Extreme high heat gasket material High Temperature Gasket Sheet
For stuff that high typically you'd use Mica or Asbestos. You might be able to find some nonwoven ceramic sheets that would work. Don't forget Join this channel to get access to perks: What is the Ultra-High Temp Non-asbestos sheet gasket material? What are high temperature silicone rubber sheets? How To Make Your Own Gasket - Stacey David's Gearz #shorts ...