There are a few materials that cannot go in the oven because they will either melt or catch on fire. These materials include:
-Plastics: Plastics will melt when exposed to high temperatures, so it's best to avoid putting them in the oven.
-Aluminum foil: Aluminum foil can easily catch on fire in an oven, so it's best to avoid using it as well.
-Paper: Paper can also catch on fire easily, so it should be avoided as well.