Carbon does not fade, does not block signals, and rejects more infrared than dyed film. Ceramic particles (often non-conductive nanoceramic) provide the highest heat rejection currently available without signal interference. It's a multi-layered film built around microscopic carbon particles infused directly into the polyester base. Older dyed films add color on the surface — like painting over a wall. Carbon films build the. Window film is a thin laminate applied to glass surfaces, primarily to manage the amount of light, heat, and UV radiation entering a vehicle or building.