Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I am too trying to figure out the flexible mica, a source part number would be great but perhaps I have one... Thoughts on the below?

I am thinking I am needing this to wrap about the iron heater brace for a B31 heater retro fit.  I am sure it is smart to have the mica in between anything doing with the heater to the tank (my assumption incase there is an electrical short of any kind).  I have read that @Junkologist says .15mm and at https://www.mcmaster.com/mica-sheets/ the closest I see is 0.004" or 0.008" (I am pretty sure .15mm should be just about .0060" inches).  

So I am thinking McMaster's Flexible Electrical-Insulating Mica 0.008" 85825K42?