(1) Classification by source: It can be divided into natural adhesives and synthetic adhesives.
Natural adhesives are those whose raw materials are mainly derived from nature, such as shellac, animal glue, starch, dextrin, and natural rubber.
Synthetic adhesives are adhesives prepared with synthetic resins or synthetic rubbers as the main raw materials, such as epoxy resin, phenolic resin, neoprene, and nitrile rubber.
(2) Classification by application: It can be divided into general-purpose adhesives and special-purpose adhesives. Among special-purpose adhesives, there are various types for metals, wood, glass, ceramics, rubber, and polyethylene foam plastics.
(3) Classification by bonding strength: It can be divided into structural adhesives and non-structural adhesives.
Structural adhesives are characterized by their ability to withstand large stresses regardless of the bonding location. Under static load conditions, the shear strength of such adhesives reaches 7MPa, and they also have good peel strength and fatigue strength. Non-structural adhesives cannot bear large loads and are mainly used for bonding small parts or for temporary fixation in assembly work.
(4) Classification by curing temperature of adhesives: It can be divided into room temperature curing adhesives, medium temperature curing adhesives, and high temperature curing adhesives.
Room temperature curing adhesives are those that can cure at room temperature, usually below 30℃.
Medium temperature curing adhesives are those that can cure at 30 - 99℃.
High temperature curing adhesives are those that can cure above 100℃.