If consumers use oil on the stones and clean them using a 550 degrees Fahrenheit oven or using the oven’s self-cleaning cycle, as currently recommended in the instruction booklets accompanying the stones, the stones can catch on fire.
Because the stone is unglazed and can absorb cooking oils, we recommend that you use your stone only for baking pizza, breads, and other “low-fat” baked items. Avoid recipes calling for shortening (butter, lard, or margarine) or oil.