Processing and application of composites A complex system of plastics, glass and other fibres and other additives can be used to create composites that can be used to make components and end products for the automotive, construction, electrical and electronics industries, as well as other areas such as medicine and wind energy, sports and leisure. Today, the use of composite parts, which can be used as a substitute for metals and are subject to high physical stress, is growing rapidly, particularly in the aerospace and automotive industries.