We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is an EMF Shield?

Mary McMahon
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

An EMF field is a component of the structure of a device or object which is designed to provide some shielding from electromagnetic fields. Such fields can interfere or severely disrupt the normal operation of a device, making shielding very important, especially with delicate equipment like sensitive scientific instruments. Most electronic devices are required by law to include EMF shielding, and citizens of some nations may note that such devices are often stamped with information indicating that they comply with laws requiring EMF shielding of electronics.

Typically, an EMF shield is designed both to prevent electromagnetic fields from interrupting a device, and to limit the electromagnetic field generated by a device so that it cannot interfere with other devices. While such shielding cannot be perfect, it can be very high quality, making it difficult for EMF disruptions to occur.

A simple example of an EMF shield is a component in an electrical cord which covers the conductive area of the cord and lies underneath the insulation, designed to prevent the field generated by the passage of electricity through the cord from spreading. EMF shields are also used in the casing and housing of electrical devices in the same way. These fields can protect from electromagnetic radiation, but they will not necessarily block radio waves.

Even a good EMF shield, such fields can still cause disruptions. For example, leaving a cell phone next to a computer monitor can distort the display, even though both devices are theoretically shielded. Concerns about electromagnetic fields have also led to requirements to turn off devices such as cell phones and computers in certain environments. In a hospital, for example, cell phones are not allowed in some areas because they could interrupt medical equipment, and on aircraft, the use of electronic devices is restricted due to concerns that they could interfere with the operation of the aircraft.

A more sophisticated variation on the basic EMF shield known as a Faraday shield or Faraday cage provides additional protection, and may be used around sensitive equipment or when very high volumes of electricity are being used. Whatever the type, an EMF field must be regularly evaluated and tested to confirm that it is working properly, as degradation of the shield can cause it to malfunction. Consumers may also have noticed that older devices can have imperfect shielding, caused by different manufacturing standards or natural wear and tear which damaged the EMF shield.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a About Mechanics researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments
By anon289165 — On Sep 03, 2012

Do these waves pose any danger like EMFs? I read that EMFs may be potentially harmful to small children. I would love to learn if there are any potential negative effects.

By anon282544 — On Jul 30, 2012

Can an EMI wave interfere with implanted medical devices such as pacemakers? If so, why do the manufacturers of such devices create a shielding box around such devices?

I know that persons with pacemakers can not have MRI's. Can a Faraday box eliminate EMI waves from the sun's EMI waves?

By anon255616 — On Mar 18, 2012

What about protecting your car?

By SZapper — On Jul 31, 2011

@strawCake - Well, maybe that guy had never flown before. On the other hand, it's not that hard to follow the directions. They do announce it over the speaker system if I remember correctly.

I actually got in trouble awhile ago in a hospital. I had no idea you weren't supposed to use your cell phone in certain areas. I was visiting someone and merrily chatting away on my phone while I was waiting for the doctor to get done with them. Imagine my surprise when a nurse politely asked me to finish my phone call elsewhere!

The nurse was nice, but I was still a little embarrassed. Next time I go visit someone in the hospital I'm going to turn my phone off and leave it in my purse!

By strawCake — On Jul 30, 2011

I'm not that familiar with EMF shielding, but I do know that you're not supposed to have your cell phone on when a plane is taking off. Until recently, I thought everyone knew that.

However, on the last flight I was on, the guy behind me would not turn off his phone! They announced it over the speaker system several times and finally the flight attendant had to make him do it. I don't know if he was experiencing some jitters about flying or something, but I thought it was a little ridiculous!

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.