First, look at the haze
1. How do you see the haze of the PE protective film? First of all, it must be seen when the monitor is turned off. The method is the same as above. After the protective films are posted in sequence, the more the background color of the screen is, the smaller the haze is and the more haze is The smaller the better the material, the easier it is to see the difference if you use a black test board.
2. Another method is to turn on a fluorescent lamp in a slightly dark room, remove the protective film from the upper and lower release films, hold it between your eyes and the light with your hands, and carefully see if there is a layer of fog Evenly distributed in the protective film, that is the culprit that affects the haze. The more serious this kind of fog, the greater the haze, the worse the material, otherwise the better; (note that haze will affect the permeability rate) , But two different concepts are related to transmittance!)
Second, look at static electricity
Since the liquid crystal display is a sensitive device that is afraid of static electricity, the smaller the static electricity when attaching the protective film, the better. The test method is to prepare the protective film to be tested (3-layer material or two-layer material). Or get some small paper scraps on the desktop, then tear off the top protective film of the protective film (this step is for 3 layers of material), then tear the protective film with silicone layer, and tear off this layer of protective film Immediately, use the layer (silica gel surface) close to the soot or paper dust to see if the protective film will adsorb these things to the silicone layer of the protective film and whether the degree of adsorption is strong. The stronger it is, the higher the static electricity generated by this material is, the worse the material is, and the better the opposite.
Third, look at scratch resistance
1. Whether the protective film is scratch-resistant or scratch-resistant is the most concerned issue. At present, the scratch-resistant materials on the market are basically the same (2-3H), and the performance is also good. The test method is to use a pencil with a hardness of 3H, and push it away on the PE protective film 10 times at a 45 degree angle of 500G. If there is no scratch, it is considered to reach the 3H hardness requirement.
2. There is also a simple method, which is to use a bit hard metal device or newly cut nails to scratch on the pe protective film surface with the strength of the usual stylus. The simple method is to use a slightly harder metal device or new cut The fingernails of the material are scratched with the strength of the stylus pen at the time of use. If it is very easy to scratch, it is deemed not to be scratch-resistant, and if there is no scratch, it can be determined that it has anti-scratch function.
Fourth, look at transparency
This is difficult to recognize with the naked eye. It is best to use an optical instrument to measure it. A simpler method is to select a small piece of each protective film and place it in the middle of the desktop of the computer. Create a new blank WORD document and check the degree of whitening of the blank WORD file on the computer with and without film or in different film areas (professionally called brightness). By comparing them, the brightest material can be selected, and its transparency is the best protective film.