HBDDE is primarily used in research and industrial settings as a flame retardant. It is applied in the production of various materials, such as plastics, textiles, and electronics, to enhance their fire resistance. This chemical helps reduce the flammability of these products, making them safer for use in environments where fire hazards are a concern. Additionally, HBDDE is studied for its environmental impact and persistence, as it is part of a group of compounds that can accumulate in ecosystems. Its application is carefully regulated to balance safety benefits with potential ecological risks.