Here’s What Those Black Dots On Your Microwave Door Are For

There are some kitchen appliances you probably use on a daily basis that you don’t think twice about including a toaster oven and microwave. Speaking of the latter, have you ever wondered what the black dots on your microwave’s door are for? If that thought has crossed your mind, then you’re not alone. The black dots on a microwave aren’t just decorative; they serve a functional purpose .

We spoke with a home expert about what the black dots on your microwave door are for and other important details you’ll want to keep in mind.

What Do the Black Dots on a Microwave Do?

The black dots on a microwave door serve two purposes in terms of design, functionality and safety.

They prevent microwaves from escaping.

The black dots on a microwave are there are a safety measure to prevent the microwaves from escaping the cavity. This works because the microwaves can’t pass through metal, hence why the whole contraption is enclosed by metal on four sides.

“The wavelength of a microwave is larger than the distance between the dots so the microwaves stay contained,” says Thomas Borcherding, owner and lead designer at Homestar Design Remodel.

Microwaves have a wavelength of approximately 12 centimeters and can’t pass the grid, so it goes back to reheating the food inside, whereas visible light is smaller and can penetrate through.

They allow you to see your food.

The black dots are actually smaller than microwave rays which keeps them contained while while simultaneously letting visible light go out so you can see your food as it heats up. This can be helpful for making sure you don’t burn it or watching to see if it explodes so you can take action.

Do All Microwaves Have the Black Dots?

Yes, all microwaves have the black dots on the door as it is a crucial safety feature. As mentioned above, the metal mesh ensures the radiation stays inside while still promoting interior visibility.

“Due to a microwave’s black dots, people are better protected from thermal burns that could happen if the microwaves were to escape and one was standing close by,” Borcherding says.

Not only do microwaves have these black dots, but also many conventional ovens also have similar dots on the doors for similar reasons. They help with insulation and protect the door from heat damage caused by extremely high temperatures.

Do the Black Dots Wear Off?

According to Borcherding, the black dots on a microwave can become damaged over time, although it’s not common with correct use. If damage is present, then the microwave door (or the unit as a whole) should be replaced for your own safety.

In many cases, leftover food residue caked onto the screen may create the appearance that the black dots are wearing off when the door just needs a good cleaning so you’ll want to investigate before purchasing a new microwave.

About the Experts

• Thomas Borcherding, owner and lead designer at Homestar Design Remodel.

Sources

• Maytag: Parts of a Microwave: Microwave Parts Diagram

• Tasting Table: The Reason Your Microwave Door Has A Mesh Grating

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