Microwaving food inside cardboard boxes is generally not safe and is not recommended. Cardboard is not microwave-safe and can pose several risks when exposed to microwave radiation.
Here are a few reasons why it's not safe to microwave food inside cardboard boxes:
Fire hazard: Cardboard is flammable, and microwaving it can cause the box to catch fire. The heat generated by the microwaves can ignite the cardboard, leading to a potentially dangerous situation.
Chemicals and toxins: Cardboard boxes are often coated or treated with various chemicals, including adhesives, dyes, and inks. When exposed to high heat, these chemicals can leach into the food, posing a health risk.
Uneven heating: Cardboard can block or absorb microwaves, preventing the food from heating evenly. This can result in hot spots or unevenly cooked food, increasing the risk of burns or foodborne illnesses.
It's important to transfer food to microwave-safe containers before heating them. These containers are typically made of glass, ceramic, or microwave-safe plastics explicitly labeled for microwave use. Always follow the manufacturer's instructions and use appropriate containers to ensure the safe and even heating of your food in the microwave.