It would be great to be able to source the material that heatpads are made from. I mean the material that looks like a rubber compound that is often under stock CPU/Heatsink combinations that conducts heat. I want to use it for the underside of hard drives and other uses (not CPU's of course). So it needs to be about 1/8" thick at least.

You can buy thermal transfer tape at electronics shops. For example here in Oz my local is Jaycar which sells this stuff: linky

3M make a range of products, so you should be able to source one of these to suit. Here's a pdf of those: linkky

Is that the stuff you're talking about?

Potsy

Lol....I could have just punched in "Thermal tape" on Ebay and found tons....thanks for the links. Especially the PDF.

Interesting note on the shelf-life of this thermal tape in that pdf:



Kinda makes you wonder how long it's rated for when subjected to 40-60 C on a fairly regular basis while system is in operation.....

they're made from Silicon Rubber but no more info

jan-huei.com

A generic, plain looking pad I recently bought had some grains in it, silverish looking. While it is more probable that this is a marketing gimmick (like those special particles in washing powders), there still might be some merit to it, and who know, maybe this is sth better than good ol' silicon.