Glass has always been used in façades due to its transparency, which provides aesthetics and enables interaction between the indoors and outdoors, whilst facilitating occupant benefits such as daylight and energy efficiency systems. However, the bonding adhesive, weatherseal or insulating glass secondary seals are not both transparent and durable, which limits the overall transparency of a façade. Customers have repeatedly requested crystal clear durable Si linear bonding technology for this kind of application. Based upon more than 10 years of development, the latest generation of reactive hotmelt silicone technology combines both aesthetics and performance. This presentation reviews the main characteristics and improvements of this new generation material compared to the previous versions. It also demonstrates the suitability of the silicone for the targeted applications.