The 3M film should be laminated, that is, it needs to be constantly pressed by external force to show its adhesion. Take a corner of the waste film and tear off the inner layer, and put it between your fingers to feel it. If there is no adhesion, it is a real membrane, if it sticks to the hand, it is a fake membrane.
2. Watermark clarity
The 3M watermark on the real film has clear edges and distinct layers, while the 3M watermark on the fake film has blurred edges and unclear handwriting.
3. Wheat
After the real film is attached to the window, the lines on the surface of the film are fine and smooth from the side, and the fake film looks like dermatoglyphics and rough (this move can also be applied to other brands of real films);
4. Materials
The roller of 3M real film is made of plastic, and the roller of fake film is made of cardboard. JS painted the two ends of the cardboard with colors to imitate the plastic roller. When sticking the film, you can know the authenticity by touching the roller exposed outside the film ring (if JS is upgraded to a plastic roller, you can also refer to Method 9 and 10, hehe);
There is only "3M" on the genuine 3M film, and the logo of 3M can't be scraped off by hand, and it is smooth and has no concave and convex feeling.
Extended data:
Selection of 3M Explosion-proof Membrane
1, transparency and clarity?
This is the most important performance of automobile film related to driving safety. When choosing a film, the first thing to consider is clarity and transparency. The clarity of high-quality film can be as high as 90%, and regardless of color depth, the transparency is high and there will be no fog.
2. Thermal insulation
The main function of car film is heat insulation, so a good car explosion-proof film can reduce the temperature inside the car by reflecting infrared rays. When purchasing, customers can not only know the quality of explosion-proof film through standardized thermal insulation rate and other indicators, but also judge it intuitively, that is, use the glass with the film to block the sun and feel its thermal insulation effect with their hands.
3, explosion-proof performance
Inferior explosion-proof membranes are soft to the touch, lack sufficient toughness, are not resistant to ultraviolet radiation, and are easy to age and become brittle. Moreover, a good explosion-proof membrane will stick to the broken glass to prevent it from breaking, and the fragments will not splash and hurt people.
4. UV blocking rate
The index of high-quality membrane is generally not less than 98%, and the high one can reach 99%. The ultraviolet blocking rate is high, which can effectively prevent passengers from being exposed to excessive ultraviolet rays to burn their skin, and can also protect the car stereo and other decorations from being sunburned. However, many inferior membranes do not have this index, or are far below the standard of 98%.
Step 5 color
This is a standard that many customers care about when choosing explosion-proof membrane. The general requirement is to choose the color suitable for the car. The color of some inferior car films is easy to fade and change color, so you should not take it lightly when purchasing.