When producing composite materials made from glass it is crucial to modify the surface of the fibers with sizing agents after they are produced from the melt. This step chemically alters the fiber surface, making it coupling-capable. This enables organic polymers to bond to the fibers. Silanes such as DYNASYLAN® act as adhesion promoters within the sizing, ensuring that the fibers bond effectively to the matrix, thereby increasing the mechanical strength and durability of the finished composite material.
Manufacturers of sizing agents can choose between two types of silane products: water-based silanes do not release alcohol into the sizing and are ready-to-use. Alkoxysilanes oligomerize in water while releasing alcohol to form the reactive product that is incorporated into the sizing. A convenient solution is using HYDROSIL® materials, which contain the reactive product from the start. They also offer advantages for occupational safety as they do not release alcohol, resulting in reduced odor and a safer working environment.