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Thermal insulation material

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ceoxrad:
Hello everyone. This question is somewhat related to a problem I'm facing with my laptop (link to that thread down below), but since this is more related to electronics and may be of use to other people I open a thread here.

Does anyone know a thermal insulation material available in thin sheets (<=1mm) that can be used to shield an hot PCB (50-60 *C) from a plastic enclosure?
I'd like to insert a layer of the stuff between the metal rollcage of a laptop and the outside plastic bezel. I've looked into rubber insulation tape used in HVAC but it's far too thick.

Any help is appreciated, Thank you all

Original thread in computing: https://www.eevblog.com/forum/general-computing/thinkpad-w540-and-ubuntu/

Gyro:
This doesn't sound advisable. The only reason that the PCB is maintaining 50-60'C is that it is losing heat through the case. If you start adding thermal insulation, then the temperature of the PCB is going to run hotter, possibly to the point of failure.

EDIT: Sorry, for some reason I read this as laptop adapter.

ceoxrad:
Thank you for the input.

I understand the problem, but I don't want to insulate the whole area, just a tiny spot under the palmrest.

The PCB is located inside a metal rollcage that heats up when the device is in use.

I attached a picture with the area I intend to insulate, directly below the palmrest. Mainly is that thin flap of metal over the expresscard slot.

I should have explained better in the first post (sorry!). The pcb is not directly underneath the palmrest.

Do you think that is feasible in this case?

Marco:
With that little space you won't do better than an airgap and limiting radiation (well, except for vacuum and limiting radiation).

Spray both surfaces with reflective paint and use standoffs to maintain an airgap for most of the area.

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