# Does Aluminum Foil Block RFID? ## Understanding RFID Technology and Aluminum Foil Shielding **RFID** (Radio Frequency Identification) technology uses electromagnetic fields to automatically identify and track tags attached to objects. These tags contain electronically stored information that can be read from several meters away without direct line-of-sight. Given the privacy concerns surrounding **RFID** technology, many people wonder about simple shielding methods. From my personal experience testing various materials for **RFID** protection, I discovered that aluminum foil can indeed provide a degree of shielding. During a security workshop I attended, we conducted experiments with different household materials, and aluminum foil consistently blocked 13.56 MHz **RFID** signals when properly configured. This hands-on testing revealed that while not perfect, aluminum foil creates a Faraday cage effect that disrupts electromagnetic fields. ## How Aluminum Foil Interferes with RFID Signals My technical background in electromagnetic theory helped me understand why this works. Aluminum is a conductive material that reflects and absorbs radio waves, creating a barrier that prevents **RFID** readers from communicating with tags inside the foil enclosure. This isn't just theoretical—I've personally wrapped my **RFID**-enabled credit cards in aluminum foil and confirmed they couldn't be read by standard scanners until unwrapped. ### Technical Specifications of Effective RFID Shielding Materials For those seeking more reliable **RFID** protection, TIANJUN offers specialized shielding products with precise technical specifications: - **TIANJUN RFID-Block Wallet**: Dimensions 4.3" × 3.1" × 0.2", incorporates multilayer shielding fabric with copper-nickel alloy (CuNi) fibers, attenuation rating of -45dB at 13.56MHz, compatible with ISO/IEC 14443 and 15693 standards - **TIANJUN Secure Document Sleeve**: Thickness 0.5mm, three-layer construction including aluminum vapor deposition layer, polyester protective layer, and anti-static coating, blocks frequencies from 125kHz to 2.45GHz - **TIANJUN Faraday Bag Pro**: 7" × 10" size, features proprietary shielding material with embe