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Can a Microwave Explode?

Nearly every home nowadays has a microwave, and we love them for how easy they make mealtimes. But how safe are they from sudden explosions? Can microwave explode?

Microwaves cannot explode. While they can produce enough heat to explode the object inside, the microwave itself is safe from explosion. They are vulnerable to electrical issues that cause fires, though.

This article details the following:

  • How a microwave works
  • Materials that can and can’t go in a microwave 
  • Foods that can explode in a microwave
  • How to care for your microwave
Can a microwave explode

How a Microwave Works

A microwave oven, more commonly named microwave, uses electromagnetic radiation to heat and cook food items by sending energy called microwaves into foods, specifically into sugars, water, and fats. A device called a transformer inside the oven is used to increase the household current, and then another device called a magnetron converts it into electromagnetic waves.

The microwaves are longer than infrared waves but shorter than radio waves. These microwaves are bounced around inside the space until they hit the food, where they become attached. They cannot penetrate very far in, so first, the outside of the food cooks from the microwaves, and the insides are cooked from the transferable heat, but of course, this takes much longer. 

The rotating glass plate, or turntable, also helps produce an even cook because, inside the microwave chamber, the microwaves from static energy columns called standing waves. Rotation is necessary for the waves to reach the food uniformly.

This is why, especially with older models that may not have a rotating plate, it is recommended to stir or move food as it cooks to ensure an even temperature and cook. There are few materials not to put inside to prevent microwave blowing up.

Materials That Can and Can’t Go in a Microwave

The only things that should go into a microwave are foods, liquids, and microwave-safe containers, but sometimes there can be doubts about what is safe. Always read the packaging and instructions of food packets before putting them into the microwave, and avoid putting sealed packets inside unless following the manufacturer’s guidelines.  


Glassware or ceramics are generally microwaveable as long as they don’t have any metallic inlays or decorations. 


Single-use plastics, such as yogurt or cottage cheese pots, and old or cracked plastic containers should not be used in the microwave. Non-microwavable plastics can potentially melt and leave toxic particles in your food. Plastic bags such as freezer bags should also not be used unless otherwise deemed microwaveable by the manufacturer. 

Can a microwave explode

Durable plastics, such as Tupperware or a microwave cover, are okay. You might think Styrofoam would be okay in the microwave, but it is still plastic and should not be used. 


Hard metals should never be put inside a microwave because they intensify the heat and can cause fires. Aluminum foil can be used but should be as smooth as possible because any wrinkles can cause arcing, which causes electric sparks to shoot out, potentially causing a fire or damage to your microwave.

Also, since the metal reflects electromagnetic waves, it can even prevent your food from heating, so if in doubt, avoid using any metal. 

Paper or Cardboard

Papers like a kitchen towel can be used in a microwave, but always check the packaging information because items like paper plates have a thin plastic layer on their surface and should be avoided.

Brown paper bags should also not be used as they cannot withstand large amounts of heat and cause fires. Cardboard is inadvisable to use in a microwave as it contains elements of glue and other materials. 

Foods That Can Explode in a Microwave

Various items can explode in a microwave, but some are more prone than others. Food that has a seal can explode, so when you cook something like a potato, it is advisable to poke a few holes in the skin to avoid the water inside the potato from heating into steam and exploding to release that steam.

Grapes, eggs, and hotdogs are also foods that should not be used in a microwave because they are more likely to explode and unable to handle higher temperatures. Eggs especially should not be cooked, as you cannot put holes in an egg before cooking it, unlike other food items that could explode. 

Sauces, dips, or liquids are also at risk of explosion, so placing a lid or cover on top is advisable to reduce splashes or strains inside the chamber. Water can also explode in a microwave and can be dangerous, as it boils without visible signs. When heating water, it should be carefully monitored and checked regularly to avoid burning. 

How to Care for Your Microwave

Keep Your Microwave Clean

Food particles can often get spattered inside the microwave, but this prevents the machine from working as efficiently, so always use a damp cloth to eliminate any remaining food. You can loosen tough stains by heating a measuring cup with two cups (450ml) of water on high power for a few minutes. You can also add some lemon juice to the water to leave your oven smelling fresh. 

Once boiling, turn off the microwave and allow the cup to stand and cool before removing. The steam will help soften any remaining food or liquid and make cleaning easier. The glass tray can also be removed and washed separately. Allow it to cool if hot before putting it in the dishwasher or washing up bowl. 

Can a microwave explode

It is recommended to clean the outside of the microwave and use a damp cloth to avoid attracting bugs or bacteria. It is important not to use too much water as this can seep into the machine and damage the working parts.

When cleaning any part of the microwave, it is important not to use harsh or abrasive kitchen cleaners. This Samsung MG14H3020CM is extremely easy to clean, given its smooth surfaces.   

Never Use the Microwave Empty

Never turn on the microwave if the chamber is empty, as this can damage the magnetron inside or even the glass tray. A helpful tip is to leave a cup of water inside if the microwave is accidentally turned on. However, be careful not to leave water cooking too long in the chamber because it can boil without bubbling and cause burns if removed while still hot. 

Ensure the Door Closes Properly

If the door to your microwave doesn’t seal correctly, radiation could be escaping into the room, and the food will not be being cooked properly. Regularly check the seal of your microwave to prevent this from happening. 


We generally think a microwave oven is a safe and quick alternative to a countertop stove or traditional oven. While that is mostly true, and we have learned that microwaves do not explode, it is still important to exercise caution to ensure no accidents.

Because there is no guarantee, with new tech and techniques, there is a chance your microwave blew up.

This also prevents exposing ourselves to damaging chemicals or radiation caused by improper appliance use. 


  • Nicole Sutton

    Nicole Sutton is an enthusiastic writer and knowledgeable contributor to She offers a plethora of knowledge to the platform, with a background in environmental science and a profound curiosity with all things connected to temperature regulation. Nicole's interesting and informative writings assist readers in making informed decisions about home heating, cooling, and climate control.

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