Naturals Commercial 18-inch Half Baking Sheet

While it is technically dishwasher safe, the manufacturer recommends hand washing to prevent discoloration. The aluminum can oxidize and turn a dull gray color when exposed to harsh dishwasher detergents, though this does not affect the pan's performance.

Nordic Ware's Naturals line features a reinforced encapsulated steel rim that significantly resists warping. While extreme temperature changes can cause any metal to flex, this pan is designed to maintain its shape even at high baking temperatures.

You don't have to, but it is highly recommended. While the aluminum provides excellent heat conductivity, it is not a non-stick surface. Using parchment or a silicone mat makes cleanup much easier and prevents delicate items like cookies from sticking.

Yes, you can use metal spatulas or whisks on this pan without worrying about damaging a non-stick coating, as there is none. However, be aware that metal tools will leave surface scratches on the aluminum over time, which is purely cosmetic.

Yes, the 18-by-13-inch dimensions are the industry standard for a 'half sheet' pan. It is designed to fit perfectly into almost all standard residential ovens, but it is always a good idea to measure your oven interior if you have a compact or European-style model.