Is Heat Insulation Window Film Useful?
2 Answers
Applying heat insulation film to car windows is indeed beneficial. The working principle and functions are explained as follows: Working Principle of Heat Insulation Film: Heat insulation films are manufactured using vacuum deposition or magnetron sputtering technology to create multiple layers of tightly packed metal films (composed of aluminum, gold, copper, silver, etc.) with high heat insulation properties. When sunlight hits the window, free electrons in the film's metal layers that aren't bound to atomic nuclei absorb some of the energy and reflect light. These metal layers reflect visible light heat energy while the film's tint absorbs solar thermal radiation, which is then re-emitted outward. This process, combined with outdoor airflow, helps dissipate a portion of the heat. Functions of Heat Insulation Film: 1. Heat and Sun Protection: The film effectively blocks significant heat generated by infrared rays. 2. UV Protection: Medium and long-wave ultraviolet rays can penetrate thick glass, but the film blocks most UV radiation, preventing skin damage and reducing interior material aging. 3. Safety and Explosion Prevention: The film's base layer is made of polyester, providing exceptional tear resistance and penetration protection. Combined with the adhesive layer, it strengthens the glass to prevent injuries from accidental breakage.
I deliver packages on the highway every day during summer. Before getting the tint, the steering wheel was so hot I couldn’t hold it, and even with the AC on max, my back was still sweating. After applying a proper heat-rejection film, I noticed the dashboard no longer feels scorching, and the AC on level two is cool enough. Most importantly, the burning sensation on my arms from the sun has significantly reduced. However, don’t cheap out and buy low-quality film—my friend tried an $80 fake one, and within six months, it faded and bubbled, even creating rainbow streaks on the windshield. Opt for ceramic film with over 70% light transmittance. Though it costs $300–500 more, the heat insulation remains stable even after five years, making long drives under the sun much more bearable.
