Thickness of electrical insulation for resistance heating coil

[nothvac]

For resistance heating coils (NiCr60) that are 30 gage, what are some of the methods to electrically insulate them? I need something that is at most 4mil thickness (0.004") due to space constraints.

So far options I looked at include ceramic, wire coating resins, thermally conducting epoxy, and aluminum oxide coating. Is there any option I have not explored yet?

Thanks.

 

[MintJulep]

Kapton.

http://www2.dupont.com/Kapton/en_US/