Ceramic Fiber Insulation Board (2300F) (1/2" X 19.7" X 39.4") Pack of Individual Board for Wood Ovens, Stoves, Forges, Kilns, Furnaces Aluminosilicate Refractory Ceramic Fiber Board-MADE IN INDIA Maximum Use Temperature: 2300 F(1260 C) | Density: 20-24 lb/ft Compressive Strength at 25% deformation - 78 PSI Permanent Linier Shrinkage - 3.5% Max at 2200 F when exposed to 24 hours soaking heat Loss of Ignition(LOI) at 1832 F : 4-7%