Is It Safe To Put Cardboard In The Microwave?
Cardboard packaging is everywhere, from takeout boxes to frozen dinners. When you're in a hurry, it’s tempting to toss it straight into the microwave. But is it actually safe? The answer depends on the type of cardboard and how it’s made.
Here’s what to know before heating anything that comes in a cardboard container.
Is it safe?
Cardboard is made out of flammable paper fibers, so there is always a risk that they could ignite when exposed to the high heat of the microwave.
However, some cardboard containers are designed specifically for microwave use, so it's important to always check for a microwave-safe label.
Coated or printed cardboard can be especially hazardous
Cardboard with glossy coatings, colorful designs, or metal parts can release fumes or catch fire in the microwave. The heat can cause chemical leaching or sparking.
Boxes with plastic windows or foil linings should also never go in. These materials aren't made to handle direct microwave heat.
When in doubt, transfer your food
If you're unsure, it’s safest to use glass or ceramic containers instead. It only takes a few seconds to transfer your food, and you’ll avoid damage to your microwave or risk of fire.
A little caution keeps your kitchen safer and your meal just as warm.