I just stumbled onto this industrial material surplus yard. Good thing it’s not close to me or I’d be spending a lot of cash there. This high temperature insulation looks interesting. I’m not sure what it’s rated for. Apparently they have several warehouses around the country but headquarters is in Illinois.
https://seattle.craigslist.org/see/mad/d/unused-rayon-felt-insulation-heat/7206556441.html
