A primer is a chemical substance used to improve adhesion between two different materials. As a rule, these are materials that do not normally bond well due to different chemical or physical properties. An adhesion promoter is used to create a strong and permanent bond between these materials.

Adhesion promoters are used in many different applications. Examples of this include the production of composite materials, the coating of surfaces, the bonding of plastics or the treatment of metals. An adhesion promoter can help to improve the adhesion and therefore the strength of the bond between the materials.

There are many different types of bonding agents, each designed for specific applications. Examples of this include silanes, which are used to bond glass fibers with synthetic resins, or epoxy resins, which are used to bond metals to plastics. Choosing the right bonding agent depends on various factors, such as the type of materials to be bonded, the environment in which the bond will be used, or the desired strength of the bond.

Overall, an adhesion promoter is an important part of many industrial processes as it helps create a strong and durable bond between materials that do not normally bond well.