the method of distinguishing the authenticity of the car film is as follows: 1. Regular brand car films have anti-counterfeiting watermarks and car film quality assurance cards. 2, you can take a small piece of car film, tear open the transparent layer and smell it. The fake film usually has a pungent smell, but the real film does not. The following information is relevant: 1. Take the front barrier film as an example, the light transmittance of slightly better car film is above 7%, the ultraviolet resistance is between 98% and 99%, and the heat insulation rate is above 48%. For side windows and rear gears, the light transmittance of the selected car film only needs to be above 6%. Choose good quality car film for the whole car film, of course, the actual price of different brands is still different. 2, judging the quality of the car film can also be judged by hand feeling. The high-quality film feels thick and smooth and has enough toughness. The inferior film, on the other hand, is easy to wrinkle and thin and soft. If you can't feel the quality of the film by hand, the owner can take a small piece of film and scratch it on the glass. If the film is easy to leave marks or rupture, it means that this kind of film is inferior, so don't choose it.