Does metal block RFID? In most cases, yes: a closed metal case stops a contactless reader from reaching the cards inside. But not every piece of metal works the same way, and a metal wallet is not the only way to block RFID. This guide explains how metal blocks RFID signals, whether stainless steel and aluminium work, which RFID blocking materials are used in wallets, and what to look for if you want your contactless cards kept out of reach of stray readers.
What is RFID, and why block it?
RFID (radio frequency identification) is the technology behind contactless payment cards, travel cards and many building passes. A reader sends out a weak radio signal, and the chip in the card answers when it is close enough, usually within a few centimetres. Some people worry that a reader could be used to read card details without their knowledge, so they choose a wallet or card holder that blocks RFID signals for extra peace of mind.
Does metal block RFID?
Yes, metal can block RFID signals. A closed metal case works on the principle of a Faraday cage: the conductive metal surrounds the cards and stops the radio waves from a reader reaching the chip. The key word is "closed". A card sitting against one flat sheet of metal may still be readable from the other side, while a card fully enclosed in a metal case usually cannot be read.
As with any security feature, results depend on the design, so check the product description for how a particular holder is made.
Can a metal card holder block RFID?
Yes, metal card holders can block RFID signals when they are closed. Their metallic casing creates a barrier that makes it very difficult for the signal to reach the cards inside. Once you open the holder or fan the cards out, they can be read again, which is exactly what you want when paying. For a fuller look at this question, see our guide: can a metal card holder block RFID?
Is stainless steel RFID blocking?
Metals such as stainless steel can block radio signals when they are formed into a casing or enclosure around RFID-enabled cards. Like other metals, a closed steel case acts as a Faraday cage and disrupts the signal used in RFID technology. A flat piece of steel on its own will not block a signal from every direction, so the enclosure and its construction matter more than the exact metal.
Does aluminium block RFID?
Yes. Aluminium is one of the most common materials in metal card cases because it is light, conductive and easy to shape. A closed aluminium credit card case blocks RFID in the same way as steel. Even kitchen foil wrapped fully around a card will usually stop it being read, which shows that it is the enclosure, not the thickness, that matters.
RFID blocking material: metal is not the only option
Many modern wallets block RFID without a solid metal shell. Instead, they use a thin RFID blocking layer, usually a metallised fabric or foil lining, built into the card slots. This gives the same blocking effect while keeping the wallet slim, light and flexible. Common RFID blocking materials include:
- Aluminium or stainless steel cases: rigid and durable, but heavier and bulkier.
- Metallised linings: thin conductive fabric inside leather or carbon fibre style wallets.
- Blocking sleeves: card-sized sleeves you slip a single card into.
Our carbon fibre style RFID card wallet and RFID card holder with coin pocket use a built-in RFID blocking layer rather than a solid metal case, so they stay slim enough for a front pocket. If you carry notes too, the RFID money clip wallet combines blocking card slots with a clip for cash.
Why choose a metal card holder?
The main reason people buy one is the RFID blocking effect. Beyond that, a metal card holder keeps cards flat and guards them against bending, as it is usually made from hard-wearing aluminium or stainless steel. Metal holders are typically compact and slim, easy to carry in pockets or small bags, and many have a pop-up or push-button mechanism for quick card access.
The trade-offs are weight, a hard edge in the pocket and limited space for notes and coins. If you want more flexibility, a slim wallet with an RFID blocking lining is often the better everyday choice. Our guide do RFID wallets really work? compares the options.
How to check that your wallet blocks RFID
Put a single contactless card in the wallet, close it and hold it flat against a card reader, for example at a ticket barrier or a self-checkout. If the reader does not respond, the blocking is working. Test each slot you use, as some wallets only block in certain pockets.
Questions and answers
Does metal block RFID?
Yes, when the metal fully encloses the card. A closed metal case acts as a Faraday cage and stops the reader's signal reaching the chip.
Do metal wallets keep credit cards safe from scanning?
A closed metal wallet stops contactless cards being read while they are inside. It does not stop other types of fraud, so keep normal care with your cards and PINs.
Does a metal case stop credit cards being read?
Yes, a closed aluminium or steel case stops most contactless readers. Once you open it, the cards can be read again.
Does stainless steel block RFID?
Yes, if it forms a closed case around the cards. A single flat sheet of stainless steel is not enough on its own.
What material blocks RFID in a wallet?
Aluminium, stainless steel and thin metallised linings all block RFID. Most slim wallets use a lining so they stay light and flexible.
Can I still pay contactless with an RFID blocking wallet?
Yes. Take the card out, or open the wallet, and pay as normal.
Shop RFID wallets and card holders
Compare slim designs in our RFID blocking wallets for men and men's card holders.
Orders are normally dispatched within 24 hours, with free UK delivery, 60-day free returns and a lifetime manufacturer's warranty.
Leave a comment
All comments are moderated before being published.
This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.