Question: Can you microwave cardboard? Can you put cardboard in the microwave?
Short Answer: Yes, you can microwave cardboard.
Longer Answer: It is safe to microwave cardboard as long as you pay attention to a few things like:
- Make sure that the cardboard doesn’t have any kind of metal inside. Some cardboard boxes have small metal handles to keep it together.
- Make sure that the cardboard is not coated with a plastic layer.
- Make sure you don’t add just the cardboard, without any food on it, for a long time. If you microwave just the cardboard for a long period of time, it might catch on fire. But if you have something on it (used as a paper plate to reheat your pizza), you are safe because there is moisture to take the microwave’s energy.