Can cardboard go in the oven
Cardboard can not be put into the oven. Cardboard is usually made of cellulose, which is not resistant to high temperatures and is easy to burn. The ignition point of ordinary cardboard is generally 130-255℃, and the maximum temperature of the oven can easily reach this range, so putting cardboard in may cause a fire.
Here is the alternatives:
Use aluminium foil: aluminum foil is a heat-resistant alternative that can be used in the oven. It is commonly used for baking and roasting, and is effective in reflecting heat and preventing food from sticking.
Disposable baking trays: These trays are designed specifically for use in the oven and are usually plain on both sides, making them safe to use.