How is the viscosity level of A4 adhesive divided?

The classification of adhesive grade for A4 stickers is mainly based on the viscosity of their adhesive. Generally speaking, the viscosity grade of self-adhesive adhesives is represented by numbers or other classification methods, with different numbers or classifications representing different viscosity sizes and applicable ranges. The following is a common classification method for the adhesive grade of A4 stickers:

1.Low viscosity: This type of adhesive has relatively low viscosity and is commonly used to adhere materials such as paper with smooth surfaces. The specific viscosity grade numbers (such as 4, 3, etc.) may vary depending on different manufacturers and testing standards.

2.Medium viscosity: Medium viscosity stickers are suitable for adhesion to various surfaces, especially for specific printing processes such as screen printing, gravure printing, heat transfer printing, etc. Its viscosity level numbers may include 6, 8, etc.

3.High viscosity: High viscosity stickers are suitable for adhering rough surfaces, such as plastics, metals, and other materials. The adhesive grade numbers for this type of sticker may include 10, 12, etc.

4.Ultra high viscosity: Ultra high viscosity stickers have extremely strong adhesion and are suitable for harsh environments, high adhesion, and heavy load areas. Its viscosity level numbers may include 15, 20, etc.

In addition to the number based classification methods mentioned above, the stickiness of stickers may also be described through other classification methods, such as Ultra removable, Removable, Permanent, and High tac. These classification methods may have taken into account factors such as the usage scenarios, installation difficulty, and cleaning difficulty of stickers.

When choosing A4 adhesive, in addition to considering its adhesive grade, other factors need to be taken into account, such as the material, color, thickness, and water resistance, oil resistance, wear resistance, and other performance requirements of the adhesive layer. At the same time, different application scenarios and purposes may also have different requirements for the adhesive grade of stickers. Therefore, when choosing A4 stickers, it is recommended to choose the appropriate adhesive grade and type based on specific usage needs and scenarios.

Overall, the classification of adhesive grades for A4 stickers is a relatively complex process that requires consideration of multiple factors and conditions. When choosing, it is recommended to consult professional adhesive manufacturers or suppliers for more accurate and detailed advice and information.