Basic Classes of Adhesive

Abstract

The term ‘Structural Adhesive’ covers many basic chemical classes of adhesives. Also, within chemical classes there may be both structural and non-structural adhesives, e.g. not all polyurethane adhesives are structural; some are sealants having some adhesion characteristics. As such, information is restricted to those types of adhesives used, or promoted for use, in structural applications. In some cases, the dividing line between sealant and adhesive becomes ‘blurred’. For example; silicone-based materials may be used as adhesives or as sealants. In many applications, the ability of an adhesive to also ‘seal’ a joint against the environment is an important advantage, avoiding leakage or crevices where corrosion could occur.