The viscosity and reactivity of adhesives are closely related to temperature. The viscosity of glue is measured by Brinell viscometer, and the unit is "cps centipoise". The viscosity reading of glue is generally between 300 and 30000 cps. In water-soluble adhesives, the solid content does not determine the viscosity of the glue, but the plasticizer, tackifier, etc. in the formula of the glue, which affects the viscosity value of the glue.

The adhesion of objects is realized by the pull force between the polymer in the glue. In glue, water is the carrier of medium and high molecular weight, which is carried by water and slowly immersed into the tissue of the object. When the water in the glue disappears, the polymer in the glue will tightly combine the two objects by relying on the mutual pull.