Amazon.com: BXI Ceramic Fiber Thermal Insulation Board(2732F) - 12'' X 8'' X 0.8'', Pack of 1 - Inorganic - Flame Retardant, Heat Resistant, High Temperature Insulation : Industrial & Scientific
Amazon.com: Simond Store Ceramic Fiber Insulation Board - 2300F Rated - 0.47 Inch X 18 Inch X 24 Inch - Pack of 1 - Ceramic Thermal Insulation Board for Wood Stoves Fireplaces