Can You Put Aluminum Foil in the Microwave?
Generally, no - aluminum foil should not be put in the microwave. Metal reflects microwaves, which can cause sparks, fires, and damage to your microwave. However, some manufacturers allow small, flat pieces for shielding food if specific guidelines are followed. When in doubt, avoid metal entirely.
Key Takeaways
- Microwaves work by producing electromagnetic waves that are absorbed by water, fats, and sugars in food.
- Foil containers from takeout should never be microwaved unless specifically labeled microwave-safe.
- The inside walls of some microwaves are metal - this is designed differently and does not cause problems.
Explanation
Microwaves work by producing electromagnetic waves that are absorbed by water, fats, and sugars in food. Metal reflects these waves rather than absorbing them, which can cause electrical arcing (sparks) that may damage the microwave or start a fire.
The risk is greatest with crinkled foil, foil with sharp edges, or large pieces. Small, flat pieces of foil used to shield parts of food (like drumstick ends) may be acceptable according to some microwave manufacturers, but always check your specific manual.
A safer alternative is microwave-safe covers, wax paper, or paper towels for covering food. If you need to shield part of a dish, consider rearranging the food or cooking in batches rather than using foil.
Things to Know
- Foil containers from takeout should never be microwaved unless specifically labeled microwave-safe.
- The inside walls of some microwaves are metal - this is designed differently and does not cause problems.
- Even microwave-safe metal accessories should be used according to the microwave's instructions.