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'[EE]: Heat-sink conductive material?'
2002\07\03@213506 by Pic Dude

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Hey folks,

I need to find some sort of material that I can place
between a TO-220 device and a heatsink, that would
"fill" an uneven gap.  I only know of mica sheets and
thermal heat-sink grease (which I'm using), but I'm
need something more "squishable" that will conform to
the shape of the gap when squeezed.  Of course, if
needs to promote thermal heat transfer, but does not
matter if it conducts electricity or not.

No, it's not easy to adjust it so that the surfaces
are more parallel to each other.

Cheers,
-Neil.

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2002\07\04@105551 by Michael Rigby-Jones

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{Quote hidden}

Several manufacturers make the material you are looking for. Raychem is one
of the larger and make a range of products under their "HeatPath" brand
name.  Thickness up to 15mm can be obtained, although the thermal
conductivity is not great when you use larger the thickness material.

If you can find a local distributor you can probably extract a sample pack
of all the common types that they sell.

Regards

Mike

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2002\07\04@123045 by lab

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www.powerdevices.com/isostrate2000.htm

Marcelo Y.

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2002\07\04@152841 by miked

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We used some stuff called Silpad(commerical name?). A gray sorta smooth cloth
looking stuff. Both insulates and conducts heat.
> Hey folks,
>
> I need to find some sort of material that I can place
> between a TO-220 device and a heatsink, that would
> "fill" an uneven gap.  I only know of mica sheets and
> thermal heat-sink grease (which I'm using), but I'm
> need something more "squishable" that will conform to
> the shape of the gap when squeezed.  Of course, if
> needs to promote thermal heat transfer, but does not
> matter if it conducts electricity or not.
>
> No, it's not easy to adjust it so that the surfaces
> are more parallel to each other.


Mike DeMetz N9GEZ
Elkhart, IN
@spam@n9gezKILLspamspamqsl.net
http://www.elkhart.net/~miked

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2002\07\04@182412 by Peter L. Peres
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On Wed, 3 Jul 2002, Pic Dude wrote:

>Hey folks,
>
>I need to find some sort of material that I can place
>between a TO-220 device and a heatsink, that would
>"fill" an uneven gap.  I only know of mica sheets and
>thermal heat-sink grease (which I'm using), but I'm
>need something more "squishable" that will conform to
>the shape of the gap when squeezed.  Of course, if
>needs to promote thermal heat transfer, but does not
>matter if it conducts electricity or not.
>
>No, it's not easy to adjust it so that the surfaces
>are more parallel to each other.

There are silicone pads loaded with something. They are dark gray. I don't
know who makes them, maybe someone else on the list does. They have a
raised 'tube' that fits in the hole of TO220 devices so only a normal
washer is needed. They are good to 2kV or so.

Peter

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