To be safe, don’t put cardboard in the oven. Cardboard has an ignition point of 427 degrees. Theoretically, if the cardboard stays under this temperature, it won’t ignite. However, there is still a chance it will catch on fire depending on the style of oven that you have.

At what temperature does cardboard ignite?

Cardboard doesn’t catch fire until temperatures reach over 400 degrees. But to be safe, we recommend you keep your heat at the suggested setting of 170.

Long story short, the safest option is to avoid putting any cardboard in the oven. Even at your oven’s lowest temperature, there’s a chance of spontaneous combustion or fire from putting cardboard in the oven. Manufacturers create cardboard with a paper structure and a corrugated board.

Is it safe to put a pizza box in the oven?

Can I put a pizza box in the oven? No, you cannot put the whole pizza box into the oven. This is because the highest temperature a pizza box can allow without setting itself on fire is 400°F. Anything higher than this set on the oven will require the immediate assistance of firefighters.

The average cardboard pizza box is quite thin and sometimes has a liner parchment paper on the bottom. Both these materials have the risk of catching fire at around 400 degrees. This makes it a potential fire hazard should you accidentally turn your oven up too much!