Hi, Bob
What you may want is an inert hard fill material such as diallyl
phthalate. It can withstand high temperature excursions later. There are
black underfill epoxies that fit this description and cure to a matte
dark gray/black finish. That type of underfill is available as a
snap-cure epoxy.
However, you may need to determine that whatever material you use is
compatible with whatever the material is for a particular component, and
is appropriate for the intended use environment. It may need to be a
low-outgassing filler for space use, as an example.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of bob wettermann
Sent: Monday, December 21, 2009 1:40 PM
To: [log in to unmask]
Subject: [TN] Black Top Vendor Suggestion?


 Dear Technetters:
Does anyone know of a vendor of "black top" to
fill in voids left by laser "X-out" patterns in the top of an epoxy
(plastic) package ?
We are demarking an area of a device and would like to fill it in  with
something other than a colored epoxy (too long to cure, cures with
glossy finish).
Regards

Bob Wettermann
BEST Inc


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