Cheap material, thermally conductive, electrical insulator, heat resistant 60C?

[Nuttyboltz545]

Hi I am looking for a material with the above properties, I am leaning toward the material used for common thermal-pads however I do not know the name of this material, nor where to buy it on a large roll.
The material needs to be cheap as each product will use a large amount, ideally I want the roll to be 300-500mm wide.
Any Ideas?

[Benta]

3M is probably the best source:
https://www.3m.com/3M/en_US/p/d/b10469519/
Otherwise search for:
"thermally conductive silicone sheet"

[jpanhalt]

BN epoxy (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6723785/)
BN = boron nitride
Sometimes called white graphite is it is slippery like graphite.  You could make your own paste.

[Phoenix]

Berquist make the SIL PAD, they are ubiquitous in electronics... Perhaps you can also find cheap no name versions.
https://www.henkel-adhesives.com/us/en/products/thermal-management-materials.html

[Nuttyboltz545]

The legit stuff is pretty pricey, alibaba grade would be good for my application though.
Thanks

[Nuttyboltz545]

I am more after the foam style material with some thickness, the product is a heated pad for an animal, so I want to keep the nichrome wires a distance away from the skin, it just needs to conduct heat well for a foam.
I have seen pads like this in products I have dismantled, never a large one though, really anything with half decent thermal properties will do, just need decent conduction on a 3-4mm thick pad

[pqass]

I was going to suggest Kapton (polyimide); comes in sheets or tape of various widths.  Expense is debatable.
See comparison here: https://sound-au.com/heatsinks.htm#s7

But given your last post, I think you're looking for what they put in consumer electric blankets/pads.

Fiberglass cloth/fabric maybe? 
Properties: http://www.lewcospecialtyproducts.com/products/reinforcement-coating-laminating-fabrics/properties-of-fiberglass-fabrics/