Testing Faraday Bags

Testing Faraday Bags

Do Faraday bags work? There’s a lot of misinformation about what a Faraday cage (or bag) protects against.  The basic belief is that Faraday bags are designed to block radio wave transmissions, act as an insulator to protect against electronic currents, block tracking and hacking.  Federal agencies and local law enforcement officers use them to protect information and evidence (cell phones or laptops) from being hacked and tampered with.  Preppers use them as a precaution against an electromagnetic pulse (EMP) from a bomb or astrological event.  Nonetheless, are all Faraday cages and bags created equal and how protected are we really?

Mylar Bags vs Faraday Bags

Mylar bags and Faraday bags look the same so how are they different?

Testing Faraday Bag - Mylar vs Faraday

Mylar bags are made of a transparent polyester resin and coated with aluminum.  The thickness of the Mylar bag is 3.5 mils.

A Faraday Defense bag has five layers made up of static dissipative polyethylene (plastic), aluminum, polyester, aluminum, and the final coat dissipative polyethylene polyester.  The thickness of it is 7 mils.

The thickness and protection from light is apparent in the picture above.

 

Testing Faraday Bags

I decided to try some basic tests with the Faraday bags before stashing them away and I am so glad I did.  The outcome of the tests were surprising!  It definitely changed how I’ll be protecting my electronic devices.  Supplies used to conduct the tests:  tinfoil, cell phones, walkie talkies, a radio, and two Faraday Defense bags.  Watch the following video to see if the Faraday bags work.

 

 

What are Faraday Bags Designed to Block?

Faraday bags are designed to block radio frequency interference (RFI), also known as electromagnetic interference (EMI), and Radio-frequency identification (RFID).  Attenuation or dB is what you’re looking for when shopping for Faraday bags.  Attenuation is the measurement of how effective the shielding is.  Anything above 60dB is considered very good protection.

Since the bags failed two out of the three tests, it raised the question:  why didn’t they block the radio frequency better?

Answer:  My best guess, based on the test, is not enough shielding.

After researching and testing the Faraday bags,  I’ll be adding extra protection to each electronic device.  Each item will be wrapped in plastic to act as an insulator, then wrapped in two layers of tin foil, and lastly placed in the Faraday bags for anti-static shielding.

There are a couple of things I liked about the Faraday bags.  First, I like that the bags seal completely.  The zip-locking seal also protects the contents from moisture.  Second, it’s easily accessible and compact, unlike most Faraday cages.

 

Ideas on What to Store in a Faraday Bag

testing-faraday-bags-2

  1. laptop
  2. cell phone
  3. solar charger
  4. solar light
  5. flashlights & rechargeable batteries
  6. tablet
  7. walkie-talkies
  8. radio (NOAA emergency weather radio, AM/FM, shortwave radio, ham)
  9. external memory devices
  10. led light bulb
  11. calculator
  12. alarm clock
  13. small DVD player with monitor
  14. glucose tester


About PreppersSurvive 104 Articles
Welcome to my site! My name is Nettie and I started this blog to provide simple tools to help Preppers.  I am not a Doomsday Prepper! I am more of a Girl Scout Prepper. “Be prepared! A Girl Scout is ready to help out wherever she is needed. Willingness to serve is not enough; you must know how to do the job well, even in an emergency" (the motto, in the 1947 Girl Scout Handbook). Being a Prepper has been a blessing to me, my family, and friends on more then one occasion. You'll find these stories throughout this blog.  You will also find prepper supplies checklists, prepper events, cheap food storage ideas, emergency heat sources, survival books recommendations, reviews on power outage lights, printable prepper pdfs, and articles on emergency disaster preparedness.  Click here to read more

5 Comments on Testing Faraday Bags

  1. Nice article. Though I’ve tried these bags and they don’t really seem to work that well. I used the md faraday bags tester app and they didn’t block wifi or cell signals. Just FYI as I recently got other bags and they do the trick. I know that EMI protection relates to radio frequency blocking, they are similar in effect. If the bag blocks radio frequencies it will likely block emi. Thanks for the info, you did a nice and thorough job. I am a big fan of this site and we take a lot of tips from here. Thanks!

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