First, look at the haze
1. How to see the haze of the PE protective film? First of all, look at the display with the monitor turned off. The method is the same as the above. After the protective films are sequentially opened, the more the haze of the screen background, the smaller the haze. The smaller the material, the better. If you use a black test board, the difference will be easier to see.
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, and then hold it between your eyes and the light with your hand. Check carefully if there is a layer of mist. Evenly distributed in the protective film, that is the culprit that affects the haze. The more serious this kind of haze is, the larger the haze is, the worse the material is, and the better it is; otherwise, the haze will affect the transmittance rate. , But is different from 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 is, the better, when the protective film is applied. The test method is to prepare the protective film (3 layers or two layers) to be tested, and smoke a cigarette and hit the soot on the table. Or put a little paper scraps on the table, and then peel off the top layer of protective film (this step is required for 3 layers), and then peel the protective film with silicone layer, and remove this protective film. Immediately use the layer (silica gel surface) close to the soot or paper scraps 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, the better it is.
Third, look at scratch resistance
1. Whether the protective film is scratch-resistant or scratch-resistant is the most important issue for everyone at present. The scratch-resistant materials on the market are basically the same (2-3H), and the performance is also good. There are only scratch-resistant and non-scratch-resistant. The test method is to use a pencil with a hardness of 3H and push it away on the PE protective film 10 times with a 45 degree angle and 500G force. If there is no scratch, it is considered that it can reach the 3H hardness requirement.
2. There is also a simple method, which is to use a slightly hard metal device or newly cut nails to scrape the normal stylus on the pe protective film surface. The simple method is to use a slightly harder metal device or new cut The nails are scratched with the strength of the stylus on the surface of the material. If it is very easy to scratch, it is considered that it is not scratch-resistant. If there is no scratch, it can be determined that it has anti-scratch function.
Fourth, look at the transmittance
This point is difficult to identify with the naked eye. It is best to use optical instruments to measure it. A simpler method is to choose a protective piece of each protective film and place it on the computer desktop one by one, and then put it on the computer. Create a new blank WORD file and check the whiteness of the blank WORD file on the computer with or without film or in different film areas (professional point is called brightness). By comparing them separately, you can choose the brightest material whose transmission is the best protective film.https://www.pe-protectionfilm.com/