent from my iPhone

On Mar 29, 2010, at 8:24 AM, "Glidden, Kevin" <[log in to unmask]  > wrote:

> 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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