What You Can and Can't Put in a Microwave

Metals including stainless steel and aluminum foil

Anything made of or containing steel, iron, copper or other hard metals should never go in your microwave. Metal surfaces reflect microwaves, which increases the heat inside the appliance and could lead to a fire. If you&#;re storing leftovers in a metal container, remove the food and place it in a microwave-safe container instead. 

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When it comes to aluminum foil, things can get tricky. Technically foil can be microwaved, but its surface needs to stay as flat as possible. Wrinkles or crumpled foil can cause &#;arcing&#;&#;that is, it can cause electric sparks to shoot across the surface of the foil, potentially damaging your microwave or causing a fire. In addition, food wrapped in aluminum foil may not cook or reheat properly in the microwave&#;the foil will reflect the radio waves instead. Each microwave is different, learn more about how a microwave works or consult your owner&#;s manual to determine if aluminum foil is safe. And when in doubt, avoid placing any kind of metal in your microwave.

The microwave is the workhorse of the modern kitchen, whether at home or in the office lunchroom. All day long, it dependably handles quick grab-and-go chores, as well as more complex food prep chores. But don't take it for granted. To keep it working, here is a look at five things you should never put in your microwave.

Paper Bags

Did you know a standard paper bag from the grocery store can catch fire in the microwave? That's because it doesn't have susceptors, a specialized material that can handle the radio waves produced by the microwave. Popcorn bags have them, but everyday bags don't. As a result, fumes and toxins from the paper get released during the heating process, potentially causing a fire.

Aluminum Foil

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The metal interior of your microwave is made to reflect back radio waves, which are usually called microwaves. These waves are responsible for the electromagnetic energy that warms up food. Aluminum foil reflects back the waves. The results are sparks and potentially a fire.

Plastic and Steel Travel Mugs

These handy cups are perfect for sipping coffee on the go. But don't try to reheat your tea or coffee in them. Steel mugs can cause friction from the buildup of energy in the appliance. Many plastic mugs can't take the heating process. Some plastic on-the-go coffee mugs do say "microwave safe" on the outside. In that case, it's ok to use them.

Eggs too Hard Cook

An eggshell traps steam that forms when the microwave does its job of heating. When that reaches critical mass, it can explode. The result is a very messy, hard-to-clean microwave.

Styrofoam Anything

Takeout is often packaged in polystyrene foam, better known as styrofoam. But don't try to reheat your General Tso's Chicken or your breakfast burrito in the container. The material can melt, releasing unappetizing and unhealthy toxins into your food.

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