Car paint protection film has strict requirements for peel force, initial adhesion, and cohesion. In terms of temperature resistance and aging resistance, most pure water-based pressure-sensitive adhesives cannot meet the requirements. At the same time, characteristics such as aging performance, the adhesion between the adhesive and the substrate, and the absence of adhesive residue also need to be taken into account.

      Compared with many other pressure-sensitive adhesive tapes, the application scenarios of car paint protection film are more complex, often facing exposure to sunlight and rain. Many of its substrates are made of highly transparent materials, and the surface of the car paint is smooth. There should be no adhesive residue when the film is removed, and these requirements are much higher than those of PVC advertising stickers.

        Peel Force: It refers to the force required to peel the adhesive layer from a standard substrate at a constant rate and angle.

      Initial Adhesion: It is the bonding strength formed by the rapid "wetting" of the pressure-sensitive adhesive to the substrate under a small pressure. It depends on the mobility of the polymer chain segments. Only when the mobility of the chain segments is strong enough to achieve good wetting with the rough surface of the substrate and reach a molecular-level contact with the substrate molecules can sufficient bonding strength be generated through the intermolecular forces. It directly affects whether construction workers can carry out repeated construction to achieve a perfect construction effect.

       Cohesion: It refers to the internal strength of the adhesive. As the adhesive of the protective film, the cohesion of the adhesive for car paint protection film must be high enough to prevent the adhesive from cracking internally and causing adhesive residue when the film is peeled off.

        Aging Performance: It is measured by the test standards of xenon lamp aging resistance performance, heat aging resistance performance, and humidity aging resistance performance.
Adhesion to the Substrate: It is the bonding force between the adhesive and the substrate, which is crucial to the overall performance of the car paint protection film.