1. Adhesion

The 3M film should be a pressure-adhesive membrane, that is, it needs constant pressure from an external force to show adhesion. You can 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 stickiness, it is a real film; if it is sticky, it is a fake film;

2. Watermark clarity

The small 3M watermark on the real film has clear edges and clear outlines, while the 3M watermark on the fake film has blurred edges and unclear writing;

3. Texture

Real film window stickers When viewed from the side with backlight, the texture on the surface of the film is delicate and smooth, while the fake film looks like skin-like textures and roughness (this trick is also applicable to real films of other brands);

4. Material

The roller of the 3M genuine film is made of plastic, while the roller of the fake film is a cardboard tube. In order to simulate it, JS painted both ends of the cardboard tube to fake a plastic roller. When applying the film, you can tell its authenticity by touching the roller exposed outside the film ring (if any JS has upgraded to a plastic roller, you can also refer to methods 9 and 10, hehe);

There is only "3M" on the genuine 3M film, and the 3M logo cannot be scratched off by hand. It is smooth and has no uneven feeling when touched.

Extended information:

Selection of 3M explosion-proof film

1. Transparency and clarity?

This is the most important issue in automotive film The most important performance for driving safety. When choosing a film, you must first consider the clarity and transparency. The clarity of high-quality films can be as high as 90, and regardless of the color, the transparency is very high, and there will be no fogging.

2. Thermal insulation

The main function of car film is to insulate from heat, so a good car explosion-proof film can reduce the temperature inside the car by reflecting infrared rays. When purchasing, in addition to using standardized indicators such as heat insulation rate to understand the quality of explosion-proof film, customers can also use an intuitive method to judge it, that is, use filmed glass to block the sun and feel the insulation with your hands. Thermal effect.

3. Explosion-proof performance

Inferior explosion-proof film feels very soft, lacks sufficient toughness, is not resistant to ultraviolet radiation, and is prone to aging and brittleness. A good explosion-proof film will stick to the broken glass if it is broken, and the broken pieces will not fly and hurt people.

4. Ultraviolet blocking rate

This indicator of high-quality film is generally not less than 98, and can reach 99 as high as possible. The high ultraviolet blocking rate can effectively prevent occupants from being exposed to excessive ultraviolet rays and burn their skin, and can also protect interior car audio and other decorations from being damaged by the sun. Many inferior membranes do not have this indicator, or are far below the 98 standard.

5. Color

This is a criterion that many customers are very concerned about when choosing explosion-proof film. The general requirement is to choose a color suitable for their car. The color of some low-quality car wraps is easy to fade and discolor, so you should not take it lightly when purchasing.