Heat insulation performance: You can use professional heat insulation test equipment or expose the glass with window film to the sun for a period of time, and then feel the temperature of the glass surface with your hands. The heat insulation effect of genuine nano-metal window film is obvious, which can effectively block heat transfer and make the temperature of the glass surface significantly lower than that of unfilmed glass. If the heat insulation effect of the window film is not good, it may be a counterfeit product.
UV blocking rate: Use a UV test card or UV lamp to test the UV blocking rate of the window film. Place the test card behind the glass with the window film, and then illuminate it with a UV lamp. If the color on the test card does not change or changes very little, it means that the window film has a high UV blocking rate; on the contrary, if the color on the test card changes significantly, it means that the window film has a low UV blocking rate and may be a counterfeit product.
Light transmittance: According to relevant standards, the light transmittance of automobile front windshield films shall not be less than 70%. Observe the light transmittance of the window film in a well-lit place. The light transmittance of genuine nano-metal window films is high and will not affect the vision. The view from inside the car to the outside is clear and natural; while the light transmittance of counterfeit products may be lower, which will blur the vision.
Conductivity test: Nano-metal window film contains metal components and has a certain degree of conductivity. You can find the edge of the window film and gently slide it on the phone screen. If it is a metal film, the screen will move with the film; if it is a ceramic film or ordinary film, there will be no reaction.
