Plastic, including Tupperware
While some plastic containers are safe for use in the microwave, there are a few you should avoid. Single-use plastics like those used for yogurt, cottage cheese and other foods should never be microwaved. The same rule applies to plastic to-go containers that don’t clearly state that it is microwave-safe. Similarly, do not use cracked, old or discolored plastic containers. Plastic containers meant for longer-term use, such as Tupperware, are generally best for microwave use.
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Paper towels
Most paper towels are microwave-safe. In fact, you can use a paper towel to cover some foods so they don’t spit during cooking or reheating. If you do use a paper towel while microwaving, it’s best to use shorter intervals so you can check both the food and the paper more frequently. Recycled paper towels, paper towels with printing, paper lids and brown paper bags should not be used as they pose a potential safety hazard.
Ziploc bags
According to Ziploc, their food storage bags are safe for defrosting or reheating foods in microwaves, “when label directions are followed.” If you prefer a different bag storage brand, confirm that they are microwave-safe and follow any and all directions. If you aren’t sure what type of bag you’re using or don’t have access to the directions, play it safe and keep the bag out of the microwave.
Cardboard
If you can microwave paper plates and towels, can you do the same with cardboard? Both are paper products, after all. Unfortunately, cardboard can contain glues, waxes and other materials that can make it a safety hazard in the microwave. Some cardboard takeout boxes even have metal handles or fasteners that can cause sparks and present a fire hazard. Keep your microwave (and your family) safe by removing food from cardboard containers and placing them on microwaveable plates or in microwave-safe bowls.
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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.
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.
How to know if something is microwave-safe
Though there are general guidelines when it comes to microwave-safe containers, there are always exceptions. If you aren’t sure whether something can go in the microwave, check the back or bottom to look for a microwave-safe label or symbol. If you can’t find one, try to determine what the item is made of—this will give you a better idea if it’s ok for microwave use. If you can’t tell what a container is made of, just remember—when in doubt, leave it out. It’s the best way to ensure that your microwave will stay in top shape for years to come. Learn more about how to use your microwave.
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