Silane coupling agents belong to a class of organosilane compounds having at least two reactive groups of different types bonded to the silicon atom. One of the reactive groups of different types(ex. Methoxy, ethoxy and silanolic hydroxy groups) is reactive with various inorganic materials such as glass, metals, silica sand and the like to form a chemical bond with the surface of inorganic material while other of the reactive groups(ex, vinyl, epoxy, mrthacryl, amino and mercapto groups) is reactive with various kinds of organic materials or synthetic resins to form a chemical bond.

As a result possessiong these two types of reactive gropus, silane coupling agents are capable of providing chemical bonding betweeen an organic material and an inorganic material.