General manual adhesive to determine the quality of pressure sensitive adhesive quality, can be measured from the adhesion strength, drying speed, viscosity, solid content and PH values.

Solid content:
Solid content is also one of the important factors that affect the quality of pressure sensitive adhesive. The higher the solid content, the stronger the adhesion and the faster the drying speed.

pH:
Synthetic resin adhesives are mostly weakly acidic and will not have a negative impact on the bonding process. However, water glass and starch adhesives are more alkaline, and the high alkalinity not only corrodes operators and equipment, but also sometimes corrodes the adhesives, forming spots that affect the appearance. Therefore, when purchasing adhesives, the impact of pH on the product should be considered.

Adhesion strength:
Pressure-sensitive adhesive must first have sufficient bonding strength to ensure the normal use of the bonded object. To determine whether the adhesive adhesion strength is qualified, two pieces of adhesive material can be torn along the adhesive interface. If it is found that the adhesive material is damaged after tearing, the adhesive strength is proved to be sufficient; If only the adhesive interface is separated, it indicates that the adhesive strength is insufficient.

Viscosity:
Viscosity is the most important factor affecting the quality of adhesives. If the viscosity is too large, the coating is thicker, the amount of adhesive consumption is larger, and the drying is slower. It will also affect the wetting and penetration of the adhesive on the surface of the adhesive, which will directly affect the adhesion strength. If the viscosity is too small, the coating is thin, too fast to dry, and it is prone to poor adhesion.

Dry speed:
When purchasing pressure sensitive adhesive, it is necessary to measure whether the drying speed matches the bonding process. The general manual bonding process is slow and requires a long initial dry time; The machine bonding process is very fast, requiring a short initial dry time. For dry time, the vast majority of cases require that the sooner the better so that you can enter the next process as soon as possible.