1. Transmittance: This point is more difficult to identify with the naked eye, and it is best to measure it with an optical instrument; another stupid way is to cut a small piece of the protective film to be selected and place it in the middle of the computer desktop, and then open it. A blank WORD file, check the whiteness of the area with and without film, or the whiteness of the blank WORD file in different film areas (professional point of view is called brightness). By comparing separately, the brightest material can be selected and its permeability is the best protective film.

2. Haze: The haze is mainly to be seen when the monitor is turned off. After the different protective films to be selected are pasted in sequence, the more the screen background color, the smaller the haze. Of course, this material is good. If you use a black test board, it is easier to see the difference. Another way is to turn on a fluorescent lamp in a slightly darkened room, tear off the protective film from the top and bottom of the release film, and hold it with your hand between your eyes and the light. Look carefully to see if there is a layer of mist for protection. The uniform distribution in the film is the culprit that affects the haze. The more severe the haze, the greater the haze and the worse the material. Otherwise, the better; note that the haze will affect the transmittance rate, but with Transmittance is two different concepts!

3. Static electricity: because the liquid crystal display is a sensitive device that is afraid of static electricity, the smaller the static electricity when the protective film is attached, the better. The test method is to prepare the protective film to be tested (three-layer material or two-layer material), and smoke a cigarette. Put the soot on the table top, or get some small paper scraps on the table top, then tear off the top layer of the protective film (this step is for the 3 layers), and then tear off the protective film with the silicone layer. When this protective film is used, immediately put the used layer (silica gel surface) close to soot or paper scraps to see if the protective film will absorb these things on the silica gel layer of the protective film, and whether the degree of adsorption is strong. The stronger it is, the higher the static electricity generated by the material, the worse the material, and vice versa.