Mark,

We did some measurements a few years ago on boards coated with four
different solder mask materials, for a project where we were modelling
the reflow soldering process. All came out pretty close to an emmissivity
of 1 for the FR4 laminate, but where there were tracks beneath the solder
mask the emmissivity was around 0.6

David Whalley

At 05:33 PM 7/6/98 -0600, Mark Harrand wrote:
>Technetters,
>
>I'm working on a project that involves radiant heating of a circuit board.
>I need to know the emmitance value for a standard FR-4 board with solder
>mask.
>
>None of my handbooks gives this value, and several internet searches turned
>up nothing.  Can anyone help?
>
>
>
>Mark Harrand
>SRC Computers, Inc.

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