Generally speaking, car films are made up of multiple layers of coatings to achieve shielding of various light radiation. Among them, the metal insulation layer is mainly used to enhance the tension (pressure resistance, destructive power) of its film, not every film has it. The lowest end explosion-proof film is a dyeing film, which uses special colored pigments to avoid glare, so it can only isolate glaring light but cannot insulate.

　　For the issue of whether low-priced explosion-proof films will block GPS signals, we conducted a test on 5 films in the price range of 500-4000 yuan. We observed the GPS system's ability to search for stars at the same time and location. Our conclusion is that the quality of the explosion-proof film is mainly due to the technology used, and it does not mean that cheap film will affect the signal. So does the high price of car film have no impact on GPS satellite signals? The answer is negative. It may have an impact on the original car navigation signal, mainly due to the vehicle model. Some old Japanese car manufacturers choose low-cost navigation products to save costs. The GPS signal receiving antenna of this navigation is designed to be very short and small. Even without a film, the GPS signal may be unstable due to weather or geographical location. This type of car, after being coated with a metal film, blocks out a portion of the signal, resulting in the inability to receive GPS signals properly.

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