Adhesion promoters, or coupling agents, act as molecular bridges at the interface between a polymer and a substrate to enhance adhesion between the two materials. The type of adhesion promoters considered in this webinar are difunctional or multifunctional reactive silanes that contain both organofunctional and hydrolyzable groups. These organosilanes are applied as primers to the substrate or are added to the adhesive or sealant formulation in order to achieve self-priming adhesion characteristics. The art and technology of adhesion promotion resides in the chemical design of the adhesion promoter molecule based on its affinity for the substrate and for the applied adhesive or sealant. When formulated into an adhesive or sealant, multiple (and competing) reaction and diffusion mechanisms have a major influence on the effectiveness of the adhesion promoter. Ideally, the interfacial bridge formed by the adhesion promoter will improve the initial joint strength and prevent delamination of the adhesive or sealant from the substrate, even when exposed to water or other weathering influences. This Part 1 webinar will cover What are Coupling Agents?, Why use them as Adhesion Promoters?, Types of Organofunctional Silane Coupling Agents, Basic Silane Coupling Chemistry, Adhesion Promoting Mechanisms, Primer – the 'Go-Between' – Different Concepts