Chomerics makes a thermally conductive pressure sensitive tape that is .005"
thick.  The thermal conductivity is 0.37 W/m-K (or 2.57 BTU In/Hr F Ft^2).
It's called CHO-THERM THERMATTACH 404.  They're located in Woburn, MA (617)
935-4850.
Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>


        -----Original Message-----
        From:   <Peter George Duncan> [SMTP:[log in to unmask]]
        Sent:   Thursday, June 07, 2001 10:33 PM
        To:     [log in to unmask]
        Subject:        [TN] Thin Thermal Pad Materials

        Hi, Everyone,

        We are working on a conduction-cooled VME SMT board design for an
avionics
        application. It requires a 7 degree C thermal gradient from Chip die
at the
        board centre to card the edge, which may be impossible, but we're
trying so
        I need your advice.

        I'm looking for a highly efficient thermal material 0.30mm thick +/-
0.03mm
        and a material 0.15mm thick +/- 0.03mm to fill component air gaps
and other
        material interfaces. It should have double-sided adhesive, and
require an
        absolute minimum attachment pressure.

        I cannot find any materials anywhere, myself, that aren't 0.25mm or
0.5mm
        or thicker. And there's nothing as thin as 0.15 finished thickness
even in
        thermal tapes. We don't want to use greases or anything silicone
either.

        Any ideas, anyone, as to where I might find a material souce to meet
such
        requirements?

        TIA for your ever-wonderful ideas.

        Pete Duncan


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