In service conditions, glue and sealing glue should be used in a certain environment, and the working conditions have an important impact on the bonding performance. In the use conditions, there are stress conditions, ambient temperature and humidity, chemical media conditions, outdoor conditions, etc. When the adhesive is subject to peeling force and uneven pulling force, the adhesive with good toughness can be selected, such as rubber glue, polyurethane glue, etc; When subjected to uniform pulling force and shear force, adhesives with higher hardness and strength can be selected, such as epoxy adhesive and acrylate adhesive.

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.