Its called Ceramic Paper because of appearance not that its as thin as paper literally. There are several thicknesses I have used 1/16, 1/8, and 1/4 inch. The 1/16 is extremely fragile and much to soft to handle without it tearing and falling apart, it really is only good as gasket material. The 1/8 and 1/4 are quite a bit different they have a spattered surface texture like it was sprayed on and it makes the material tougher and easier to work with as well as being thicker.
Koffee Kosmo wrote:Ceramic paper may be too thin
However ceramic insulation 6mm to 12 mm thick is probably ideal
This type of insulation is normally used in kilns and would exceed your requirements
KK