All of these products are electrical insulators.  I would have suggested also that Raychem and Chomerics make sheets of thermal conductive material that can be cut into any shape, but all of these are electrical insulators as well. 
The difficult part of what Bob is asking for is the electrically conductive property.  Chomerics has one product that has a foil carrier material to be able to apply a stronger adhesive to the material but the foil is only on one side.  We stopped using it because we got some solder peaks on signal vias that pushed thru the soft thermal material and grounded to the foil which was against the grounded heatsink.  The heatsink grounding was accomplished thru the screws which we used to mount the heatsink to the pcb.  We had pemnuts installed in the heatsink for the mounting.
-----Original Message-----
From: Anselmo, John [mailto:[log in to unmask]]
Sent: May 30, 2001 10:24 AM
To: [log in to unmask]
Subject: Re: [TN] conductive epoxy prepreg

3M makes both of these products.  Go to

http://www.3m.com/bonding/html/thermalcond.html

Regards,
John

-----Original Message-----
From: <Bob Mcgarry> [mailto:[log in to unmask]]
Sent: Wednesday, May 30, 2001 9:58 AM
To: [log in to unmask]
Subject: [TN] conductive epoxy prepreg


Does anyone know of a electrically and thermally conductive epoxy prepreg that can be used to bond PCB's to heatsinks. Material must be conductive and have the properties of a no-flow type prepreg to avoid flow into gaps in the heatsink.

Thanks,


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