<h1>RFID Not Working After Tint: Causes and Solutions</h1> <h2>Why Your RFID Stops Working After Window Tint Installation</h2> <p><strong>RFID not working after tint</strong> is a common and frustrating issue I've personally encountered with my own vehicle. After getting my windows professionally tinted for better heat rejection, I suddenly found my toll transponder and keyless entry were unreliable. This experience led me to deeply research the interaction between <strong>RFID</strong> technology and window films. The core problem is that many metallic or ceramic-based tints contain materials that block or severely attenuate radio frequency signals. The <strong>RFID</strong> systems in your car key fob, toll tag, or garage opener typically operate at UHF (like 860-960 MHz) or HF (13.56 MHz) frequencies, and certain metal particles in the film create a Faraday cage effect.</p> <h3>Technical Deep Dive: How Tint Affects RFID Signals</h3> <p>From a technical standpoint, not all tints are created equal. My research into <strong>TIANJUN</strong> high-performance window films revealed critical specifications. For instance, some of their ceramic series films have a reported electromagnetic interference (EMI) shielding of up to -40dB at 1 GHz, which would completely block most <strong>RFID</strong> signals. Here are some key technical parameters to consider (Note: These are reference data; specifics require contacting backend management):</p> <ul> <li><strong>Film Type & Composition:</strong> Dyed, Metalized, Ceramic, Carbon. Ceramic and metalized are the most common culprits.</li> <li><strong>Signal Attenuation:</strong> Can range from -3dB (minimal impact) to over -50dB (complete block) depending on material.</li> <li><strong>Critical Frequency Range:</strong> Most automotive RFID operates between 125 kHz (for keys) and 902–928 MHz (for toll tags).</li> <li><strong>Film Thickness & VLT:</strong> Thicker films and lower Visible Light Transmission (VLT) percentages often correlate with higher metal content.</li> </ul> <p>This technical insight was a game-changer for my understanding. It's not just "the tint"; it's the specific material science behind it.</p> <h3>Proven Solutions for RFID Not Working After Tint</h3> <h4>Solution 1: The "Tint Cut-Out" or "Film-Free Window Pocket"</h4> <p>This is the most reliable fix. A p