Let's take a look:
Step 1: Look at the static electricity
Since the liquid crystal display is sensitive to static electricity, the static electricity is as small as possible when the protective film is attached. The test method is to prepare a protective film to be tested (3 layers or two layers of material), and smoke a cigarette to ash on the table. Or get some fine paper scraps on the table, then remove the protective film on the top layer of the protective film (this step for the 3-layer material), then tear off the protective film with the silicone layer and tear off the protective film. Immediately use the layer (silicone surface) to get close to the soot or paper dust, and see if the protective film will adsorb these things onto the silicone layer of the protective film. The stronger it is, the higher the static electricity generated by this material is, the worse the material is, and vice versa.
Step 2: Look at the transparency
This is difficult to identify with the naked eye, it is best to use optical instruments to measure, and a simpler method is to select each protective film and cut a small piece into the middle of the computer desktop one by one, and then on the computer Create a blank WORD document and check the extent of the film and the unfilmed area on the computer or the blank WORD file in different film areas (professional point is called brightness). The contrast is the brightest material, and the transparency is the best protective film.
Step 3: Look at the haze
1. How to look at the haze of PE protective film? First of all, look at the situation when the monitor is turned off. The method is the same as above. After each protective film is pasted in turn, the haze of the screen color is smaller, and the haze is more. The smaller the description, the better the material. If you use a black test board, it is easier to see the difference.
2. Another method is to open a fluorescent lamp in a slightly dark room, remove the protective film from the upper and lower film, and hold it between the eyes and the light. Look carefully if there is a misty thing. Uniform distribution in the protective film, that is, the culprit affecting the haze, the more serious the foggy thing, the greater the haze, the worse the material, the better the explanation; (note that the haze will affect the penetration rate) But with the transmission rate is two different concepts!)
Step 4: Look at the scratch
1. Whether the protective film is scratch-resistant or scratch-proof is the most concerned issue for everyone. At present, the scratch-resistant materials on the market are basically the same (2-3H), and the performance is also good. Only scratch-proof and scratch-free. The test method is to use a hardness of 3H pencil to push the pe protective film 10 times at a 45-degree angle of 500 G. Without scratching, it is considered to be 3H hardness requirement.
2, there is a simple method, is to use a little hard metal device or a new cut nail on the pe protective film surface with the strength of the usual stylus, the simple method is to use a slightly hard metal device or new scissors The nail is scraped at the level of the stylus of the material at the use surface of the material. If it is very easy to scratch, it is determined that it is not scratch-resistant, and it can be determined that it has a scratch-proof function without scratching.