What Material Blocks RFID?

When it comes to what materials block RFID, there is a handful that is most often used by manufacturers. Metal, in most instances, interferes with the signal between the scanner and the microchip. The following are the most often utilized materials:


Many individuals choose to make their RFID-blocking goods out of aluminum foil, which is a common household material. 

It provides enough security, particularly when wrapped directly around your credit cards or passport. It is, however, extremely poor in comparison to other materials and isn’t built to endure a long period.

Aluminum foil, despite its low cost, is prone to creasing and ripping. Data may be transmitted via a breach if the protective layer has been breached. It’s also a pain to have to take your cards out of the aluminum foil every time you want to use them.

These problems, however, only occur with homemade RFID blockers. Because aluminum is so inexpensive, several manufacturers utilize it in their RFID-blocking wallets and passport holders. 

This kind of metal is considerably thicker than store-bought aluminum and can provide enough protection for your sensitive data.


Mu-metal, a human-made alloy including iron, copper, chromium, molybdenum, and up to 80% nickel, is by far the most common kind of material utilized in these specialized accessories.

Moreover, It was created in the early twentieth century and is recognized to be one of the few metals with very high permeability. This metal, which was originally used for telegraph lines, is often found in RFID-blocking products.

The primary issue with mu-metal is that it primarily protects data from low-frequency magnetic fields. When the typical hotel keycard has more than 200 kHz, these fields will have to be around 100 kHz or less.

Carbon Fiber Faraday Shields:

When looking for RFID-blocking accessories, you’ll notice that many of the most contemporary versions use carbon fiber. 

Carbon fiber is not only elegant, simple, and trendy, but it is also quite good at blocking magnetic fields. When the metal is organized in a Faraday shield, also known as a Faraday cage, this fact becomes much more true.

This device, named after Michael Faraday, an English physicist who developed the cage in 1836, is very helpful. 

Carbon fiber wire strips will be woven together to create a flexible cloth by manufacturers. This “fabric” is usually sandwiched between two attractive materials, such as leather in a wallet.

Any magnetic waves transmitted to the wallet will bend when the wires are woven together. 

Any energy emitted by RFID readers will be absorbed by the cage, creating a reliable barrier. This technology may be found in several different goods, including laptop bags, phone covers, and more.

Another advantage of having a carbon fiber RFID-blocking wallet is that it is very durable. 

Because the metal is very heavy-duty, you’ll be able to avoid scratches and dents over time. However, other delicate things you take with you, such as your smartphone, are likely to get scratched. 

This is why a wallet with a Faraday shield interior rather than a complete carbon fiber exterior is the best option for you.

Copper Faraday Shields:

Copper is one of the higher-quality materials used to create RFID-blocking equipment, similar to carbon fiber.

It’s widely utilized since it’s great at interrupting signals while still keeping your data secure. Copper is relatively impermeable when placed in a Faraday shield, particularly at higher frequencies.

However Copper, according to many experts, is the greatest protection against high-powered RFID readers, and it also contains high-powered active antennae.

Copper is one of the most costly metals to utilize due to its durability and dependability. For some people, spending a little more money on a copper RFID-blocking piece of luggage is worth it.

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