The main use of black fiberglass tissue is in the reinforcement of composite materials, particularly in the manufacturing of reinforced plastics and thermosetting resins. It is used in the production of various products such as automotive parts, electrical insulation, and construction materials due to its high strength, heat resistance, and chemical stability. Additionally, black fiberglass tissue is valued for its non-conductive and non-magnetic properties, making it suitable for applications where these characteristics are essential.